How to Read Tire Size

how to ready tire size

Have you noticed the combination of letters and numbers embossed on the sides of your tires? Have you ever wondered what they meant? Apart from tire size, this writing contains other important information about your tires. At BMW of Stratham, we think it’s a good idea for all drivers to know as much as possible about their cars. After all, you never know when that information might come in handy.
For those of you who live in Stratham, Portsmouth, and Exeter, NH, and beyond, we’ve created this brief step-by-step guide so you know exactly what those letters and numbers mean. Contact us with any questions!

Type of Tire

Take a moment to look at your tire. The first letter there is most likely a P. This indicates the type of tire that you have. The P means you have a P-Metric tire. A P-Metric tire is one that was made in the U.S. in accordance with strict passenger vehicle guidelines. If you have a light truck, your tire will have an LT. This can be found at the start or at the end of the tire size. If there is no letter at the beginning, you have a Euro-Metric tire that may have different load capacities.

Width of Tire
The three digits that follow the P in the tire size tell you the width of the tire from sidewall to sidewall and is shown in millimeters.

Aspect Ratio
Next, you’ll see a slash mark. The 2-digit number that comes after the slash mark is the aspect ratio. This tells you the height of the tire sidewall. It is a percentage of the tire’s width. For example, if your tire size starts out as P205/55, your tire’s height is 55% of its width.

Construction
The next part of the tire size describes its construction. The letter R stands for radial. Most contemporary tires are radial tires.

Wheel Diameter
The 2-digit number that comes after the R tells you the diameter of the wheel that your tire matches.

Load Index Number
Next is the Index load number. This indicates your tire’s maximum load capacity.

Speed Rating
The speed rating is the last aspect of tire size. It tells you the maximum speed the tire is capable of reaching.

Other Markings

Besides the tire size, other markings on your tires are good to know. They are as follows:

  • DOT Symbol. When you see this on your tire, it means the tire meets the Federal Motor Vehicle Safety Standards.
  • Tire ID Number. This number tells you where and when the tire was manufactured.
  • Air Pressure. The maximum pressure number tells you how much air pressure your tire can hold.
How Often Will You Need New Tires?
Now that you know how to read tire size, you should be able to tell different tires apart. So, how often will you need to look at tire size anyway? That depends on how often you need to buy tires. While lots of vehicle maintenance is done pretty regularly, replacing your tires is a little different.
That’s because it’s tough to tell how often you’ll need new tires. You could go years without getting a flat tire or you could drive over a nail tomorrow. When it comes to how long your tires last, that really depends on how you drive.
For example, an aggressive driver is going to need to replace their tires more often than someone who obeys the speed limit, takes smooth roads, and comes to a gradual stop. Since things like terrain and driver habits can impact your tires, tires can last anywhere from 35,000 to 75,000 miles.
That means your tires could last for years. However, even if your tires still look good as new, you should never go more than 10 years without replacing them.

Replace vs. Rotate Your Tires
Chances are you’ve heard the term rotate your tires. What’s the difference between rotating and replacing them? Essentially, rotating your tires means moving them from one axle to another. This is to help them wear down evenly and last longer. It’s an important part of your routine maintenance.
Whenever you bring your BMW in for service or an inspection, our service technicians will inspect the tires to see if they should be rotated or replaced. Once the tread gets too worn, they won’t bother rotating them again. They’ll recommend a new set of tires for you.

How to Tell if You Need New Tires
There are a few ways to tell if it’s time to look for new tires. The most obvious one is if you walk into your garage one morning and see that you’ve got a flat tire. Aside from that, there are a few warning signs you can look for, including:

  • Tire Pressure Monitoring Light
  • Bulging or Tearing Sidewalls
  • Worn Down Tread

Tire tread wears over time. One way you can tell that it’s severely worn is by seeing if your tires have started to look smooth or shiny. Another way is to run your hand over it. If it feels slightly smooth but you’re still not sure, there’s a quick test you can do.
The penny test is a timeless way to see how deep your tread is. Just take a penny, turn it upside down, and stick it in the grooves of your tire tread. If you can see President Lincoln’s head, your tread has gotten to the point where it’s time to look for new tires.
Schedule Tire Service with BMW of Stratham!
Now that you know what all those markings on the sides of your tires mean, you can find any of the above information whenever you need it. If you live in the Stratham, Portsmouth, and Exeter, New Hampshire, areas, don’t hesitate to call or stop by BMW of Stratham with any questions you might have about how to read tire size.
Whether you need new tires, have a flat, or believe it's time to get your tires rotated, our service center is here to help. With our team of ASE-certified technicians, your vehicle will be in good hands. They’ll help you choose the best set of wheels for your BMW and get you back on the road in little time. Contact us to learn more or schedule tire service online anytime.

 

Our Reviews

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DealerRater Sep 28, 2026

Adam is great and communicated well. Mechanic gave good video of the car and mentioned what is necessary to be done. Always great to come back to this place for service or purchase. Service overall is great and the car was cleaned in and out! Thank you, Adam and the team for the great service!

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DealerRater Sep 25, 2026

I was called promptly when car was ready. They helped me out by ordering an accessory that was not available at the dealer and had it for me when I came for service apptment.

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DealerRater Sep 19, 2026

I brought my car.in for service with a loaner car. My wife went on my behalf and was going to wait. After I needed a part which had to be ordered, my wife came home with a loaner. Adam was our service manager and he is the best!!

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DealerRater Sep 16, 2026

I always receive great treatment at Stratham BMW. Adam Silvani is the best- available, patient and professional!

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DealerRater Sep 16, 2026

This dealership is legit! Very happy with the purchase, service, and results of my most recent car detailing that they completed. I recommend Pawel as a service advisor he did a great job.

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DealerRater Sep 16, 2026

Great experience overall, timely service, professional staff, reasonable price, will certainly use their services again!

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DealerRater Sep 14, 2026

I like BMW of Stratham and would recommend Corey to help you in the service department.

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DealerRater Sep 12, 2026

Knowledgeable, friendly, informative. Listened to all our needs and met them. Kevin was extraordinary! Kell was thorough and conscientious. Both contributed to the positive experience. Kevin went above and beyond! Truly appreciate their efforts. Thank you!

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DealerRater Sep 12, 2026

Very efficient and personable service team. Pawel was great as a service advisor and communicated well.

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DealerRater Sep 7, 2026

Friendly service, I didn't have to wait long. Quick and easy. Offered a loaner vehicle.

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DealerRater Sep 6, 2026

I moved from Illinois where I serviced my BMW’s for years. The customer service there was fabulous and I was a bit nervous going to a new place after 25 years. My worries were wasted as the client service by Cory was fabulous and the work on my car was phenomenal. I had new brakes, tires rotated and my car detailed and it is like new. Thoroughly impressed!!! My new favorite place!! Thank you!!!!

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DealerRater Sep 6, 2026

Pawel always goes out of his way to make things easy and get things right.

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DealerRater Sep 5, 2026

Got the appointment I wanted and was very pleased with the service I received from everybody I dealt with

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DealerRater Sep 4, 2026

The whole team at BMW of Stratham were great, Scot and Bill went above and beyond to accommodate my schedule Thanks!

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DealerRater Sep 3, 2026

Very happy with the services performed at BMW of Stratham on my vehicles since 2011.

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DealerRater Sep 2, 2026

Excellent experience very good service and great customer service I will definitely do this again thank you very much

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DealerRater Sep 2, 2026

I came in to look for a M5 Touring. I was greeted by Eric. I was then helped by Kevin and eventually Brendan. They were all very helpful and knowledgeable. I ended up buying the car which I just came to look at. The car is amazing.

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DealerRater Aug 30, 2026

Got the appointment when I wanted it, got a loaner for the day. Special on oil change was appreciated.service Tech, Cory, was very helpful!

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DealerRater Aug 28, 2026

I was greeted with a smile Adam was great to deal with as he did the take in paperwork and then when I picked up my vehicle. I’m very happy with the surface that was provided and the positive attitude your team shows to your customers

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DealerRater Aug 27, 2026

Noah was a Professional, polite and knowledgeable service advisor. Service was scheduled promptly and completed quickly. Estimate was spot on. Communication was excellent throughout the service with updates and results.

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DealerRater Aug 26, 2026

Enjoyable doing business with them. No pressure at all. Would highly recommend this dealership to all.

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DealerRater Aug 24, 2026

Alex and the entire service team are outstanding! I keep buying these cars since the service is so amazing! Thank you!

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DealerRater Aug 23, 2026

I purchased 2025 Infiniti QX60. Fair Price, great sales guy, Steve Hazard. Excellent dealership. All smooth.

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DealerRater Aug 23, 2026

Excellent dealership, Adam in the Service Dept is very helpful! This is my 4th BMW from the dealership Very satisfied !

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DealerRater Aug 18, 2026

Responsive and clear with what my car needs and patient with my questions to be sure I understand my options.

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DealerRater Aug 14, 2026

Always great service. Very knowledgeable and courteous. My go to BMW dealer for service. I’m pleased with my service at BMW Stratham.

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DealerRater Aug 14, 2026

Great service, fast, efficient and nice location. Did not have an appointment but was able to squeeze in and get out quickly. Thanks team!

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DealerRater Aug 10, 2026

Great service for our 2021 BMW X5. Items were diagnosed and tech explained clearly with video. Repairs made promptly.

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DealerRater Aug 4, 2026

Another great service experience at BMW of Stratham. Noah was great from start to finish.

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DealerRater Aug 2, 2026

The service video show precisely what needs to be done and why. The estimates are accurate and the service is top shelf

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DealerRater Jul 30, 2026

Pricing was fair, good selection and a fantastic delivery experience. Looking forward to being a repeat customer soon.

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DealerRater Jul 29, 2026

Great dealership! Nice people, clean, good snacks, short waits for your service to be completed

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DealerRater Jul 28, 2026

Helpful, friendly and efficent service, would recommend without reservations! Easy to schedule, loaner car exquisite, great group!

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DealerRater Jul 25, 2026

Very Comfortable, Noah very helpful in Service, Car looked at pickup !! Kevin's experience in Sales, was a Pleasure to deal with and answered all my questions immediately 🙏

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DealerRater Jul 24, 2026

Scott was very helpful and went out of his way to find us the right car.

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DealerRater Jul 24, 2026

Great experience with Adam the service manager and Adam the service advisor. Very professional kept me in the loop during the whole process with a tough issue with my BMW I8

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DealerRater Jul 24, 2026

Pawel is the best in the business Always A plus Best bmw dealer in New England

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DealerRater Jul 23, 2026

Service is the best speed and professionalism is hard to find an they have both.never had to go back to correct problem, get it done the first time Len W

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DealerRater Jul 20, 2026

Pawel is an excellent service manager… service was terrific. Loved the service tech Vidio on the cars overall health..

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DealerRater Jul 15, 2026

Service advisor Cory C. is outstanding. Service is easy to schedule and the car was ready on time.

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DealerRater Jul 13, 2026

Good, friendly and professional service department that you can trust when getting work done on your BMW.

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DealerRater Jul 11, 2026

The service rep Noah was very accommodating and stopped by me about every hour to give me an update on progress and the mechanic Ken Deem was extremely knowledgeable about what needed to be fixed on my 760i. It had been in an accident and needed the electrical and suspension system checked over. No easy task!

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DealerRater Jul 10, 2026

The service and communication is always amazing. Cory who was my advisor was knowledgeable, kind and got my car done ahead of when I needed it.

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DealerRater Jul 8, 2026

The service advisor Cory at BMW of Stratham provided outstanding customer service from start to finish, keeping me informed throughout the entire process and making everything seamless and stress-free.

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DealerRater Jun 27, 2026

Welcoming and knowledgeable and no pressure. Made you feel at home. Not a pressure or

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DealerRater Jun 25, 2026

This is our second new BMW we leased in 1 month! Great communication and customer service!

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DealerRater Jun 25, 2026

Impressed with the meeting of the gentlemen within the service greeting area. Very friendly polite

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DealerRater Jun 23, 2026

Adam was a very helpful service rep who provided detailed explanations and videos to describe the service needs.

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DealerRater Jun 20, 2026

My car was repaired and I am very satisfied with that. Dealerships are very expensive. I did not use any of the BMW perks that were available, such as a loaner or pickup. I did enjoy the Military discount.

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DealerRater Jun 16, 2026

Great communication and top notch service from the team at Stratham BMW. Would highly recommend.

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DealerRater Jun 13, 2026

Susan did an excellent job and found the car I was looking for. Thanks again.

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DealerRater Jun 7, 2026

Service was excellent, easy in and out. Adam was very helpful and ensured work was done quickly

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DealerRater Jun 4, 2026

Adam & all the service staff are easy to deal with. No high pressure service selling, just common sense items.

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DealerRater Jun 3, 2026

We appreciated the attentive service for a New Jersey BMW owner. Work was performed as promised.

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DealerRater Jun 3, 2026

Excellent service . Inspection and recommendations very helpful. Done on schedule and free car wash at a great price.

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DealerRater Jun 2, 2026

I like the low-key vibe and the fact that they do not push doing repairs that are not absolutely necessary.

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DealerRater Jun 1, 2026

Steve was great! He was wonderful to work with and everyone at the dealership was professional and nice!

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DealerRater May 31, 2026

Prompt and friendly shop for service on my 24 Ineos grenadier. Has the B58 engine.

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DealerRater May 26, 2026

Great communication at every level from sales to instruction. Everyone was responsive to our questions.

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DealerRater May 21, 2026

Great service Staff is knowledgeable, friendly and provide sensible recommendations. Service is quick and efficient

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DealerRater May 20, 2026

Excellent service and communication. BMW Stratham listens and addresses all service concerns quickly and efficiently. You are sent videos of your car as well as Text/email evaluations, repair work needed and once approved, completed. I definitely would recommend BMW Stratham for Sales and Service!

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DealerRater May 19, 2026

We found you to be courteous, timely and good communicators. We will continue to do our business with you!

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DealerRater May 19, 2026

Paul as always was very friendly and professional. A pleasure. Also, Haley is always helpful even when I don’t have an appointment.

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DealerRater May 15, 2026

Customer Service with Pawel was exceptional! The technician (Chris) that worked on my vehicle was thorough and explained everything. Thank you Pawel and Chris for a wonderful experience!

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DealerRater May 15, 2026

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DealerRater May 12, 2026

Andrew and salesman weee great. Finance manager should be fired for his high pressure outright lies. Terrible time cancelling unwanted extras for his commission. Still trying to cancel one

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DealerRater May 6, 2026

Everyone always very kind, helpful and knowledgable. Great communication. Dealership is always clean. They are usually on time with car being taken in and ready.

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DealerRater Apr 30, 2026

Had a great experience at BMW of Stratham. They completed multiple service requests while I waited, and I was on my way by lunchtime. They even informed me of an open recall item that I wasn’t aware of and took care of that at the same time! That was much more convenient than having to schedule an additional visit. Our service advisor Cory was courteous and professional.

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DealerRater Apr 30, 2026

BMW of Stratham went over & an over to accommodate me picking my car up & returning it when the service was done. I highly recommend their service department!

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DealerRater Apr 28, 2026

Great service at fair price. Appointment kept on time service updates received while I waited in comfortable waiting area well stocked with complimentary beverages and snacks.

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DealerRater Apr 27, 2026

I had an excellent experience with the dealership. My prior BMW x5 was purchased new less than a year ago and was totaled by a reckless driver hitting me. The thought of buying another car was pretty stressful, but I knew to reach out to Scot Murby since I had just worked with him less than a year ago. I had a few things that were really important to me—the color, the driver-assist features, and the tow hitch—and I didn’t have the time to build something custom. Scot searched the country and was able to find a ... Read More

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DealerRater Apr 25, 2026

I am fully satisfied with your service. I always remember my BMW service technician for their extraordinary job

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DealerRater Apr 23, 2026

Excellent service and communication between service advisor and the customer. I would recommend this dealership without reservation.

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DealerRater Apr 23, 2026

I had to take my X5 in after the engine light came on due to a prior accident and repair down in Florida. I am not a previous customer but they still worked with my insurance and the original repair shop to help me get the issue resolved promptly.

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DealerRater Apr 23, 2026

The service staff is exceptional. They go above and beyond to ensure your car is well cared for and serviced properly. I trust their high level of expertise implicitly.

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DealerRater Apr 22, 2026

Nice folks and an easy to understand transaction. Great product and test drives to get a good feel for the car.

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DealerRater Apr 21, 2026

Adam and Paul are amazing! & are the reason I come to this dealership and this delarship only for repairs.

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DealerRater Apr 20, 2026

Great experience overall. All service recommendations reviewed and approved in advance of work. was able to defer some recommendations. Work completed on time and loaner car a great asset.

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DealerRater Apr 17, 2026

Great deal ship. Been working with them for years. Thx Cory for helping. Was pleased with all work. Had oil change and re-call on pump. Getting tires in 2 weeks.

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DealerRater Apr 16, 2026

once again, I am impressed by the complete professionalism of the staff at BMW Stratham, always courteous and friendly.

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DealerRater Apr 15, 2026

Always a good experience when I work with Paul in the Service Center, this time was no different

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DealerRater Apr 14, 2026

I had a very positive experience at BMW of Stratham. I stopped by near the end of the day to pick up brake parts I had ordered online, and while I was there, I checked in with the service department to get a quote for installing rear brake pads and rotors. Even though Adam Webster was about to leave for the day, he still took the time to help me. He let me know about a brake special they were running, which ended up saving me money. Since my brake light was on, I was hoping to get the work ... Read More

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DealerRater Apr 14, 2026

The service department is absolutely excellent from check in, to the service done on the car, to checkout. They suggest but never pressure. Everyone is kind, considerate, and helpful. Very professional. If your not having your service done here, your cheating yourself!

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DealerRater Apr 13, 2026

Matt does a great job of explaining all aspects of anticipated service. He always gets me in and out in a timely fashion.

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DealerRater Apr 4, 2026

Easy service. Excellent service reps. Mechanics go over entire car with video. Everything explained. Car is washed.

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DealerRater Apr 3, 2026

The people are fantastic, great inventory too. Very professional and easy to deal with both sales and finance.

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DealerRater Apr 1, 2026

Adam took great care of me when I brought my car in for service. He arranged a loaner for me and communicated to me throughout the process. Excellent service experience!

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DealerRater Mar 23, 2026

BMW of Stratham was very helpful in solving an issue with our new used vehicle.

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DealerRater Mar 22, 2026

Our sales rep Steve Hazzard was exceptional! Really great BMW knowledge and excellent people skills

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DealerRater Mar 20, 2026

BMW of Stratham really came through for me when I needed them! I was traveling from Connecticut to Dover and had a tire puncture while on I95. Not only did they arrange for a tire delivery for the very next day, but they also arranged for rides to and from my destination so I could keep my plans. Pawel communicated updates and the whole team went above + beyond to help me!

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DealerRater Mar 15, 2026

Very good customer service and efficient repair time. Also provides clear overview of the issues

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DealerRater Mar 14, 2026

The service here is always top notch very well organized, and the communication is outstanding very friendly environment

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DealerRater Mar 12, 2026

Today I had my second service experience with this dealership and it was exceptional. I’ve been a BMW customer for 30 years and have service at 10-15 different dealerships from Princeton NJ to Austin, TX to Palm Springs, CA and BMW of Stratham is, hands down, the best I’ve experienced.

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DealerRater Mar 11, 2026

Matt V ( Stratham NH BMW) was great as always. After so many years, Matt is Always flexible and with the upmost knowledge , patience and kind professionalism. Keeping me advised on my 2009 135i convertible . While the mechanics handle whatever comes their way.

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DealerRater Mar 9, 2026

Excellent service and good people. Everyone made us feel welcome and appreciated. We will recommend to others

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DealerRater Mar 7, 2026

Great service from Matt and Adam all the time since I purchased my BMW HERE!

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DealerRater Mar 4, 2026

The staff was friendly, knowledgeable, and took care of all of my service needs. I would say they went above and beyond to inspect my vehicle and make my service experience, five stars!

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DealerRater Mar 3, 2026

Matt did an outstanding job servicing my BMW.will recommend him and BMW of Stratham,NH to all in need. Thank you, David Burbine

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DealerRater Mar 3, 2026

Service was and is always helpful, timely and courteous. Would recommend them for all your needs

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DealerRater Mar 2, 2026

Gary, did an amazing job with my scheduled oil change. Polite and professional service department

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