| 06-14-2022, 05:33 PM | #1 |
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2018 M550i Tire diameter
Hello. Brand new to this forum and BMW's. I would like to go with a "meatier" tire, to look more like an M5 Competition. I have a 2018 M550i, with 20-inch wheels. I'd like wider tires, but not sure how to handle the overall diameter increase. Do I need to update the computer somehow? for mileage, speed, etc...Thanks for any help!
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| 06-14-2022, 07:04 PM | #2 | |
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If you want to go with a "taller" tire aka sidewall. You can easily go up 5% on the front and back. Several people have done it to prevent wheel damages. So, for example, you can go from a 35 to a 40 without issue. A few people said that actually corrected the car speedo to match GPS speed exactly. This is actually something I am looking to do as I've already bent one of my 668 wheels. If you're looking to go with a wider tire, you dont need to calculate anything. The diameter will be the same as long as you stay with the stock 20" sidewall or going up 5%. If you want M5 width you're probably looking at going aftermarket wheels to do that.
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2020 M550 / Dark Graphite / Napa Saddle Brown / DHP Pkg / Exec Pkg / Luxury Pkg / Parking Asst Pkg
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| 06-15-2022, 10:10 AM | #3 |
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Thanks so much! When you say aftermarket wheels, do you mean dropping to 19" wheels and increase the sidewall to match the existing diameter within 105%? I am looking at that option, but struggling to find the width I'm looking for. Thanks again!
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| 06-15-2022, 12:10 PM | #4 | |
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Personally I am fine with the 20" 668 wheels, but will eventually go up 5% on the sidewall so I dont end up bending them.
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