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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Wheels and Tires -- Sponsored by The Tire Rack > Tyres 101
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      01-26-2021, 09:32 AM   #1
MotoMoto
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Tyres 101

Hey guys 'n gals,

I thought I understood most car things to a decent level, but then tyres...

I just read the sticky from the sponsors, but can you guys confirm I'm understanding it right.

Just took ownership of a 2015 330d F31 xDrive M Sport - Hurrah! - and have been doing some research and reading on the foibles of the Drive system. Checking my tyre sizes to see what the PSI should be, I spotted I had what I thought was 2 different sizes on the car.

Front 225/40R19
Rear 255/35R19

Up until about 20 mins ago, I always thought the 2nd figure was a mm measurement of the sidewall. But have I read correctly, that it's a ratio of the width to height? So essentially, these are the same profile tyres, and I don't need to worry about my xDrive transfer box exploding

As an aside, I thought from my reading that the xDrives didn't come with staggard wheels.
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      01-26-2021, 10:09 AM   #2
alohasurftoad
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Bmw offers staggered wheels/tires on all of their series and models with x-drive.

225/40/19-255/35/19 is OEM size combo on F3/4 series including x-drive.
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      01-26-2021, 12:21 PM   #3
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Is that right? I clearly need to do a little more homework.

Thanks for the heads up Surftoad.
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      01-26-2021, 01:28 PM   #4
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I suggest you start with a google search on how to read tire specs and go from there.

https://www.goodyearautoservice.com/...ll%20will%20be.
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      01-27-2021, 07:11 AM   #5
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Quote:
Originally Posted by thejeremyman9 View Post
I suggest you start with a google search on how to read tire specs and go from there.
.
I didn't know I needed to, until yesterday I had honestly gone 46 years thinking the second number was a height measurement.

Thanks for the link, really useful and clear. I consider myself learned.
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