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Technical Topics Wheels and Tires 245/30/20 front and 255/30/20 rear

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      08-17-2024, 04:24 AM   #1
gogs_macaulay
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245/30/20 front and 255/30/20 rear

I have a set of genuine 795m alloys that require new tyres all round

I know the stock set up is 225/35/20 front and 255/30/20 rear but wouldn’t mind more front end grip

So would 245/30/20 fronts with 255/30/20 rears work better?

Looking online 245 is max size for an 8j rim and 255 for 8.5j

Car is a 22 M340i xdrive

Cheers
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      08-19-2024, 01:36 PM   #2
FLfree
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Quote:
Originally Posted by gogs_macaulay View Post
I have a set of genuine 795m alloys that require new tyres all round

I know the stock set up is 225/35/20 front and 255/30/20 rear but wouldn’t mind more front end grip

So would 245/30/20 fronts with 255/30/20 rears work better?

Looking online 245 is max size for an 8j rim and 255 for 8.5j

Car is a 22 M340i xdrive

Cheers
I have the same question.
I use this. Front and rear have to be “1inch diameter of each other or computer will flag. Also, Speedo will be off.
I’m installing the process of getting a set of OEM 840i wheels with the same spec.
I was told that the best set up is the stock set up 225/255.
I am hoping someone more knowledgeable can chime in.
https://tiresize.com/wheel-offset-calculator/
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      09-18-2024, 01:55 PM   #3
b58monster
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Yes, running that exact 245/255 setup on my M340i with 795M. Slight decrease in turn-in responsiveness, but noticeable improvement in terms of understeer and front-end grip. No issues with xDrive, highly recommend for anyone currently on a 225/255 stock setup.
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Llarry22878.00
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