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      04-28-2021, 07:40 PM   #1
jjgrizz73
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Rear tires on 21s

I know most people run 305/25 21s which is what I have currently. I was wondering if anyone is running 325/30s ? I realize there's about an inch difference in diameter so wondering if it's even possible. Possibly even changing fronts to a 265/35?

Reason I'm asking is there's more choices in that size and a 30 sidewall would be nice for the roads here.
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      04-29-2021, 11:22 PM   #2
brad850csi
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A lot of people have been running 325/25r21 which still has a slightly taller sidewall than your current 305. I doubt a 30 will work at all unless you cut down to 285/30r21 or maybe 295/30r21 but your front will need to be a 265/35r21 with those options.

How wide are your wheels and what offset? Based on that pic they look like 11" or 11.5" and around 20mm I think?
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      04-30-2021, 09:45 AM   #3
jjgrizz73
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Quote:
Originally Posted by brad850csi View Post
A lot of people have been running 325/25r21 which still has a slightly taller sidewall than your current 305. I doubt a 30 will work at all unless you cut down to 285/30r21 or maybe 295/30r21 but your front will need to be a 265/35r21 with those options.

How wide are your wheels and what offset? Based on that pic they look like 11" or 11.5" and around 20mm I think?
They are 21x11 30 offset I bought that were originally on a m5. I'm using 12mm spacers and running the 305/25. I was looking for the 325/25 however the choices are slim and the 4s are back ordered unfortunately.

I still have my stock 20s I may just use if I visit the track and put a good rear tire on it
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      04-30-2021, 07:19 PM   #4
brad850csi
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With those spacers you'll be able to run 325/25 just fine, that is the same effective offset that I'm running

https://www.6post.com/forums/showthr...hlight=ferrada

I still think if you want to run a 30 profile you'll need to go down a bit in width
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      05-05-2021, 09:40 PM   #5
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Quote:
Originally Posted by brad850csi View Post
With those spacers you'll be able to run 325/25 just fine, that is the same effective offset that I'm running

https://www.6post.com/forums/showthr...hlight=ferrada

I still think if you want to run a 30 profile you'll need to go down a bit in width

FYSA, a 325/30/21 is far too tall for the M6 and it can cause significant damage to the ECU, Transmission, and Suspension.
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      05-10-2021, 10:31 PM   #6
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I ran 265/35/21 on the fronts and it seemed ok. I don't remember getting any rubbing but it the tire was pretty darn close to the suspension. I ran 305/30 on the rears, so sorry I don't have any input on that.
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