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2Addicts | BMW 2-Series forum Technical Topics Tracking / Autocrossing Is a wider rim always better for RE71s on a stock suspension m235i?

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      10-25-2018, 04:00 PM   #1
buster-riley
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Is a wider rim always better for RE71s on a stock suspension m235i?

I am a newbie just finished my first autocross season on 225/45/17s and am will get new wheels for next year. I'd like to run 245/40/17s. Does rim width make a big difference. what rim width and ET should I buy? Thanks guys.
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      10-25-2018, 04:39 PM   #2
dradernh
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Yes, it makes a difference. You want as much tread width as possible on the pavement.

17X9 is the wheel size I would recommend for a tire with the 8.6" tread width of the 245/40-17 RE-71R.

Someone else will have to chime-in regarding offset(s).
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      11-12-2018, 05:33 AM   #3
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Quote:
Originally Posted by dradernh View Post
Yes, it makes a difference. You want as much tread width as possible on the pavement.

17X9 is the wheel size I would recommend for a tire with the 8.6" tread width of the 245/40-17 RE-71R.

Someone else will have to chime-in regarding offset(s).
You want to go as wide as possible to maximize tired width and this the contact patch. There is a great threat on this in the M2 forum:

Max rubber on the M2? https://f87.bimmerpost.com/forums/sh....php?t=1464923
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      11-12-2018, 10:35 AM   #4
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Ideally, you want to run slightly wider wheels than the tire so you get a slight stretch for maximum contact patch and less sidewall squirm. Simply bumping up the tire size without taking wheel into consideration is not smart. That said, seat time is always more valuable than anything else so if you've no funds for wheel upgrades, don't worry too much and focus on getting more practice in.
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      01-04-2019, 10:10 PM   #5
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Quote:
Originally Posted by cxp213 View Post
Ideally, you want to run slightly wider wheels than the tire so you get a slight stretch for maximum contact patch and less sidewall squirm. Simply bumping up the tire size without taking wheel into consideration is not smart. That said, seat time is always more valuable than anything else so if you've no funds for wheel upgrades, don't worry too much and focus on getting more practice in.
agree 100%. I'll also add that you get better response and feedback from this type of setup. I have run 265s and 255s on the rears and the rear axle seems more responsive when I'm running the 255s. therefore I'm more consistent with my input bc I can feel what the rear is doing more.
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      01-20-2019, 11:31 PM   #6
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For what it's worth, I'm running 245/40/17 on 17x8 wheels and am having a ton of fun with it. Stock suspension too. Agree with the other guys that a wider wheel is ideal for this tire width, but I also like having the extra grip over the 225 mm. The stiff sidewalls on the RE71r means tire response is still great.

The reason I did this is so I could get a square setup to rotate my tires easily, since I have an xdrive.

https://www.2addicts.com/forums/show....php?t=1485848
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      01-24-2019, 12:25 PM   #7
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Yes, re-71r are fairly soft sidewall tires. Pinch them onto too small a wheel and you will get tons of tire roll no matter how much pressure or camber you run.
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