Quote:
Originally Posted by mjsmith9s
I have a 3.0si with the m sport suspension. Stock. I have some wheels that are off of a z4m. They are:
Front: 19x8.5 et30
Rear: 19x8.5 et25
From what I gather the et25 for the rear wheels will be the biggest problem?
They ran 235/35/19 tires on front and 275/30/19 on rear for their m. I was thinking a 255 or 265 on rear if it's possible?
Not sure if it's possible to make it work, hopefully you all have an answer. The car is not my daily driver if that helps. Thanks for your input in advance. All these numbers are messing with my brain right now..
Thanks!
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(Hopefully others can chime in and confirm but...)
If you go 265 rear you’re want to step up to 265/35 which is pretty much same height as 275/30. So it’s really a width issue, 265 vs 275, both of which are too wide for 8.5 imo. Your wheel setup is basically a square width but different offsets.
Ideally you’d want to run a 255/30-19 square which would is good for 8.5 and maintains rolling diameter of ~25”. Only issue is 255 up front may rub but I actually think it’ll be fine if you pull the camber pins and dial in some negative camber. For the rears, the offsets aren’t ideal as they’re about 20mm lower than factory but it’s not bad. It’ll sit flush with a more aggressive stance. Plenty of folks have thrown 20mm spacers on back.
Alternatively you can step down to a 225/35 in the front without running camber but you won’t get much rim protection on an 8.5 and risk curbing the rims more. Lastly tire choices will impact things too so if you go with an aggressive summer compound you’ll have higher chance of running in rears. All seasons will be less of an issue.