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      09-27-2017, 08:52 PM   #14
mtnbkr
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Drives: '06 IB Z4MC
Join Date: Nov 2014
Location: Ontario, Canada

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I'm glad the OP was able to find the size for their setup but does anyone have actual experience with 255/40R18 as a square fitment on 9.5" rims? It irritates me if my speedo is under-reporting and while a 40 profile results in the same OD as original I'm unsure if it'll rub with a mild (~1/2") drop. Yes I realize a 35 profile may have slightly better feel and better for torque but it's also worse at handling rougher roads? and greater speedo error!

I like that the 255 tread width (for the MPSS tire) matches the 9.5" rim which is why I'd like to stick with that size.
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