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      01-18-2011, 06:24 PM   #9
gthal
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Drives: 2018 340i xDrive
Join Date: Jul 2007
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Quote:
Originally Posted by smmmurf View Post
Actually, sidewall percentage is calculated off of the treadwidth. I.e., 35 profile is 35% of treadwidth. Therefore, it's actually a change from 3.4" to 3.9" on 245/35 vs. 245/40 which equals roughly a 13% change in sidewall height.

Also, I intend to go from PS2 to Hankook V12 Evo which has a softer sidewall than PS2 in the same profile/diamter.

Thanks for the input!
My bet is you will be much happier with ride quality by moving to the Hankooks. I was very happy with the ride with mine (19") and when I put my Michelin PA3s on for winter (and they are 18") I noticed a big drop in ride quality. Not that it's bad, just harsher and that is going from 19" to 18".

If it were me, I would stay with stock 19" size and the Hankook's and I bet you will be happy.
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