In Reply to: Sport wheels/ rough ride---help! posted by Jolly on January 26, 2000 at 10:57:56:
: I recently replaced my 15" stock rims with 17" Cross Spoke rims on my 97' non-sport E39. The ride is very rough on even highways. I drove a 540i Sport 99' yesterday with the same wheels on it and the ride was very good. Not harsh at all. The dealer checked my struts and said they were fine. I have come to the conclusion that I might need to upgrade the struts and springs for a smoohter ride. My PSI is 33f/35r. Also, car is very unforgiving on slight humps in the road. It pulls harshly when I go over a small hump. Any ideas of what I can do using after market products or OEM parts would be GREATLY APPRECIATED!!!!!!!!!
I may have responded to you earlier or similar post...First of all, you've done a Plus 2 set-up, so significant "visceral" reaction is expected. Secondly, if you've done this with the Sport's 235-45-17s, you're actually running a shorter tire (overall) than your stock 15s, and therefore are running 17s that are shorter than you "should" (if you have not lowered the car per the sports, etc. I'd put 245-45-17s all around and get at least some of the such back. Ideal Non modified 528 17" setup is with the 540's 8 and 9 inch (front and rear) stagger but with 225-50-17 MXX3 or XGTZ4 fronts, 245-45-17 rear for a TRUE Plus Two set up to your stock 15s. Or if you're mostly just looking for "looks" of teh 17s on your 8s all around..go with the 225s all around. Yeah, they're jsut as "skinny" as the stock 15s (or 225-55-16 Premium package) but the "side" look will be better than your 15s or 16s--and what MOST folks with 17s appreciate the most. 225-17s will give you quicker response than Plus One 225-55-16s also, but not gargantuan diff. Note also, that in addition to harsher than necessary ride on nonLowered car, the 528 Sport tires (235s) will not fill up the wheelwells visually so it wil appear you're riding on too-small tires. G the 225 and/or 245 route. (Type or Style 5 wheels finally avaialbe in 9" (like the 540 S) for rear for a nice stagger set up. Good luck.