Hahahaha, only 4 lbs. That might as well be 40lbs per wheel. Rotational weight is the worst enemy. How you get a set of 235/40s to clear on a stock E30 is beyond me. Those must rub everywhere, especially on a 17x9. With a 40 series sidewall, your wheels won't last long either, unless you have found public road that is glass smooth with no potholes or other imperfections. I had issues with 215/40s stretched across 8.5 inch wheels and my fenders are bigger than yours. Either you don't have any inner fender covers, or you don't give a crap.
I'll take a 225/45/15 over a 215/40/17 any day of the week. At least my wheels will be round and crack free, and have a bigger footprint as well. Not to mention the ride quality is better. The car has plenty of grip, and will beat people on R compounds in an autoX, even with the suspension geometry all screwed up because its too low. I already have people bitching that I have an unfair advantage in my race class even with the 2nd heaviest car in class that is mostly stock running street tires.
Will
I'll take a 225/45/15 over a 215/40/17 any day of the week. At least my wheels will be round and crack free, and have a bigger footprint as well. Not to mention the ride quality is better. The car has plenty of grip, and will beat people on R compounds in an autoX, even with the suspension geometry all screwed up because its too low. I already have people bitching that I have an unfair advantage in my race class even with the 2nd heaviest car in class that is mostly stock running street tires.
Will
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