Originally Posted by
fuzzy
over on e30zone ive always argued against the "unsprung weight" argument when the bufties dismiss 17" alpina reps in favour of 15"bbs alloys. the difference is 17.5kg compared to 15kg, both with tyres. "they ruin the handling" etc etc.
I agree with them not just because the bbs are a much better quality wheel. Rep's are normally made of poor alloy. But the weight of a 17" tyre with a stiff sidewall is at least 10kg's so your weight doesn't add up. The 15" wheels will make the car more nimble and not as crashy as the 17's.