[redzed]

Right might be a tad race geeky and not interesting but it below is the weight per wheel of mk1/2 and aftermarket rims and the effects it has on your car.

Weight of one wheel and tyre:

Mk2 rim 20.4kgs
mk1 rim 18.3kgs
MK1 rim on slicks 18.1kgs
Rota boost lightweight wheel 17.3kgs


Unsprung mass is the weight in a car not held up by suspension; so wheels tyres brakes etc. The larger the wheel diameter and heavier takes a lot more force to turn quickly and hence slows the car. Rule of thumb is for every 1kg removed from wheels/tyre weight is the same as removing 10kgs from the car it also impacts the suspension less as the weight of the wheel is in effect hitting the suspension at high speeds so lighter wheels also helps ride quality. This only affects the driven wheels i.e front on a zs, rear on a m3 etc. 9ive heard maany people say its for all but i dont see logically how as they are being pulled pushed not physically spun round my the engine. So running a zs on aftermarket wheels is the same as removing up to 60kgs from the car, the less weight the less energy required actually helps in small amounts to save fuel (marginally) and does improve acceleration. One for the racing guys here and the speed/fuel conscious.

On this note if anyone else has a boring morning in their workshop at any time with a set of scales and some 16inch hairpins or other lightweight wheels can you post them on this thread?