Simon:
haf1zur:
its actually going to make a big difference
unsprung weight vs sprung weight
watch your mpg
Could you explain that so an idiot (me) can understand. 
from what i read and been told
1 kg of unsprung weight is equal to 10kg of sprung weight, some say its around 1 to 4.
anything that is not on springs, ie: wheels, brakes, spacers, hubs etc are unsprung
the rest, body, seats, engine etc etc are sprung weight cause they ultimately put their weight on the springs of the suspension
i had the very same spacers on mine, 15mm all round, was definitely noticeable, its like having bigger heavier wheels
| • A forged, more lightweight wheel has a lower angular moment, therefore lower inertia. This leads to a lower absorption of power in the acceleration stage, and greater effectiveness during braking. |
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• The light weight of the wheels increases the suspended mass/non-suspended mass ratio, which means better functioning of the suspension.
the same applies to spacers and anything else that is unsprung.
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A lightweight wheeldoesn’t simply increase straightline performance, when you hit the bumps and twisties they come into their own.
A lightweight wheel is much more eager to change direction.
Less unsprung weight means that your suspension won’t have to try and control 25kg of wheel and tyre, bouncing around in the arch.
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