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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Sprung vs Unsprung weight, innit.
Removing mass from rotating components - wheels, brake disks, sprockets, chain, tyres (where allowed) - has a much better effect as it reduces the energy required to rotate them so in theory you should get better acceleration, improved handling (due to lower centrifugal forces), etc.