you need a correctly fitting seat.firm but not tight.plays a huge role in pain relief.too loose and you flop about,too tight and you use muscles that hardly ever get used.i cracked 2 rips from using a too loose seat.i will find and scan a pic of me in my clubman,crossed up on 3 wheels at 80kph.damn i miss it.but even after racing a kart for 5 years,when i had a drive of a twin clubman,nearly identical to mine but with another engine,its a totally different animal.everything happens quicker,and the pain level rises.your forearms get a major work out.i shudder to think what a twin super is like,they run 4 wheel disc brakes,front brakes normally use a lever bit like a motorbike under the steering wheel.the clubby like most karts uses a single disc on the rear axle,twin clubby uses 2 discs on the rear.but them supers......man oh man...i went to the australian champs as a spectator...750 drivers,and constant racing....lots going on .but the supers were the ONLY class to stop everyone from what they were doing and crowd the fence.my mate had a kart that raced with them,but he only had a sinlgle 135cc engine,and cops a lighter weight than normal to try and keep up.haha not a chance.them things boggie.and V.O. he was correct,i think you need 3 yrs experience before you can APPLY for a license to drive them.