a sproket it totally oposite to a freehweel, a sproket (fixed cog) dosent move, where as a free wheel is designed to move. you should realy run a 12T fixed cog on the back, and a 18T freewheel on the front.
i own a pair this si the first ive heard abiot thethread rounding of because the cranks are more expencise it dosent mean that the thread wont round of, there mroe expensie possibly beccasue off the CNC on the cranks....but my thread are definatley fine, jst be careful when you put the freewheel or fix cog on
making your own pads with own material and backings may be as good as, black pads on a smooth rim with gt85 all over it, you need proper material and backings or you could try your own but at your own risk!
YMSA biketrials, roughly 5 compotions a year find akll the information here tells you everything where the compotions are how to get there results the lot, hope i helped, by the way all the compotions are in the derbyshire area!
yea ive got some there just the right length for me, also very strong, i think t-birds only come with sqaure taperd bottom brackets so be sure to order the rite ones!(the square tapperd not isis)here
when you get to you 5th-6th grind you understand, lol the flatspots and dents get that big when they fold they crack also, and when you bend them back ot the jst crack even more unless you run 40 psi of course