Track geometry how can it be improved!?

Look at the World Championships and Olympics for the last few years; nearly all the medals were won on bikes which come in only 3 or 4 stock sizes. 6-day riders have custom builds to suit long hours on short tracks, but for everything else it's pointless.

t'other way round, all the sixes I saw last year had team riders on stock frames, but we all know how personal the GB squad's bikes are