I'm thinking of making Tom's bike "race legal". At the moment he's running a 50/34 chainset with a 12-25 8 speed cassette. I think that if I changed the big chainring for a 44 and built up a 15-27 cassette then that should just about make him legal. Of course, the British Cycling website being what it is, actually finding the gear restriction rules is proving difficult.
Anyway, what I was wondering was a) will it work and b) where's the best place to get the bits?
I'm not sure if he wants to race much - apart from the odd Go Ride event - but big gears can't be good for small knees. They aren't much good for my knees either.