I've bought an XJR400 wheel and brake set-up to fit to my Genesis. What is the max tyre size i am able to fit with this conversion? I'll get some pics up of the budget track bike build soon! Cheers

what size is the rim? a larger rear wont do much for the handling but if it's for tyre choice it might be worth seeing if you can acquire a dead tyre of the width you'd like and try it first.

It's 17" - i bought it to enable me to get a half decent choice on tyres

I don't think you'd go too far wrong with a 150 on it to match the 110 on the front-

http://www.ebay.co.uk/itm/110-70-17-150 ... 43a9a924ea

How much?

meant the width! oops

I've got a 120 on the front, is that not standard size?

nope, 110 front up 'till 3tj I believe.