Its usually a lot better to customise the bike to be honest because in the long run it costs alot more to upgrade parts when they break. So if you have good parts to start with which will last longer, you will be saving money in the long run. There are no local shops around hereford that do trials specific stuff so you will have to order online, or meet up with me cough, and buy some of my cough, stuff What sort of a bike are youlooking to get anyway? 26" mountainbike wheels or 20" bmx sized ? Max...