No one really uses discs on 26@ trials bikes anymore. They are really easy to hit and not as adjustable and invulnerable as a magura HS33. Also, the Maguras are easier to maintain and boast more hold and 'on off power'. Discs tend to be less bitey than the rim brakes. It would be worth getting a Hs33 other than a disc because the parts widely available, cost less and are beter for the job or trials. Max..