Currently Shimano is leading the way with a race - ready system , SRAM has promised a reworked version of its hydraulic discs in mid-April .
Campagnolo is thought to be working on a system too .
Currently Shimano is leading the way with a race - ready system , SRAM has promised a reworked version of its hydraulic discs in mid-April and Campagnolo is thought to be working on a system too .