If you know the history of the stumpjumper fsr you know that it doesnt believe in compromising and not surprisingly this still rings true today with the stumpjumper fsr expert carbon 29 it features srams workhorse one by groupset and the no holds barred guide r hydraulic disc brakes to round out a build that places an equal focus on durability and efficiency at the frame youll find a fact 9m carbon fibre chassis with an m5 alloy rear end that creates a lightweight strong and stiff con