The specialized stumpjumper fsr expert carbon 275 mountain bike 2017 follows the philosophy of go big or go home with 650b wheels delivery supreme agility and responsiveness for the ultimate all rounder trail bike at the frame you39ll find a fact 9m carbon fibre trail chassis with an m5 alloy rear end that creates a light weight strong and stiff construction features a swat door tool storage system on the down tube this compartment will fit a tube a tool and pump with