If you know the history of the stumpjumper fsr you know that it there is no compromising introducing the 2017 stumpjumper fsr expert carbon 29 it features a fact 9m carbon fibre chassis with an m5 alloy rear end that creates a lightweight strong and stiff construction the carbon molding process also allowed specialized to revolutionize how you carry your trail essentials with the all new swat door this compartment will fit a tube a tool and pump without rattling or compromising the struc