The specialized stumpjumper fsr expert carbon 275 plus mountain bike 2017 redefines what39s possible on the trail with incredible improvements to traction control and floatation thanks to its 6fattie wheel system featuring a fact 9m carbon fibre chassis with a m5 alloy rear end the stumpjumper expert carbon delivers a ultra light strong and stiff frame construction the carbon molding process also allowed specialized to incorporate the swat door tool storage solution into the