The specialized stumpjumper fsr comp 275 plus mountain bike 2017 has been designed to squeeze every last ounce of fun out of the trail taking any big hits in its stride thanks to its versatile wheel size and brilliant frame design featuring an m5 alloy construction the stumpjumper fsr comp is light weight and durable and also offers the perfect wheel clearance to accommodate the 6fattie wheel system with 30 wide 650b tyres the levels of traction control and float