What happens when you merge two worlds of innovative technology and pedigree you get the future of trail bikes the stumpjumper fsr expert carbon 6fattie it features the 6fattie wheel system that takes 650b wheels and wraps them in 30 tyres giving you levels of traction control and floatation that will shake your idea of trail riding to the core the stumpjumper is constructed with fact 9m carbon fibre that has been paired with an m5 alloy rear end in order to provide an ultra lightweight