The Trek Fuel EX 9.8 Carbon is the best choice for riders who want an all-mountain ripper that excels at everything from marathon enduro races to burly technical terrain and singletrack. With no corners cut, A Carbon frame, Bontrager Carbon wheelset, Fox performance 36 Float suspension with Sram's 1x12 GX Eagle drivetrain makes this the recipe for a very fast, agile and a ruler on any trail or singletrack, light on the climbs yet stable. Trek Fuel EX 9.8 Details RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control  A sleek internal storage compartment gives you a versatile spot to stow tools and gear. Fuel EX 9.8 is the single best choice for riders who want an all-mountain ripper that excels at everything from marathon races to burly technical terrain to singletrack. RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control We expanded our size range to ensure a better fit for all riders. And, you get the fastest wheel that fits your frame: XS frames get 27.5? wheels, S frames get to choose between 27.5? or 29? and sizes M to XL get 29? wheels.