The Heyday! is Salsa's most versatile fat bike designed and engineered to excel in the wide variety of conditions. The frame utilizes 197mm rear spacing to accommodate up to 5" tires and the 100mm threaded bottom bracket allows a wide range of crank (Q-factor) choices. Alternator 2.0 dropouts allowing for some of the shortest chainstay lengths available easily supporting single speed or geared drivetrain options. The Heyday! can do it all.New Salsa Kingpin carbon fork features four sets of Three-Pack mounts plus lowrider mountsAlternator 2.0 dropoutsCarbon frame with 12x197mm rear spacing and thru-axle dropoutsAlternator 2.0 dropoutsHeadset included Rear Axle 12mm Thru x 197mm Brake Type Disc TT (Effective) 594 Fork Type Rigid Fork Material Carbon Frame Material Carbon Frame Type Rigid Color Black Mfg Size Small Platform Heyday! Wheel Size 29+ Defined Color Black Size Small