RockShox Rear Shock Damper Piston/Shaft Assembly Inlcudes Piston Assembly - Deluxe Thruaktiv A1-B1 MFPN=WH21AERSUBST3027.5R The Redline Classic K1 is

The Redline Classic K1 is built with one goal in mind: to get you to the finish line first

Good forefoot flexion for classic style and stiff rear part for perfect torsion-to-flexion rigidity ratio

stable blocks for the demands of racing or tough terrain

Carbon midsole insert provides increased stability and precision for optimized skating performance

RockShox Rear Shock Damper Piston/Shaft Assembly Inlcudes Piston Assembly - Deluxe Thruaktiv A1-B1 MFPN=WH21AERSUBST3027.5R The Redline Classic K1 isRockShox Rear Shock Damper Piston Shaft Assembly (Inlcudes Piston Assembly) Deluxe Thruaktiv (A1 B1). RockShox Deluxe ThruActiv Rear Shock Damper Shafts for service and repair.