Note: Reproduction Springer forks were never designed for modern high-speed motorcycles and offer no damping

like with all performance cams

but Air-SS grip does not have any surface bumps but a consistant surface diameter

937" length cylinders

Fits: > 74-21 H-D with single or dual throttle cables (excl

PS, 412 series shock set. 12.5". STD Duty. Black Dyna 91-17 Koppling/Gasvajrar Note: Reproduction Springer forks wereDescription 412 series shocks: Best value Progressive Suspension shock, great as stock replacement. Nitrogen charged double steel wall body. Multi staged velocity sensitive valving. Five position cam style preload adjustment. Note: Black 412 shocks may be supplied without lower cover. What are Progressive Suspension's 'Heavy Duty' shocks? If you are a lightweight rider with a lightweight passenger, STD Duty is probably your best choice, heavy duty