12-13 Dyna)

Note: Officially fits 99-06 Big Twins but will retro-fit back to 91-98 models

04-22 XL Sportster

Comes with T5 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise

* Maximum RPM

PS, 412 series shock set. 12". STD duty. Black 1980-08 Transkåpa&Packningar 12-13 Dyna)Description 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