Bitubo HD012WME03 rear shock absorbers with 270mm wheelbase and chrome spring for Harley Davidson INT. /LENGTH 270MM – are designed for the Custom world, they have precise adjustments in preload and rebound. These shock absorbers are able to guarantee safety and comfort both when driving in the city, tackling potholes and manholes, and during long journeys with loads on board. Spring preload is adjustable via a threaded ring, allowing for precise calibration of the bike’s rear suspension. The shock absorbers are single chamber and pressurized with nitrogen gas, equipped with a floating piston for greater efficiency. The body is made of high-strength steel, while the heads are made of aluminum alloy precision machined using CNC machines. Spring preload adjustment: Continuous.