Twin Shock (Dual Shocks)

A twin-shock layout has two shock absorber and spring units, one on each side of the bike, connecting the swingarm to the frame. It was the standard rear suspension until the late 1970s and early 1980s, when single-shock (monoshock) systems with linkages took over on sport and off-road bikes.

Twin shocks are simple and cheap and remain common on cruisers, retro models, many scooters and small commuters. Their downsides are limited travel and that both units must be set up identically.

When replacing them, always change both at once and fit the correct length – a longer shock changes ride height and steering geometry. Check that both preload adjusters are set to the same position.