What is a Rear Shock (Monoshock)?
The single spring-and-damper unit that controls how the rear wheel moves over bumps.
Simplified animation — not to scale.
In plain English
Most modern bikes use a single rear shock working through the swingarm, combining a spring to support weight with hydraulic damping to control how quickly that spring compresses and rebounds.
“The rear equivalent of the front forks — just condensed into one unit instead of two.”
How it works
As the rear wheel hits a bump, the swingarm pivots and compresses the shock's spring. Oil forced through internal valving damps that compression and the subsequent rebound, keeping the tyre planted rather than letting the bike bounce uncontrollably. Higher-spec shocks add adjustable compression and rebound damping on top of preload.
Signs of trouble
- ⚠Excessive bouncing or a wallowy, vague rear end
- ⚠Oil leaking from the shock body
- ⚠Bottoming out harshly over larger bumps
- ⚠Uneven tyre wear from a sagging or worn shock
£150–£700
Always get a written quote. Prices vary by bike, region, and parts brand.