downhill bicycle and cyclist
Downhill bicycle: small, very sturdy bicycle for racing on rough ground with steep hills and strewn with obstacles.
hydraulic disc brake 
Brake with jaws that squeeze a disc to slow down the wheel; the braking power is produced by hydraulic pressure.
raised handlebar 
Grip whose elevated position makes the bicycle easier to steer when going downhill.
protective goggles 
One-piece watertight eyewear that protects the eyes from flying mud, stones and insects.
chin strap 
Part of the helmet that protects the cyclist’s chin.