Chain ring protector

Chain ring protector

Chain sprocket with opposite frangible side guide plates

Chain, hub, spoke and derailleur guard

Chainguard

Chainguard and bicycle frame

Continuously variable transmission

Continuously variable transmission case cover

Cover structure of belt converter

Crank arm set

CVT housing having wear-resistant bore

Damping device for gymnastic apparatus

Device for preventing separation of a belt from a motor pulley

Dragchain substitute

Dragchain substitute

Easily mounted fully enclosed chainguard

Engine

Engine

Front derailleur for a bicycle

Front gear for bicycle with chain restoring device