Smart assembly – Replacing a bike chain and no need to remove it from cassette.
SIGMA PRO, a synonym of strong combination, makes the chain assembly safe and tool-free.
HOW IT WORKS
A. Sigma Pro link
B. Sigma Pro top plate
Push and hold the top plate through the chain link
Place the top plate over the free rivet groove while bending the link
Press down Sigma top plate until you hear a “click”
Check and make sure no stiff links
Bending it hardly with the top plate toward yourselves until it jumps out.
Noted: SIGMA PRO only for One-time use.