Spring loaded chain tensioner for running Single Speed on non-adjustable chain tension frames.

• Fits to rear mech hanger position.

Surly Singulator features CNC alloy body, variable chainline, floating tension pulley, stainless steel pivot bushing, Triple sealed reversible spring.

• Compatible with 1/8" and 3/32" chains.
• 11T jockey and slotted alloy chain rejection side plates.

All in all... the mutts nutts of SS chain tensioners.