Bikemonger says.... This is the tensioner that started it all off, updated, it is still a great bit of kit.
Surly says..... Spring loaded chain tensioner for running singlespeed 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.
I bought this to replace a cheaper chain tensioner that I had used to covert my beloved old Kona Kula to a single speed, that subsequently bust on me. The singleator is a beautifully engineered and solid piece of kit, which to my mind justifies the higher price. And with 3 months of trouble free riding under its belt, it certainly works as good as it looks.
It comes with 2 springs, to enable you to choose between tensioning the chain downwards or upwards (the latter giving you more chain wrap). My only (minor) gripe… you need an 18mm cone spanner to fit and adjust. Not the most common of tools and took 3 bike shop visits to find one. In hindsight, I’d have ordered the Surly singleator wrench tool at the same time as the chain tensioner. Otherwise, very happy bunny with my purchase, hence the 5 stars.