SHIMANO Alfine Chain Tensioners

This is meant for another type of bike, I think. But I bought it to try on my single speed mountain bike that I converted from a 1x10. It took a bit of trial and error, but I got the position right. Some of the cheap tensioners have a threaded mount for a single jockey wheel and a lock nut. This is OK, as you have infinite possibilities for side to side position. But they can loosen, and then you drop the chain. This one is fixed, but you can adjust it a bit with spacers. This seems to be much more stable. It does require some trial and error with your cog and spacers on the freehub body versus the spacers on the tensioner. But once you find the sweet spot, it is locked in.This is metal, not plastic like many. It has a solid build and is quite durable. It is not the easy solution for a single speed build, but it is the beast way to go.

Quello che volevo

Execellent product. Using with ebike on single gear freewheel.

First and foremost the shipping was fast and tracking was on point. The idea with this tensioner is to line the pully with the rear cog. Don't worry about your front sprocket having a perfect line. Your chain won't jump off. All I had to do was reposition my spacers and cog to line up with the tensioner pully. Didn't even have to use the washers that were provided. About the Alfine tensioner. This is a good quality strong spring tensioner that will hold your chain steady and strong.

Doesn't work with small sprockets