A set of Promax C-1 Chain Tensioners, including different colored bolts and clamps to prevent axle slipping.

A pair of blue metal Promax C-1 Chain Tensioners on a white background, used as chain tensioners for a race bike to prevent axle slipping.

A pair of Promax C-1 Chain Tensioners on a white background, perfect for chain tensioners on a race bike.

A yellow bracket with two holes on it, designed for race bikes to prevent axle slipping and maintain proper chain tension, called Promax C-1 Chain Tensioners.

Highlights

Keeps your axle put
For frames without tensioners
Fits 3/8 inch and 10mm
Two axle hole design

Description

Promax C-1 chain tensioners are the perfect upgrade for you race bike if you're looking to add a little colour to the rig, or if you are installing them as insurance against your axle slipping. If you have a frame without a inbuilt chain tensioner system, then you are risking going over the bars if your hub moves in the dropouts, using your face as a brake. Avoid the hospital and dentist with these budget friendly, and colourful alloy chain tensioners from Promax.

Features

Keeps your axle put. Chain tensioners stop the hub creeping forward in the dropouts, which is what causes a chain to go slack under power.
For frames without tensioners. If your frame has no built in tensioner system, these do the job from outside the dropout.
Fits 3/8 inch and 10mm. They suit both 3/8 inch and 10mm axles, which covers the sizes used on most race hubs.
Two axle hole design. Each tensioner is drilled with two axle holes so you can line it up with your setup.
CNC machined 6061-T6. Machined alloy bodies come in colours, so you can add a bit of detail to the back of the rig.