FOSTI F31 chain tensioner

FOSTI F31 axle chain adjuster: 73 mm plate with a Ø 16 mm axle hole, 64 mm adjusting bolt with a rectangular head and a hex lock nut.

• This is an axle adjuster: the rear axle bolt passes through the plate, and the adjusting bolt pushes the axle back until the chain is tight
• Dimensions from the maker's drawing: plate length 73 mm, axle hole Ø 16 mm, adjusting bolt length 64 mm
• A Ø 16 mm hole is the diameter your rear axle has to be — that is the first thing to check
• Lock nut on the bolt — once the tension is set, tighten it, otherwise vibration will undo the bolt
• Adjusters go in pairs, one each side, turned by the same amount — otherwise the wheel sits crooked
• Chains, joining links and slider shoes are in the same category

To be straight with you: whether the adjuster is sold singly or as a pair, the maker did not say — there is one of them in the photo. Nor is it stated what machine FOSTI F31 is meant for. Measure your axle diameter and write how many you need — we will confirm the details before you order.

24-month warranty · tel. +370 685 777 56