MKS CA-NJS Chain Tug

I recommend this product

used the 8mm on my langster to stop the rear wheel sliding forwards under hard acceleration, appear to do the job

30 quid may seem expensive, but they are nicely machined bits of steel. Very clever combination of a normal threaded bolt and then a sleeve like bolt with threads running in opposite directions, so that as you screw in clockwise, the sleeve bolt comes out of the tug whilst also pulling the inner bolt rearwards. Almost as hard to conceive as a rubric cube.

Rather than using the small thread from the 5mm version, MKS could improve this by using more sturdy bolts, and I wonder about the long term longevity of these small bolts given the force and tension they are under.

I recommend this product

work easily and effectively wish I'd bought them years ago as they prevent the slight wheel slippage that builds up over time and results in a slack chain.