Are you looking for a professional chainring cycle? Find out more about this article below. Do you have any questions? Please contact customer service Decathlon.the chain is one of the essential parts of your bicycle. With this cycle chain carrier, you keep an eye on the fact that it's already ready for replacement! You place it between the links and the lever will move into one of the levels indicated on the meter. With this, you can then assess whether the chain is worn out or lasts a long time! use: 1. First place the wear meter with the left side (with size levels) on an inside switch on the chain. Then place the right-hand side between an inner link. 2. Now you can see whether the pointer on the lever is at the top or bottom of the counter. This gives an overall indication of the chain's range. If it's at the top of the counter, the chain isn't quite exhausted yet. The further down the pointer is, the more exhausted the chain is. If it's standing at the very bottom, it really needs replacing. specifications the bike chain carrier can be used to switch chains and chains without cash singless 1/2 x 1/8 measures wear on 11 links overall, indicative measurement without concrete values