The universal tool for every chain. With this compact chain tool you can easily push out the chain pins. Indispensable for repairing a break or customizing a new chain. Suitable for almost all common bicycle chains. Additional information Type: Universal. Compact design. Function: Shorten chain. 8711646029028 This allows a bicycle chain to be shortened or repaired by partially pushing out the pin of a chain link. Remove the unnecessary links with the chain tool. A tip here is not to push the pin completely out of the link, because it is very difficult to put it back in. Place the chain over the sprockets and connect the ends of the chain with a Simson connecting link.