How To Reattach A Bike Chain. When your bicycle chain gets old and stretched its time for a change. Pedal the bike backward slowly for 1 full rotation with your hand.
Thread your length of chain back over the lowest cog and through your bikes derailleur. Wrap your chain around the front chain ring and the desired cog in your cassette trim the chain so it is tight and reattach. Most multi-tools will come with a chain breaker attachment make sure yours has one before you leave the house.
Lay the outer end of the chain flat so the pin is now horizontal to the ground.
Thread your length of chain back over the lowest cog and through your bikes derailleur. Now is a good time to. First jettison the old chain. If you just remove one segment you cant reattach it.
