How do I repair a 21 speed bike chain?

Answer by  CarolynOsborne (2804)

Get the tool that removes rivets from the chain links so you can get the chain off the bike. Once you have it off, clean the chain. Test each link to make sure it is not frozen. Replace frozen links. Lubricate the chain (WD 40 is great). Put it back on and put the rivet back.

Answer by  Matju (111)

I think you can not repair your bike chain by yourself, because you need specialistic tools, you can find it at bike service.