Mountain Bike Chain Fix. Numbers on the tool will indicate how worn your chain is and whether it's time to replace your chain. Cutting a new bike chain to the correct length for installation and removing a damaged link for an on-trail chain repair are essentially the same job..
Crank the tool until the link loosens and pops out. Come visit the Apex, NC location of The Bicycle Chain. This awesome little tool allows you to fix a broken chain wherever you are and you can quickly whip out a couple links and reconnect your chain, effortlessly.
Bicycles with derailleurs use a chain that normally cannot be removed unless you separate one link with a chain tool (photo, left), a special bicycle tool that lets you push a pin out of the chain (more about this procedure later).
Again, if you don't have a spare connecting rivet or master link, be sure to push out a rivet only as much as you need to in order to separate the chain.
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To tighten a loose chain on a hub- or fixed-gear bike, first use a wrench to loosen the axle nuts on the rear wheel. By removing links, you reduce the overall length of the chain which reduces the slack in the chain. A chain tool is a device that pushes the rivets into and out of a chain.