How to Easily Take the Chain off Your Mountain Bike
To take the chain off a mountain bike, first shift into the smallest chainring and rear cog. Use a chain tool or quick-release link pliers to remove the chain’s connecting link. If using a chain tool, align the tool’s pin with the chain pin and turn the handle until the pin pushes the chain pin out. Once the chain is disconnected, you can slide it off the chainrings and cassette.