How To Replace a Bike Chain

Check Your Chain for Wear

• Insert the chain checker tool (see photo) but don’t force it! If the ends fit relatively easily into the links and it sits flat along the chain, it’s time to replace it.
• I use this Park Toolchain checker. The .5 percent side is for 11-speed and higher chains, while the .75 percent side is for 10-speed and below.

Article source here: How To Replace a Bike Chain