Check Chain Wear

Steps

1. Clean the Chain: Ensure your chain is relatively clean so you can get an accurate measurement. A thick layer of grease can throw off the tool.
2. Position the Tool: If using a dedicated chain checker, insert the curved end into the chain according to the tool's instructions.
3. Drop the Gauge: Let the other end of the tool drop toward the chain. Do not force it; the tool should fall into place under its own weight or light pressure.
4. Read the Result: Most tools have two settings (e.g., 0.5% and 0.75%).
   • If the 0.5% side drops in, your chain is starting to wear.
   • If the 0.75% side drops in, it's time to replace the chain immediately to prevent damage to your cassette.
5. Ruler Method (Optional): If you don't have a tool, use a ruler. Align the 0" mark with the center of a pin. On a new chain, the 12" mark will align exactly with the center of another pin. If the pin is more than 1/16" past the 12" mark, the chain is worn out.
6. Determine Next Steps: If the chain is within limits, keep riding! If it's worn, plan for a replacement soon.

Tips

• Check your chain wear every 200–500 miles, depending on riding conditions. Mud and grit act like sandpaper and accelerate wear.
• Replacing a $30 chain on time saves you from replacing a $100+ cassette later. It’s the cheapest insurance for your bike.
• If you've let the chain go too long (past 0.75% wear), a new chain might "skip" on your old cassette because they've worn together. In this case, you may need to replace both.