You can't tighten a chain on a non-gear bike. Non-gear bikes, also known as "fixies" or "single-speed" bikes, have a fixed gear system where the chain is always connected to the rear wheel. This means the chain doesn't have a derailleur or other mechanism to adjust its tension.
Instead of tightening the chain, you might need to:
- Adjust the chain tension: This involves moving the rear wheel forward or backward in the dropouts to create the desired chain tension.
- Replace the chain: If the chain is worn out or stretched, it needs to be replaced.
Remember, a properly adjusted chain is essential for smooth riding and preventing damage to the drivetrain.
