How Do You TIGHTEN A CHAIN on a SINGLE SPEED BIKE?

This might help you in tightening your chain.

Tools needed: 

Phillips screwdriver
10mm and 15mm wrench

Steps:

1. Loosen the nut and bolt holding the coaster brake arm

2 . Loosen the axle nuts
3. Feel the tension and move back or center the wheel to re-align the chain
4. Check tension by moving the chain half inch up and down

5. Once done you can tighten the axle nuts
6. Re-check tension
7. If satisfied with tension, secure the coaster brake arm with the nut and bolt

You may also check this video for a more detailed tutorial: 

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