Is your old bike not shifting properly? Might be time to replace the freewheel and chain. The MF-TZ500 is a 7 speed multiple freewheel (3x7-speed) and is recommended to be paired with a Shimano HG/IG 6/7/8S chain.
Gear ratio: 14-16-18-20-22-24-34
Recommended chain: Shimano HG/IG 6/7/8S
Features Hyperglide Technology with specially positioned shift ramps and tooth profiles for improved chain control during shifting