SunRace 7-Speed Freewheel — 14–28T, S.I.S. Compatible (Silver)

This SunRace 7-speed threaded freewheel is a reliable, service-friendly replacement designed for bikes using Shimano S.I.S.–compatible indexed shifting and traditional screw-on hubs.

Built for straightforward compatibility and dependable performance, this freewheel delivers smooth, predictable shifts across a practical 14–28T gear range. It is bulk packed and polybagged, making it ideal for shop service departments and high-volume repair work.

Functionally equivalent to Shimano MF-TZ21, this freewheel is commonly used on recreational, commuter, hybrid, and older mountain bikes where durability and compatibility are the priority.

Product Details

• 7-speed threaded freewheel

• S.I.S. compatible for indexed shifting

• Bulk packed and polybagged (service-ready)

• Shimano equivalent: MF-TZ21

Specifications

• Speeds: 7-Speed

• Gear Range: 14–28T

• Color: Silver

• Hub Type: Threaded freewheel (not cassette)

Best For

• Older MTB, hybrid, and commuter bikes

• Shimano S.I.S. indexed shifting systems

• Service replacements and drivetrain repairs

• Budget-conscious maintenance and restorations