Description
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
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7-speed threaded freewheel
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S.I.S. compatible for indexed shifting
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Bulk packed and polybagged (service-ready)
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Shimano equivalent: MF-TZ21
Specifications
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Speeds: 7-Speed
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Gear Range: 14–28T
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Color: Silver
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Hub Type: Threaded freewheel (not cassette)
Best For
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Older MTB, hybrid, and commuter bikes
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Shimano S.I.S. indexed shifting systems
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Service replacements and drivetrain repairs
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Budget-conscious maintenance and restorations
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