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The ISO freewheel thread standard is 1.375" x 24tpi Most freewheels I have encountered have been ISO. Some hubs use "British" threading at 1.370" x 24tpi If you use an ISO freewheel on a British thread, it will work, but you should check there is enough thread engagement to avoid stripping the hub. The trials-oriented retailer TartyBikes suggests 9 thread ...

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