MF-HG37 13-15-17-19-21-24-28 TeethIt is generally good practice to replace the chain when you replace the freewheel. We recommend the SRAM PC-870 chain for use with this freewheel.This freewheel will index with any Shimano-type 7-speed shifter.This freewheel uses the Park FR-1 extractor.Are you sure you need a thread-on freewheel, not a cassette? Click here to find out which type your bike needs!
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