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  1. #1
    mtbr member
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    Hotrock Freewheel & Chain Swap

    When I recently measured the chain on my son's hand-me-down 2005 Hotrock 24 I found out it is time for a new chain and freewheel.

    The original freewheel was a Shimano MF-HG37 (14-28T). I found another freewheel, a Shimano MF-TZ07, in my parts bin. 14-28T also.

    Does anyone know what is the difference in the two?
    Last edited by coopdad; 01-15-2013 at 04:40 PM.
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  2. #2
    GMF
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    I do not know what the difference between them is (HG = hyperglide, TZ = ?), but in general 7sp shimano freewheels are completely interchangeable. You should be able to swap, no problem.

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