• Having spent an hour the other day swapping freehub bodies between 3 different 7 speed Shimano hubs I can assure you that whilst they feel like they might all be interchangeable, they ain't.

  • Without having any other hubs/bodies to try, this is also the impression I get from internetting.

    Although as mentioned, I think the freehub off a Shimano 600 FH-6401 would fit the FH-1055. I suspect the only differences are the number of pawls (three on the 600, two on the 1055), and the colour.

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