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  1. #1
    RoadBikeReview Member
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    Dura Ace FH-7700 vs HB-7700 rear hub

    Trying to build my first wheelset with some hubs that I managed to get for free. A bit of a mashup, the front hub is a Dura Ace FH-7700 32H, and the rear is a Dura Ace HB-7700 28H. I'm trying to calculate spoke lengths, but I'm having trouble finding the measurements for the HB-7700, all I can find are stats for the FH-7700 rear hub. I also *think* the HB is an 8-speed while the FH is a 9-speed, but can anyone confirm this?

    spocalc only has data for FH-7700 9-speed, so I stumbled upon this thread, but it's unclear in the last post which set of 7700 hubs the posted measurements are for... just wanted to see if anyone can confirm this before I attempt to measure myself.

    Any suggestions would be greatly appreciated!

  2. #2
    A wheelist
    Reputation: Mike T.'s Avatar
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    You MUST measure the hub yourself. As you're finding, it's risky to rely on figures you find or are given. Guess what happens if they're wrong? Get Roger Musson's wheelbuilding e-book and he shows you how. Use his calculator too.
    .
    Mike T's home wheelbuilding site - dedicated to providing Newby wheelbuilder's with motivation, information and resources.

    Everything above, up to that blue line, is IMO IMO.

  3. #3
    RoadBikeReview Member
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    Are you sure you have that the right way round? 'HB' is Shimano's prefix for front hubs and 'FH' is for rear hubs. HB short formhub and FH short for freehub.

  4. #4
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    Yeah, good point. I could have sworn it was HB-7700, but I checked again this weekend and it was indeed FH. I made some measurements that I don't have on hand right now, but I'll update the thread when I find them.

  5. #5
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    For anyone curious, here are my measurements (***NOTE: some of these disagree by several mm from the stock measures on leonard.io/edd, but they do agree with the post I mentioned earlier in this thread):

    Dura Ace FH-7700 Rear Hub (28H - 9spd):

    Flange diameter: 44mm
    Center to left: 35mm
    Center to right: 19mm

    Dura Ace HB-7700 Front Hub (32H)

    Flange diameter: 38mm
    Center to flange: 35.5mm

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