Pardon me, but does anyone know the specs for this hub?

Discussion in 'Cycling Equipment' started by Ricitius, Jan 17, 2009.

  1. Ricitius

    Ricitius New Member

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  2. Ricitius

    Ricitius New Member

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  3. alfeng

    alfeng Well-Known Member

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    FWIW. You can take this as simply being my opinioin, but what you want to do (based on your comment in another thread -- 32h hub with a 36h rim) is not a good idea ...

    BECAUSE, the hub you are referring to is relatively inexpensive to substitute with a 36h front-OR-rear hub (vs. the similar Powertap hub mismatch).

    Regardless, I hope you realize that the spoke length is normally based on the specific RIM + hub ...

    For the custom lacing, you will probably need at least three different spoke lengths ... the lengths probably can be calculated, but trial-and-error are probably the 'easiest' (but, very tedious) way to determine the spoke lengths -- this is probably NOT something you want to do as your first wheel build.
     
  4. Ricitius

    Ricitius New Member

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    Oh yeah for sure. Thanks for the advice alfeng. The rim I'm using is a 36h 700c Velocity Deep V (ERD is 882). I found this pretty keen spoke length calculator on Mr. Brown's website:

    http://www.sheldonbrown.com/rinard/spocalc.htm

    It's an Excel spreadsheet works well with the info on the hub that I got and the info on the rim. It have me all the spoke lengths I need: (0) 260.9; (1) 263.5; (2) 270.8; (3)281.3; (4) 293.2; (5) 293.2 (just in case they don't have the right length for the three cross.)

    However these lengths are calculated on the information found for that particular front hub ( http://www.yogarup.com/wheels/hubs ) (the first one on the top of the list.). I'm not sure if it's this one:


    [​IMG]

    It's off a previous bike I had, a 2006 Bianchi San Jose.
     
  5. alfeng

    alfeng Well-Known Member

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    This is the spoke length calculator that I use:


    You can change the variables. The only requirement is that your computer (most do) have JAVA installed on it ... if not, you can download it from SUN MICROSYSTEM's website.

    Well, you are going to be very unhappy if you use the ARUP data because those are for high flange hubs (most track hubs are high flange because the resulting wheel will generally be laterally stiffer) -- your "Bianchi" hub is a low flange hub.

    You can use the data from almost any low flange hub ... the flange diameter will probably be either 38mm or 39mm, or something in between. The calculated difference in the spoke length is negligible ... when in doubt, round DOWN.





    Here's the calculated spoke length data (presuming an effective rim diameter of 582mm for your Velocity Deep V rim):
    283.0mm == 32x3

    285.3mm == 36x3


    AFTER you decide WHICH spoke holes in the rim you want to skip (none, personally) & I recommend that you lace up hub with either 284mm (or, 285mm) spokes with the presumption that you will need to shorten several of the spokes ... BUT, I have a spoke threader & can shorten & the length of a too-long spoke & add threads as necessary ...

    The shorter spokes will probably be ~3mm shorter than the longest spokes, BTW.
     
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