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  1. #1
    Sensible shoes. CastIron's Avatar
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    Wheelbuilding assistance please

    A few questions as I haven't built a set in a while...

    Good online spoke calculator with a modern rim/hub database?
    Seems the DT Swiss one now restricts you to DT brand hubs whereas they used to have pretty much everything. Really, I'm not at all amused by that.

    Next, I can't find much advice on running wide rims. Is there a magic ratio? Sheldon, Schwalbe, Sun, etc all have varying advice but suggest my idea is ok.

    I'd like to build two 26" wheelsets with 31 and 34 mm Sun rims. They would probably have ~2.1" tires but the ability to run tires as narrow as 1.5" would be nice, if not necessary. I've decided on robust DH rims since the potholes are cracking my nice, light, DT rear rim (it was a stretch under my Clydesdale caboose).

    Any help appreciated.
    Mike
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  2. #2
    Senior Member
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    Search for "SpoCalc". It's a .xls (spreadsheet) file with most rim and hub combinations available. I have a link at home for another web-based program that a BF member created based on info from various calculators. I still find SpoCalc easier to use but the web-based program has more rim and hub info. You might be able to find it by searching or I can post the link when I get home. SpoCalc could use an update.

    If Sheldon, Schwalbe, and Sun all agree that your tire and rim combinations will work, I'd feel pretty secure with the choice.

  3. #3
    Type 1 Racer rydaddy's Avatar
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    I use spokecalc and the DT calculator as a check. For DT, you can use any hub you would like... just put "user defined" in the box and fill in the hub dimensions manually. I don't rely on databases for dimensions. Either get it from the manufacturer, a trusted source, or just measure it yourself.

    Can't help you much on the subject of rim width...

  4. #4
    I have senior moments... bikinfool's Avatar
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    I just noticed that limited database in the DT calculator the other day...they just being difficult for the competition? Joe--was EDD the other calculator? http://lenni.info/edd/

    RogerM's site has a calculator, too http://www.wheelpro.co.uk/wheelbuilding/book.php
    suum quique
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  5. #5
    Sensible shoes. CastIron's Avatar
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    Really, I'm trying to be lazy. The DT calculator WAS great when it had the database. Seems SpokeCalc and most others all use the same antiquated database of hubs.

    As to rim width, none of the sources are definitive, rather, they allow one to very reasonably infer I'm in the ballpark. Seems there is plenty of info about going narrower, not wider with rims.
    Mike
    Quote Originally Posted by cedricbosch View Post
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  6. #6
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    You don't need a database, learn how to measure hubs and rims for yourself. It's easy and in the long run more reliable.

    As far as rim width goes I prefer the inner rim width to be between 1/2 and 3/4 of the overall tire width. That's only a guideline, and there's lots of wiggle room. One way is to consider a profile of the mounted tire in cross section. It should resemble an Omega, not an upside down U.
    FB
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  7. #7
    Great State of Varmint Panthers007's Avatar
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    Perhaps the simplest spoke-calculator out there - take a look:

    http://lenni.info/edd/
    How do you keep an idiot in suspense?

  8. #8
    Peace and bicycle grease! une_vitesse's Avatar
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    Quote Originally Posted by CastIron View Post
    Really, I'm trying to be lazy. The DT calculator WAS great when it had the database. Seems SpokeCalc and most others all use the same antiquated database of hubs.

    As to rim width, none of the sources are definitive, rather, they allow one to very reasonably infer I'm in the ballpark. Seems there is plenty of info about going narrower, not wider with rims.
    be careful with rim width and brake compatibility. Make sure that the posts on the frame you're intending to build these wheels for will allow your brakes to work well with wide rims.
    Ross Mt Hood
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  9. #9
    Sensible shoes. CastIron's Avatar
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    Disc brakes.
    Mike
    Quote Originally Posted by cedricbosch View Post
    It looks silly when you have quotes from other forum members in your signature. Nobody on this forum is that funny.
    Quote Originally Posted by cedricbosch View Post
    Why am I in your signature.

  10. #10
    BeaverTerror Yan's Avatar
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    EDD is the one I use as well.
    Yan

    2013 True North custom touring; 2010 Novara Randonee; 2009 Unicycle.com Club 24"; 1989 Miele Tivoli; 1979 Colnago Sport

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