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Question for wheelbuilders: 32 spoke hub for 28/24/20 spoke rim?
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Noobie question in know: Can you use a 32 spoke rear hub, such as a powertap for example, and build it into a wheel with less then 32 spoke holes by simple skipping some holes on the hub?

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Re: Question for wheelbuilders: 32 spoke hub for 28/24/20 spoke rim? [mtlrunner] [ In reply to ]
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We used to do this about 20 years ago, back before rim manufacturers made rims with fewer than 24 holes. If I remember correctly, the only reasonable way to do it is to build a Rolf style (paired spokes) wheel. You If you have a 32 hole hub, then you either need a 32 hole rim, or a 16 hole rim where the spoke holes are drilled in pairs. (Two holes close to each other, then a big gap, then two more holes...) Or you can use a 32 hole rim and use two consecutive holes on the rim, then skip the next two holes, then use two holes again. The reason you can't just use every other hole on a 32 hole rim is that every other hole is drilled to face one of the hub flanges. And the reason you can't just use a regular 16 hole rim (not drilled for paired spokes) is that the hole offset from the left hub flange to the right hub flange won't be correct.

Hope that helps.

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Re: Question for wheelbuilders: 32 spoke hub for 28/24/20 spoke rim? [mtlrunner] [ In reply to ]
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In Reply To:
Noobie question in know: Can you use a 32 spoke rear hub, such as a powertap for example, and build it into a wheel with less then 32 spoke holes by simple skipping some holes on the hub?

It should be possible, you'll need a 24 hole rim and lace it up similar to how Fulcrum, Campy and others have done.

I used a wheel like this for over 20,000 miles with an old Veloce hub and Mavic CXP 14 rim. I eventually wore all the way through the rim's sidewall but never trued the wheel. It was indestructable.

I've explained how to do the lacing a few times on ST, you can search for them, I was able to find one explanation here:

http://forum.slowtwitch.com/...20superdave;#1257740


-SD

https://www.kickstarter.com/...bike-for-the-new-era
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Re: Question for wheelbuilders: 32 spoke hub for 28/24/20 spoke rim? [mtlrunner] [ In reply to ]
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Hi,

If were not a PT hub you could do some patterns and spoke counts other than 32h to 32h.

But most of the info from PT suggests that a 2x pattern on each side is key to accurate torque readings from the hub.

Maybe contact the guys at Wheelbuilder.com and see if they have any results from experimental lacings.

TP
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Re: Question for wheelbuilders: 32 spoke hub for 28/24/20 spoke rim? [SuperDave] [ In reply to ]
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Re: Question for wheelbuilders: 32 spoke hub for 28/24/20 spoke rim? [mtlrunner] [ In reply to ]
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I had a client do exactly this with a PT hub, and it was a disaster. The wheel got more and more inaccurate, and eventually the hub needed to be replaced.

It may well have been something other than the lacing pattern to blame, but the wheel was fine with the 32 spoke lacing and basically useless with the alternate lacing - and not salvageable by a rebuild with the original lacing pattern.

Back in the day, I saw more than one old Campy hub twist like a pretzel when laced the way you are asking about, and it seems reasonable to guess that the same forces may have been the cause of the troubles with this PT wheel.

YMMV, but IMO, better to avoid the potential trouble for a weight savings that is the equivalent of a mouthful of gatorade...


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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
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