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20h powertap wheelbuild

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20h powertap wheelbuild

Old 01-07-13, 12:20 AM
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20h powertap wheelbuild

My mate and I are considering buying a set of enve 45's with powertap. The wheelset is 24h rear with the powertap and a 20h front. Neither of us need a front wheel so I was pondering the idea of buying a a 20h powertap hub and having my LBS rebuild the front wheel up with the 20h powertap hub. I'm the lighter rider at 68kg so I'd take the 20h wheel. Saving a few hundred buck is the impetus for the idea. Is this a reasonable idea? Would I have to get new spokes for the build? Any other caveats?
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Old 01-07-13, 02:17 AM
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So you want to buy a second powertap hub and have it laced to the rim that's currently part of the front wheel?

If so, you'll probably need new spokes, because I doubt a Powertap hub's dimensions are close enough to the dimensions of the current hub on the front wheel to reuse the current spokes.

Other caveats? Well, I wouldn't ride a 20-spoke rear wheel, in fact I doubt I'd ride a 24-spoke one, but that's just me. I'll just leave this here.

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Old 01-07-13, 02:50 AM
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I'm with ^^^^

I like 36H.
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Old 01-07-13, 08:39 AM
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Your weight isn't so much the problem as the design of the power tap hub. The dish is more and it is hard to get enough tension on the non-drive side spokes. Go with the 32 hole hub. It is heavy anyway and 8 double butted spokes aren't going to make much difference.
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Old 01-07-13, 12:08 PM
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I understand your desire to save some dough, especially if you don't need a new front wheel (who ever does). 20 spokes is pretty skimpy for a rear wheel, so it's a gamble. But if you've been riding light, low spoke wheels for a while, you're in the best position to figure your odds, and decide whether to roll these dice.

Building a rear wheel you want to make sure you have enough total steel for the job, especially because of the high tension difference. Build it 2x, which is full tangent. Use different gauge spokes right and left, possibly 13/14g single butted spokes right, with 14/16g DB spokes left.

Before you go ahead, call the rim maker and make sure the rim will tolerate spoke tensions in the 120kgf range, which you'll need to have decent tension on the left.

All in all, I'd probably see if I could pay a premium to buy 24h rears only vs pairs, or try to sell the unused front (they don't command high prices), but if you're light and ride like a ballerina you might go ahead with your concept. The real problem is that if you find that 20h rear doesn't work for you, you're stuck with an expensive rear hub you can't use or likely sell.
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