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Old 11-19-07, 10:13 PM   #1
Snuffleupagus
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Spoke length for PowerTap Pro laced to DT RR 1.1?

Well I, in my infinite wisdom ordered all 288mm spokes thinking that a mm or two here or there wouldn't matter; so of course when I built up the wheel the tension was all wonky, with the non drive side having far less tension than the drive side.

I'm not sure which calculators to trust, so if you guys can point me in the right direction I'd appreciate it. It's a 32h rim.
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Old 11-19-07, 11:35 PM   #2
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Hmm. I'm seeing 288.4 and 287.2, using spocalc. You should be ok. Did you lace it 3x?

Lucky for me, I'm about to order spokes for a PowerTap build

[EDIT] I just used the DT Swiss calculator too, and came up with 288.4 and 287.2, again. So two calculators are in agreement.

It really sounds like you might have laced it 2x or something.

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Old 11-19-07, 11:50 PM   #3
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So, when you say "the tension was all wonky," I initially read that as "floppy." What kind of tension difference are we talking about here? About a 25% difference would be pretty normal.
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Old 11-20-07, 04:21 AM   #4
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Originally Posted by waterrockets View Post
So, when you say "the tension was all wonky," I initially read that as "floppy." What kind of tension difference are we talking about here? About a 25% difference would be pretty normal.
At least 50%. I'm sure it's 3x.

Hrmph, when I would bring the tension up on the NDS, the wheel would come out of dish. Any ideas?
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Old 11-20-07, 08:21 AM   #5
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You know what? I just went out to the garage to measure every rear road wheel in there, and most of them are showing a >50% tension difference. TP-1 showing 23 DS and 14 NDS, probably the most common reading.

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when I would bring the tension up on the NDS, the wheel would come out of dish. Any ideas?
So this definitely means you don't have a spoke length issue. If the NDS spokes were too long, you wouldn't be able to tighten them any more, due to running out of threads. Also, with the same length on NDS and DS, the DS spokes would be the ones to be too long, not the NDS.

So, I think you've actually got a healthy wheel there. Did you get the DS tension up to 110kgf? If it's pretty even (<5% variance) all the way around the DS, I think you're good to go. Just make sure there aren't any wild variances on the NDS.
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Old 11-20-07, 08:43 AM   #6
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You know what? I just went out to the garage to measure every rear road wheel in there, and most of them are showing a >50% tension difference. TP-1 showing 23 DS and 14 NDS, probably the most common reading.



So this definitely means you don't have a spoke length issue. If the NDS spokes were too long, you wouldn't be able to tighten them any more, due to running out of threads. Also, with the same length on NDS and DS, the DS spokes would be the ones to be too long, not the NDS.

So, I think you've actually got a healthy wheel there. Did you get the DS tension up to 110kgf? If it's pretty even (<5% variance) all the way around the DS, I think you're good to go. Just make sure there aren't any wild variances on the NDS.
+1 110 - 115 Kgf on the Drive side and even tension with all the other spokes on the same side - you should be ok.
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