Critique my wheel build, please.
03-30-16, 06:24 PM
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Critique my wheel build, please.
Okay, I'm guilty of the if it ain't broke fix it until it needs to be fixed syndrome and am trying to avoid doing it to my wheel build. Part of me feels the tension is a little high and can be balanced a little better and the other part is saying leave well enough alone...
Built new dynamo wheel Saturday using Sapim Race spokes a WTB ST i23 rim and a PD-8 dynamo hub and have just under 60 miles on it. Tonight I threw it back in the stand to check the build after a couple of commutes. Wheel true is fine I feel no need to finesse it at all. As stated above I feel tension could be tweaked a little more.
I plugged my TM-1 readings into the Park app, see link below.
Dynamo build | Park Tool
Built new dynamo wheel Saturday using Sapim Race spokes a WTB ST i23 rim and a PD-8 dynamo hub and have just under 60 miles on it. Tonight I threw it back in the stand to check the build after a couple of commutes. Wheel true is fine I feel no need to finesse it at all. As stated above I feel tension could be tweaked a little more.
I plugged my TM-1 readings into the Park app, see link below.
Dynamo build | Park Tool
Last edited by edthesped; 03-30-16 at 06:31 PM.
03-30-16, 10:12 PM
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Why are you here?
If anything, the tensions are pretty high for a front wheel, especially given the spokes used.
However, I wouldn't do anything about that now, except to use loosening more than tightening if/when I did any truing.
If anything, the tensions are pretty high for a front wheel, especially given the spokes used.
However, I wouldn't do anything about that now, except to use loosening more than tightening if/when I did any truing.
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WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 03-30-16 at 10:25 PM.
03-31-16, 05:17 AM
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Finally and perhaps most importantly I'm trying to learn nuances of wheel building as this is only the third wheel I have built and learn I did. I really need to thank you for pointing out the obvious, it's okay to wind down spokes when truing. It's now stupid obvious but never crossed my mind until you wrote it.
Thanks
03-31-16, 07:04 PM
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Agree with FBinNY here in-as-much-as, if it were me (and I tend to overthink things too 
) I'd wind it down a bit. Shouldn't be a big deal - maybe 1/4 - 1/2 turn all the way around.
) I'd wind it down a bit. Shouldn't be a big deal - maybe 1/4 - 1/2 turn all the way around.
03-31-16, 07:51 PM
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Since you asked, it does look like the tension is a smidge higher overall on the right side. You could check the centering, and if the wheel is biased to the right, there's your first opportunity to let out a little tension.
But I also agree with others that the wheel is probably just fine, and don't forget that the tension will drop a little once you've installed and inflated tires. Have you done all of the stress-relieving yet?
But I also agree with others that the wheel is probably just fine, and don't forget that the tension will drop a little once you've installed and inflated tires. Have you done all of the stress-relieving yet?
03-31-16, 07:53 PM
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The PD-8 is a disk brake hub that's slightly off-center to make room for the rotor.
03-31-16, 07:58 PM
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03-31-16, 08:04 PM
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The flanges aren't offset, though: https://www.sp-dynamo.com/8-series-pic/PD-8-QR-01.pdf
The flanges are symmetric, both 23.4mm from the center line although they vary in diameter - spokes holes are on a 58mm circle on the left and 52mm circle on the right.
That'd make the left slightly higher in tension when the rim is centered.
Last edited by Drew Eckhardt; 03-31-16 at 08:11 PM.
04-01-16, 11:06 AM
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The dish is maybe 1/2 mm off on one side. I think I'll try to loosen everything up a bit this weekend the weather is going to suck anyway.
04-01-16, 11:10 AM
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The damage of excess tension is immediate (if there is any) , so there's little benefit in loosening a wheel when finished. However since you want to dish the rim over, do so by loosening only the close side, and the other side will loosen by virtue of the rim moving closer.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
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