Offset spoke holes and spoke length
06-20-11 | 09:25 PM
#1
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Offset spoke holes and spoke length
Let me say this is my first wheel build from scratch, first spoke calculating as well.
I'm stumped on the the whole spoke hole offset. So if I were to be calculating spoke length, would you say the offset in these spoke holes would need to be figured in to the calculation? It's a 40 hole Westwood style rim if that helps.
My initial guess is yes, but since I have zero experience I'm hoping someone here can help....
I'm stumped on the the whole spoke hole offset. So if I were to be calculating spoke length, would you say the offset in these spoke holes would need to be figured in to the calculation? It's a 40 hole Westwood style rim if that helps.
My initial guess is yes, but since I have zero experience I'm hoping someone here can help....
06-20-11 | 10:14 PM
#2
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
If you wanted to be an absolute purist or if the offset were considerable, you could subtract the amount of offset from the centerline from the flange to center distance.
But if you consider that the change in spoke length is only about 1mm for every 10mm of flange to center distance another millimeter or two more or less won't be enough to worry about anyway.
The only time I'd make the adjustment would be if I was using an offset rim where the spoke holes are moved left to reduce dish.
But if you consider that the change in spoke length is only about 1mm for every 10mm of flange to center distance another millimeter or two more or less won't be enough to worry about anyway.
The only time I'd make the adjustment would be if I was using an offset rim where the spoke holes are moved left to reduce dish.
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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.
06-21-11 | 03:52 AM
#3
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From: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
Manufacturers compensate for the offset by correcting their published ERD (Effective Rim Diameter). But, typically, offsetting the spoke holes, will only reduce the spoke length by a fraction of a mm.
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