Does off-center drilling affect spoke length?
07-26-21, 05:25 PM
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Does off-center drilling affect spoke length?
The wheels I'm going to be building for the 650B conversion of my '85 League Fuji are shaping up as follows:
Velo Orange hubs. (Just bought the cloesout 126mm freewheel rear hub, smoking deal for 45 bucks.)
Velocity A23 rims, OC rear / normal front.
36 spokes, 4x. I'm a big dude and the roads up here in Humboldt County suck. (If the high-flange hubs won't work with 4x, I'll go 3, but I prefer cross-4 on a 36-spoke wheel... more tangential, longer spokes, seems mo' betta.)
Thing is, I can't find an online spoke calculator that has all of those parts in its database, and the offset drilling on the rear wheel is weirding me out. It's gotta change spoke length, no? But none of the calculators I've looked at have a way to indicate that the rim is asymmetric. Does that actually matter?
--Shannon
Velo Orange hubs. (Just bought the cloesout 126mm freewheel rear hub, smoking deal for 45 bucks.)
Velocity A23 rims, OC rear / normal front.
36 spokes, 4x. I'm a big dude and the roads up here in Humboldt County suck. (If the high-flange hubs won't work with 4x, I'll go 3, but I prefer cross-4 on a 36-spoke wheel... more tangential, longer spokes, seems mo' betta.)
Thing is, I can't find an online spoke calculator that has all of those parts in its database, and the offset drilling on the rear wheel is weirding me out. It's gotta change spoke length, no? But none of the calculators I've looked at have a way to indicate that the rim is asymmetric. Does that actually matter?
--Shannon
07-26-21, 05:31 PM
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Sure it matters but only by a few tenths of a mm. One could shift the flange to center by the rim's offset amount to get an exact length. Andy
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AndrewRStewart
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07-26-21, 05:51 PM
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Expect the length to change about 10% of the offset.
https://www.sheldonbrown.com/rinard/spocalc.htm
has a cell to enter offset.
https://www.sheldonbrown.com/rinard/spocalc.htm
has a cell to enter offset.
07-26-21, 05:57 PM
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--Shannon
07-26-21, 05:58 PM
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Those are very nice looking hubs! Freewheel for a big guy is a bold choice but hopefully axles are stronger now than BITD. If you could find some, Pacenti 650b rims would be another option.
07-26-21, 06:06 PM
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There is at least one E-Bay vendor of Sapim and other spokes that custom cuts them to he nearest 1mm.
I prefer to do my own measurements of ERD and hubs. I'm trying to remember if my spoke calculator included "offset", but I like Andrew's suggestion of simply shifting the flanges to the DS slightly for the calculations.
07-26-21, 06:38 PM
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https://www.velocityusa.com/product/rims/a23-oc-650b
