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Does off-center drilling affect spoke length?

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Does off-center drilling affect spoke length?

Old 07-26-21, 05:25 PM
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ShannonM
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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
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Old 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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Old 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.
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Old 07-26-21, 05:57 PM
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Originally Posted by Andrew R Stewart View Post
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
That makes sense. We can't buy fractional spoke lengths anyway, so maybe this is a distinction without a difference? MIght explain why Velocity's website doesn't list an offset dimension for this rim.

--Shannon
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Old 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.
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Old 07-26-21, 06:06 PM
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Originally Posted by ShannonM View Post
That makes sense. We can't buy fractional spoke lengths anyway, so maybe this is a distinction without a difference? MIght explain why Velocity's website doesn't list an offset dimension for this rim.

--Shannon
It is hard to get your spoke estimate closer than 1mm.

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.
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Old 07-26-21, 06:38 PM
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Originally Posted by ShannonM View Post
That makes sense. We can't buy fractional spoke lengths anyway, so maybe this is a distinction without a difference? MIght explain why Velocity's website doesn't list an offset dimension for this rim.

--Shannon
3mm per this- Just above "here's a video........
https://www.velocityusa.com/product/rims/a23-oc-650b
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