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Determining spoke length?

Old 04-22-19, 11:30 PM
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Determining spoke length?

Looking to build my first set of wheels but I'm not really sure about spoke length. Gonna be DA-7600 28h to TB14
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Old 04-23-19, 12:06 AM
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spocalc.xls
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Old 04-23-19, 01:55 AM
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https://leonard.io/edd/

It's always best to verify measurements even if there are user submitted dimensions
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Old 04-23-19, 03:35 AM
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Originally Posted by ThermionicScott View Post
spocalc.xls


indeed
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Old 04-23-19, 08:49 AM
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Originally Posted by hairnet View Post
https://leonard.io/edd/

It's always best to verify measurements even if there are user submitted dimensions
That's what I was looking for.. a database with the measurements
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Old 04-23-19, 09:57 AM
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Now, is there a way to tell if these hubs were laced 2x or 3x previously? I'm assuming they were done 2x
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Old 04-23-19, 10:49 AM
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Originally Posted by ceelint View Post
Now, is there a way to tell if these hubs were laced 2x or 3x previously?
Not really. You could probably do either one. 3x will generally give you a slightly stronger wheel, but 2x is fine as well.
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Old 04-23-19, 11:17 AM
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Originally Posted by ceelint View Post
Now, is there a way to tell if these hubs were laced 2x or 3x previously? I'm assuming they were done 2x
Picture isn't working for me.
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Old 04-23-19, 11:27 AM
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Originally Posted by ThermionicScott View Post
Picture isn't working for me.
😁

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Old 04-23-19, 11:28 AM
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There's also this calculator: https://online2.qbp.com/spokecalculator/

Which you can use to verify the numbers from Edd.
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Old 04-23-19, 11:30 AM
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I went to https://www.prowheelbuilder.com/cw/ and got the measurements for the spokes when I built Archetype with Bitex rar/raf12... and bought somewhere else....
The TB14 is there, but you don't have DA7600 hub...
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Old 04-23-19, 11:30 AM
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Will the rear hub being single fixed affect anything?

It doesn't center up like a fixed/free or fixed/fixed hub does
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Old 04-23-19, 11:37 AM
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Prowheelbuilder had the DA high flange track hub aka HB7600, just not a 28h
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Old 04-23-19, 11:37 AM
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Spocalc is already somewhat a library. I just add to it when necessary.



You might be able to tell if those were 2 or 3 cross based on the angle which the spoke grooves are formed, coming out of the spoke holes. To me, based on your photo it looks like the crossings were different for front and rear. Maybe 2 and 1, or 3 and 2.
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Old 04-23-19, 11:53 AM
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My main concern is the single fixed.. looks like it may need to be dished slightly
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Old 04-23-19, 12:08 PM
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Originally Posted by ceelint View Post
Will the rear hub being single fixed affect anything?

It doesn't center up like a fixed/free or fixed/fixed hub does
The rim should center directly in the middle of the hub. The hub flange R/L distances in relation to this middle point is what you will base your spoke lengths on and will also be the center point for the rim. Spoke hole diameter on the flange (on which diameter the spoke holes sit) is also a critical measurement in determining your spoke lengths. The actual spoke hole diameter is also necessary but not so critical.

The first build is a bit of stress. It gets easier.
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Old 04-23-19, 12:10 PM
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You can see that the rear hub doesn't center the way the front does



This is about centered.. slightly off
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Old 04-23-19, 12:11 PM
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Originally Posted by ceelint View Post
My main concern is the single fixed.. looks like it may need to be dished slightly
I have only built 10 speed wheels but pretty much would expect the right flange of a fixed gear bike to also sit closer to center-mass and therefore require shorter spokes for the drive side.
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Old 04-23-19, 12:12 PM
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Yep. The DS spokes will be shorter by a bit.
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Old 04-23-19, 12:18 PM
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According to Spocalc, for the DA High Flange hubs, the DS flange sits 11mm closer to center mass than the NDS flange. It does not indicate whether these are the DA HB-7600's, so you will have to measure or get the measurements from a known good source.
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Old 04-23-19, 12:53 PM
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Originally Posted by ceelint View Post
My main concern is the single fixed.. looks like it may need to be dished slightly
"Slightly" is the key word there. You should be able to use the same spoke length for both sides, and the tension imbalance won't be too bad.

Since these hubs have been laced before, it would be good to make sure that you lace leading and following spokes into the same places they were before. As long as you do that, going from 2x to 3x or vice versa shouldn't pose a concern.


P.S. I think @pressed001 is on the right track with the number of spoke crossings. Rear impressions look pretty tangential, while the fronts are a little less so. Maybe 2x in front and 3x in rear? The front may have already been laced more than one way, it's hard to tell.
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Old 04-23-19, 01:51 PM
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Ok.. did some more searching and got the measurements

Front:
Center to flange - 34
Flange dia - 67

Rear:
Center to left flange - 41
Center to right flange - 30
Flange dia - 67

Rim:
ERD - 610
OSB - 0

Seem about right?
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Old 04-23-19, 02:10 PM
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Figured the spoke length out.. thanks a ton guys. Any suggestions on spokes now?

I float around 200lbs so I'll probably go 2x front and 3x rear

Front:
2x: 286 l&r
3x: 300 l&r

Rear:
2x 287 left/ 286 right
3x 301 left/ 300 right
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Old 04-23-19, 03:54 PM
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I built it with Sapim Laser and brass nipples for 20 front and 24 rear and very happy with the wheels. I am at 140 lbs.
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Old 04-23-19, 09:50 PM
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Originally Posted by ceelint View Post
Ok.. did some more searching and got the measurements

Front:
Center to flange - 34
Flange dia - 67

Rear:
Center to left flange - 41
Center to right flange - 30
Flange dia - 67

Rim:
ERD - 610
OSB - 0

Seem about right?
Always good to measure what you have before ordering spokes. There is disagreement online about the correct ERD for those rims, and whether a given measurement includes the head of the spoke nipple. Sometimes parts vary from lot to lot, as well.
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