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Old 03-10-09, 12:04 AM   #1
burtsbees
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What spoke lengths do I need?

What spoke length do I need for a Chorus 32 spoke hubset matched to Mavic Open Pros. 3X pattern, double-butted Wheelsmiith spokes. What would the front length be and the rear drive and non-drive? I am totally confused by those spoke calculators.
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Old 03-10-09, 12:10 AM   #2
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Try spocalc, maybe the interface will be less confusing. Most spoke calculators have pull down menus that will have your hubs and rims included. You really ought to figure this out as it's part of the wheelbuilding process. Spoke brand is moot, just the length is important.
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Old 03-10-09, 10:47 AM   #3
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Hi,

First of all, I'd also recommend to double check everything with a calculator, but here are the numbers for a similar build.

I assume that your hubs are the models FH-02 and HB-02 because newer hubs seem to be labeled either Centaur or Record, not Chorus. I used the following for my wheelset:

Rims: Mavic Open Pro 36h
Hubs: Record FH-02 & HB-02 36h (should be equivalent to Chorus FH-02 & HB-02)
Front spokes: Revolution 2.0/1.5 mm, 294 mm, 3x
NDS spokes: Revolution 2.0/1.5 mm, 292 mm, 3x
DS spokes: Competition 2.0/1.8 mm, 290 mm, 3x
Nipples: 12 mm

There shouldn't be a big difference between 32h and 36h. The rear spokes had a decent tension when they were tightened enough to make the threaded part disappear inside the nipples so you could probably get away with longer spokes in the rear (or also shorter in the front).
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Old 03-10-09, 12:31 PM   #4
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I have the Spokecalc spreadsheet made by Damon Rindard. I found it on-line a while ago, and so far it's worked great. Never a problem. There may be a more up-to-date version out there, but if you would like me to email you this file (it's an Excel spreadsheet) send me a PM with your email address on it and I'll send it your way.

I don't know which generation Chorus you're using, but using my best guess it looks like you'll need 296 or 297 front (spokecalc comes up with 296.5), rear drive side is 294 while non-drive side is 296. You'll want to double check this before you go buying spokes, of course; perhaps by taking a caliper and confirming the dimensions in the Spokecalc spreadsheet.

By the way, these are the same lengths as needed using Shimano DA hubs.
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Old 03-10-09, 12:55 PM   #5
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Try this spoke-calculator. Quite possible the simplest:

http://lenni.me/edd/

And start reading here:

http://sheldonbrown.com/wheelbuild.html
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Old 03-10-09, 09:23 PM   #6
burtsbees
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My Chorus hubs are from 2002, the discontinued line. I used the simple spoke calculator provided by Panthers007 and they matched exactly with eofelis' numbers with Spokecalc. Thanks everyone!
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Old 03-11-09, 08:54 AM   #7
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Quote:
Originally Posted by ärjy View Post
Hi,

Rims: Mavic Open Pro 36h

There shouldn't be a big difference between 32h and 36h.
There is actually significant difference between 32h and 36h builds, all other factors being the same.

Assuming the hub measurements are the same, just put 36 in the calculator where you enter number of spokes.

Also, you're not looking for the threads to dissapear into the nipple hubside, but for the spoke to rise up to the inside of the flats at the head of the nipple.

Go here and measure your hubs. This will help you understand the calculator. Your rim erd is 602.
http://sheldonbrown.com/rinard/spoca...asureHubAndRim

Download the spocalc excel spreadsheet from the same page. You might be able to find your hub in the database there, but best to measure to make sure it looks to match your own measurements:
http://sheldonbrown.com/rinard/spocalc.htm

Last edited by krems81; 03-11-09 at 08:58 AM.
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Old 03-11-09, 10:18 AM   #8
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Quote:
Originally Posted by krems81 View Post
There is actually significant difference between 32h and 36h builds, all other factors being the same.
Thanks for pointing this out. I should have checked this before giving incorrect advice. You can use shorter spokes with 36h than with 32h.
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