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Spoke length w/ Mavic CXP23 rim(6 posts)

Spoke length w/ Mavic CXP23 rimEric
Dec 18, 2001 10:07 AM
I have a pair of wheels which came with my CX bike, built with Mavic CXP23 rims. These are an OEM rim which look a lot like the CXP33. Unfortunately, the wheels were built using cheap no-name spokes and while they have survived a surprisingly long time, I am now getting into breakage. I am going to re-build the wheels with some good old 14/15/14 DT spokes.

I have used Damon Rinard's spocalc spreadsheet with success before, but this CXP23 rim is not in his database. The CXP33 is there, and the ERD is listed as 600. It's a longshot, but has anyone actually measured a CXP23 rim?
Old Fashionedgrzy
Dec 18, 2001 12:43 PM
You should just do it the old fashioned way to be safe - get out the calipers and measure all of the critical dimensions then plug it into a spoke program. Brandt, amoung others have the formulas for figuring out spoke length for any configuration - it's just math. Otherwise a decent bike shop can give you the number. What's wrong with simply measuring a spoke or using the spoke ruler to measure the required length if you think your spokes have strecthed - I'm under the impression that the rim and hub are not changing.
Easy way outEric
Dec 18, 2001 12:56 PM
I agree, I should just measure it all but I was going on the hope that someone might already know. I'm pretty sure the length will be 294 for the front. Since I just broke a front spoke on Sunday I will just replace it with a 294 before tearing the wheel down. Then I'll know exactly what length of spoke I need! The lazy man's way of spoke sizing....
ERD for a CXP 23 is 599mmJS
Dec 18, 2001 1:08 PM
Go to the DT swiss website, they have a new spokecalc program (at bottom of english page) that does all the work for you, it even lists the CXP 23.
Park's database has been wrong, though.jw25
Dec 20, 2001 12:09 PM
The program itself works, but from other posts here, it seems like the information they list isn't correct.
The best way (assuming the current spokes use most or all of the nipple threads) is to measure one or two of each spoke set. Spokes don't really stretch in use, and even if they're elongating due to fatigue (well, they are starting to go, so it's an outside possibility), the extra length should be under a mm.
The CXP-23 and CXP-33 look to use the same extrusion, but the 33 uses eyelets, which would account for the 1mm difference another poster cited. Still good rims, and respoking is faster than rebuilding.
Have fun.
Yeesh - meant DT, not Park. Need more sleep... nmjw25
Dec 20, 2001 12:10 PM
nm