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Spoke length for Mavic Open Pro vs Mavic CXP33
Assuming the same lacing pattern for each rim, I'm guessing that the
spoke length will be different due to the aero profile of the CXP33. Is that correct? Thanks. -- Marty |
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Spoke length for Mavic Open Pro vs Mavic CXP33
Marty wrote:
Assuming the same lacing pattern for each rim, I'm guessing that the spoke length will be different due to the aero profile of the CXP33. Is that correct? According to Spocalc: CXP33: ERD = 596mm Open Pro: ERD = 605 mm. From that you can calculate the required spoke lengths based on the number of spokes, cross pattern, and hubs used. Art Harris |
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Spoke length for Mavic Open Pro vs Mavic CXP33
On Sep 24, 10:24*am, Marty wrote:
Assuming the same lacing pattern for each rim, I'm guessing that the spoke length will be different due to the aero profile of the CXP33. Is that correct? Thanks. -- Marty DT has a spoke length calculator on their site, so does Sapim, and you can download Spocalc, an excel macro for the same task. Be forewarned tho, some say the values (OLD, etc...) provided with the macro can be wrong, which can result in up to a .5 mm difference in the calculation! Horrors! D'ohBoy |
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Spoke length for Mavic Open Pro vs Mavic CXP33
On Sep 24, 11:24 pm, Marty wrote:
Assuming the same lacing pattern for each rim, I'm guessing that the spoke length will be different due to the aero profile of the CXP33. Is that correct? Yes, by a good bit. I built up one 4x with some long spokes intended for an OP type profile in order to take up the slack on one side. Whooboy--ugly, not recommended, as I crossed the heads....but whaddaya gonna do on a Sunday? At any rate, just plug your stuff into spocalc: http://www.sheldonbrown.com/rinard/spocalc.xls and you'll get your figgern done for you. You'll need a spreadsheet proggie. Any one will do that opens basic MS stoff. I use Gnumeric, but Openoffice.org or Staroffice works great. |
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Spoke length for Mavic Open Pro vs Mavic CXP33
On Sep 24, 11:24 am, Marty wrote:
Assuming the same lacing pattern for each rim, I'm guessing that the spoke length will be different due to the aero profile of the CXP33. Is that correct? Thanks. -- Marty Damon Rinard's SpocCalc says ERD's are 598 vs 605 Check it out for yourself at "http://www.sheldonbrown.com/rinard/ spocalc.htm" MW |
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Spoke length for Mavic Open Pro vs Mavic CXP33
On Sep 24, 2:06*pm, The Wolff Den wrote:
On Sep 24, 11:24 am, Marty wrote: Assuming the same lacing pattern for each rim, I'm guessing that the spoke length will be different due to the aero profile of the CXP33. Is that correct? Thanks. -- Marty Damon Rinard's SpocCalc says ERD's are 598 vs 605 Check it out for yourself at "http://www.sheldonbrown.com/rinard/ spocalc.htm" MW Art, D'oh, Landotter, and Wolff, Thanks!!! -- Marty |
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Spoke length for Mavic Open Pro vs Mavic CXP33
D'ohBoy skrev:
DT has a spoke length calculator on their site, so does Sapim, and you can download Spocalc, an excel macro for the same task. Be forewarned tho, some say the values (OLD, etc...) provided with the macro can be wrong, which can result in up to a .5 mm difference in the calculation! Horrors! I think that there are two issues he Regarding the 0.5 mm discrepancy, then it can be caused by whether the spoke calculator gives raw geometric values or whether it subtract a small 0.5 mm fudge factor from the final results. The 0.5 mm number stems from wheelbuilder Roger Musson who claims that standard swaged spokes elongate and rims compress when under tension and that 0.5 mm is a good fudge factor to use for this phenomenon. So his spoke calculator subtract this number from the final results: http://www.wheelpro.co.uk/spokecalc/ I am pretty sure that Spocalc gives the raw numbers, anyway it just uses macros so its internal workings are fully accessible for those who want to check how its results are calculated. The online spoke calculators from DT Swiss and Sapim are black boxes that just spits out results without telling how they reached it. The other issue is that there may be errors in the Spocalc database, which may results in deviations far larger than 0.5 mm. Mavic are using the term "Spoke Support Diameter"(SSD) which isn't identical with ERD. The SSD for the CXP33 is 595 mm. People sometimes confuses this number with ERD like this vendor: http://www.starbike.com/php/product_...ng=en&pid=1625 Other uses the 598 mm number that can be found in the Spocalc db that claims that the ERD for a Mavic CXP33 is SSD + 3mm = 598 mm. http://www.wheelbuilder.com/closeup....d=118&offset=0 The DT Swiss calculator claims that the CXP33 ERD is 599 mm. Allgemeiner Deutscher Fahrrad-Club e.V. says the ERD is 596 mm: http://www.fa-technik.adfc.de/Kompon.../Felge622.html According to my own notes I have measures the CXP33 ERD to be 596 mm too. So one can find a spread of numbers from 595 mm to 599 mm regarding the ERD of the Mavic CXP33. The spoke calculators results will of course wary depending of which number one uses. -- Regards |
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Spoke length for Mavic Open Pro vs Mavic CXP33
On Sep 24, 9:24*am, Marty wrote:
Assuming the same lacing pattern for each rim, I'm guessing that the spoke length will be different due to the aero profile of the CXP33. Is that correct? Thanks. -- Marty I use 597 for the CXP-33 and 603 for OpenPros...measured with Wheelsmith rods. |
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