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Discussion Starter · #1 ·
I compared the results between wheelpro.co.uk and bikeschool.com regarding the spoke length for the ff : mavic xm719 disc rim 32 hole with ERD 540 and Chris King ISO QR 32 hole disc hubs

wheelpro = 265 mm
bikeschool = 260mm

so...which result should i go for then before i start building my wheelset?..many thanks!
 

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mountainjoo said:
I compared the results between wheelpro.co.uk and bikeschool.com regarding the spoke length for the ff : mavic xm719 disc rim 32 hole with ERD 540 and Chris King ISO QR 32 hole disc hubs

wheelpro = 265 mm
What did you do to arrive at that length? Perhaps looking at the 28 hole version?
 

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Discussion Starter · #4 ·
roger-m said:
What did you do to arrive at that length? Perhaps looking at the 28 hole version?
nope. they have the CK ISO measurements ready as well as the rims. I just supplied the rim's ERD and pressed the calculate button...and that's what the calc gave me. hence the query on the conflicting results.
 

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mountainjoo said:
nope. they have the CK ISO measurements ready as well as the rims. I just supplied the rim's ERD and pressed the calculate button...and that's what the calc gave me. hence the query on the conflicting results.
But what did you input for the number of crosses? RogerM wrote the WheelPro spoke calculator and this is why he doesn't understand your final figure.
Edit - I see that Roger's spoke calculator gives lengths for all spoke crosses. What cross did you choose?
 

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Just to point out the obvious, this is why I always run my spokes length calcs through at least two calculators. In the event of a discrepancy between two "opinions," I call for a third doctor, but I also assume I made an entry error and re-run the numbers. It's normal to have a little variance, but once you're into the whole millimeter territory, something needs looking into.
 

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Speedub.Nate said:
Just to point out the obvious, this is why I always run my spokes length calcs through at least two calculators. In the event of a discrepancy between two "opinions," I call for a third doctor, but I also assume I made an entry error and re-run the numbers. It's normal to have a little variance, but once you're into the whole millimeter territory, something needs looking into.
I usually use three to double (triple?) check as wrong length mailorder spokes would be too much to bear.
 

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FWIW--I use the DT Swiss online calculator. I've built 25+ wheels using it's calculations, not one spole length issue. I use to have a cool Excel spread sheet spoke calculator, but the DT one gave me the same results and was a little easier to use.
 

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Speedub.Nate said:
Just to point out the obvious, this is why I always run my spokes length calcs through at least two calculators. In the event of a discrepancy between two "opinions," I call for a third doctor, but I also assume I made an entry error and re-run the numbers. It's normal to have a little variance, but once you're into the whole millimeter territory, something needs looking into.
I just use one (DT Swiss) and input my own data. I have learned how it "works" for me and results have been 99.9% good.

Adding results from other sources could just be confusing.
 

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mountainjoo said:
nope. they have the CK ISO measurements ready as well as the rims. I just supplied the rim's ERD and pressed the calculate button...and that's what the calc gave me. hence the query on the conflicting results.
How'd you come up with the ERD? Measuring or ? Why did you need to supply the ERD if the database had the rim? Mavic's measurements can be an issue...
 

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sounds like garbage in, garbage out. you need to make sure you input the exact same values into each calculator. 5mm is a mile in spoke length.
 

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Bikinfoolferlife said:
Mavic's measurements can be an issue...
Yeah, that one has bit me before. Mavic lists spoke bed diameter instead of ERD. Either measure actual ERD (good practice anyhow), or add 3mm to Mavic's published numbers (the height of two nipple heads).
 

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Monte said:
sounds like garbage in, garbage out. you need to make sure you input the exact same values into each calculator. 5mm is a mile in spoke length.
+1.
 
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