I'm finally going to try my hand at wheelbuilding. Since this is my first build I'm not entirely confident in the calculations I used to get spoke length. I'm getting some Mavic Open Pro rims and using a set of 36 hole Shimano 600 hubs that were made in 1985. The wheels will be 3 cross using DT Swiss DB Competition spokes.
The E.R.D. I found for the Open Pros is 602
Rear Hub
Here are all the measurements I came up with for the rear hub:
Spoke hole size= 2.5mm
Hub Flange Diameter= 45mm
O.L.D.= 126mm
Left locknut to center of left flange= 25mm
right locknut to center of right flange= 44mm
Left hub center to flange center= 38mm
Right hub center to flange center= 19mm
Using this calculator
http://www.bikeschool.com/spokes/ I came up with these lengths:
Spoke length left side 291.5 (292)
Spoke length right side 289.8 (290)
So I'm assuming that a length of 291mm would work for both sides of the wheel, correct?
Front Hub
The front hub was much easier but I'll include the figures anyway just in case:
Spoke hole size= 2.5
Hub flange diameter= 38
O.L.D.= 100
Left locknut to center of left flange= 14
Right locknut to center of right flange= 14
Left hub center to flange center= 36
Right hub center to flange center= 36
Using the calculator I came up with a spoke length 292.9 (293)
Does all that look about right?
My next question- Could I get away with using a length somewhere in between that would work for both wheels or should I get different lengths for each wheel?
Thanks in advance for any help/advice you can give.
