Originally Posted by
canyoneagle
There are several sites with spoke length calculators
http://lenni.info/edd/ being one with a pretty complete array of pre-specified rims and hubs. The DT Swiss site or others (UBI) will give you the option to manually plug in the data if your hub/rim do not show in the linked site.
You'll need the following data:
Rim ERD (diameter of rim measured from screwdriver slot of nipple to same spot on the other side of the rim) - this info should be available or your LBS can help measure it.
Hub Flange Diameter - info should be available in hub manufaturer tech data or on spoke calc site)
Hub flange distance from center (right and left) - same source as above
Spoke cross pattern
Some of the sites additionally ask for spoke hole diameter and nipple length, but the default values are typical and should return a reliable answer. Your LBS should be able to help you validate your calcs if you are unsure.
The thing is, the hubs and the rims are Specialized proprietary designs. For instance, the hubs have no brand marking on them at all. The rims are marked "SATURAE X28 26 X 1.50". Still, I'll check out the sites you mention.
I was thinking I'd measure the existing spoke size. Then adjust (reduce) that length based upon the measured difference in diameter of the hole patterns on the new and old hubs. Does that sound like it will work?
I have a good quality caliper and scale at home to make accurate measurements on the hubs and spokes. The scale (ruler) is graduated in 0.01" (0.25 mm) increments and is more than long enough to measure a spoke. The caliper is graduated in 0.001" increments for measuring the hole diameter on the hubs.