Originally Posted by you
How do I find the spoke length? should the spokes be different lengths for drive side and non-drive side? Or should the be different, thanks.
If you use SpoCalc, at least some of the common OC rims are already in the data base. I just looked and the Velocity Aerohead OC rim is in there. The spokes from the two different sides will not necessarily be the same length. OC(off center) rims reduce dish, they don't eliminate it.
SpoCalc is available free. You just need an app that will run Excel spreadsheets (eg. MS Excel or Star Office). You can download Spocalc from Sheldon Brown's site:
It's great for several reasons. First, it has a very large database of rims and hubs. It does all the math for you. Once you plug in the numbers it automatically calculates the spoke lengths for radial, 1x, 2x, 3x, and 4x lacing patterns. If you can run spreadsheets it's a great way to go. Even if your specific rim or hub is not in the database you can do all the entries manually and the calculations are still automated. There is a specific variable entry for OC rims. It is "O.S.B." This is the "lateral spoke bed offset (from wheel center). Non-zero for asymmetric rims".
If you can't get Spocalc up and running, I can run the numbers for you, but you will have to supply them for me. For the rim you need the OSB and the ERD. For the hub you need five different measurements. The best bet is to supply the specific model numbers for the rim and hub and see if they are already in the SpoCalc database.
I looked at the other two spoke calculators I have used (DT Swiss and Promechanics.com) and neither of them accounts for offset rims.
Does anyone know of some calculator (other than SpoCalc) that takes an O.S.B. variable?
Last edited by cascade168; 01-28-06 at 07:23 AM.