I've never used SED but if the only variable is the rim the spokes should shorten half the difference of the rims ERD. I would assume using SED would be the same. From the chart above that appears to hold true. So find your rims SED subtract from any SED in the chart and divide by 2. Subtract this number from the spoke length and you have your spoke length for you rim.

I'm not 100% sure how to convert ERD to SED but sounds like it adds spoke head, +3mm. However this is a total guess so adjust 330 ERD to SED correctly first.


530-333=197

250-(197/2)=151.5. <--- spoke length