Calculating spoke lengths for an offset Pugsley Fat bike wheel
Post date: Nov 28, 2013 3:55:51 AM
This table of correction factors for calculating fat bike wheel spoke lengths is published by Quality Bicycle Products. The complete table covers many of the QBP house brand frames but I only included the Pugsley numbers. As a practical example, here is how I calculated the spoke lengths for my offset Pugsley rear wheel with Shimano Zee hub and Surly Marge Lite rim.
[A] Left flange diameter 44.5mm
[B] Right flange diameter 45.5mm
[C] Left center-to-flange 33.5mm. Corrected per chart 28.5mm (33.5mm-5mm=28.5mm)
[D] Right center-to-flange 20.5mm. Corrected per chart 25.5mm (20.5mm+5mm=25.5mm)
Effective rim diameter 544mm. As always, measure your ERD. It’s especially important with these fat bike rims as I have found them to be "less round" than typical mountain bike rims.
I very carefully transferred these numbers into the spoke calculator at http://www.wheelpro.co.uk/spokecalc/.