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Drew it out tonight so I could visualize it. NDS 1x using 8 holes is simple; calculate spoke lengths per 16 spoke rim and hub, 1x. DS 3x using 16 holes gives leading and trailing spokes the same length, 2.38 effective cross. The NDS 1x pattern using 8 holes gives close to tangent angles leaving the hub, which is what we need to take up the PT hub torque on that side.
Here are my calculations using Damon Rinard's spocalc, and the decimal cross count from DR/AEO's spreadsheet.
Rim: Gigantex 50mm clincher, hidden nipples, ERD 563. Hub, PT-SL, WL 31.8, WR 18, flange diameter 70.
NDS: 16 h rim 1x, 258.5 length
DS: 24 h rim 2.38x, 263.2 length
Can anybody confirm this? Thanks!
Edit: Note what the spoke lengths imply: the exit angle leaving the hub is higher than a traditional 32 spoke 2x pattern on both sides (obvious from the 2.38 cross number on the DS, not so obvious from the "1x" on the NDS). As AEO mentions above, the spoke tension should be much closer left/right also. I searched for a spoke calculator that would give exit angles and spoke tensions, but didn't find one. If I build it, I'll take pictures and measure tension.
Last edited by KendallF; 01-17-10 at 10:37 PM.