I have a Zipp 404 FC rear wheel that I'd like to rebuild with a Powertap G3 hub.
Original Zipp build - 523.5 ERD, 35.5 NDS spacing, 19.5 DS spacing, 47.5 NDS flange diam, 56.5 DS flange diam. The stock wheel is built 2-cross on NDS and radial on DS. This results in 8.0 and 4.8 degree bracing angles respectivley (60% tension ratio).
What I want to do is re-use the rim with a Powertap G3 (38.5/17.4/57/57) and keep the same lacing pattern. This would result in bracing angles of 8.6 and 4.3 respectively (50% tension ratio). The alternative would be to use 2x on both sides which would result in a worse DS bracing angle of 3.9 and a tension ratio of 46%. Given that Zipp recommends an upper tension limit of 100kgf, I would like to preserve as much NDS tension as possible (as well as DS stiffness).
Now, I already contacted Saris/Cycleops about the feasibility of this radial-DS lacing with their hub and they said that although they recommend at least 2x both sides, the DS can be laced radial and they have not seen any issues related to radial lacing the DS.
Has anybody else done this and am I correct in assuming to calculate spoke lengths I first enter the data as if I am building 2x, take the NDS length, then re-enter the data as if I am building 0x and take the DS length?
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