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Disc? Rim brake? Single speed/fixed? It might be likely that a non offset disc brake build would only use two lengths, mine did for bitex CL to 650b WTB Koms.
Other question is why? Max youd have to carry is 8 spokes, 2 for every differing length. If you need more than that the wheel hasn't been built properly. Plenty easier ways to lose weight if thats what youre chasing
Turkish-
Disc/geared. Yeah I suppose you're right, it's not a huge practical advantage. I just like the idea of buying/carrying one set of spokes rather than four sets that are going to get mixed up and cost more. The Marin 4 Corners has the wheels built with only one spoke length and it seemed like a good idea. If it requires expensive hubs that I can't get easily then I won't bother.
frankenbike
Say I wanted to build a wheelset with all spokes the same length so that I only need to take a couple of spares - what hubs/rims do I need? I'm guessing they have to be offset rims?