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What about 15x110mm? Closer to 120. Just didn’t know whether the chain line is different
If you're adding to the OLN, it doesn't matter whether it's +10mm or +20mm (or even more for converting old road frames)
Native chainline on a 15×100 is 41.5mm, so you don't really have to do anything if you're using track cranks, but you can slide the hub to the right to get a 47mm chainline to go with road cranks and that usually makes the spoke bracing angle symmetrical, or at least closer than it was.
15×110 works well with road cranks, it's natively 46.5mm chainline so your conversion is symmetrical (I've got a factory Boost wheel in my 464, no re-dishing required), but with track cranks you'd have to move the hub to the left and you lose the main point of Boost hubs.
What about 15x110mm? Closer to 120
Stupid question that one. (More so than usual)
Just didn’t know whether the chain line is different