-
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.
15×100 hubs are very easy to convert