I'm helping a friend build up a frame with better parts. She's got a Traitor Ruben Flatbar, and we're converting to SS with a CK ISO SS Rear hub. My friend's going to go with 170mm cranks, so we should have a good pick of brands - but what will work best for converting to SS/fixed (straight chain line with stay clearance)?

Suggestions for cranks would be great! (the BB relies on spindle diameter - we're going with the one that fits: Threadfit 24, but what conversion kit we get is dependent upon the spindle, #8 for 24/22, #9 for 24) I'm assuming 24mm is what we'll be looking for, since the 22/24 is stepped for two chain rings, right? If any 24mm cranks will work, then I'm asking a very stupid question...

Ruben Specs: https://www.traitorcycles.com/2015/Bikes_RubenFlat.cfm?Token={ts_2015-07-29_11:17:05**-1744c5f8e2fa3034-967F28C5-D0A0-1B02-C836A2168C52B582

Thanks in advance!