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margot_skidder
Wheels, if they were standard single speed rear hub and not a bastardised road geared hubs should be fine as steamroller is 120 mm at rear. According to surly the break reach is 47-57 mm so you need to measure yours but you may / should be ok. I am presuming surly use a standard recessed nut like your bike
Bottom bracket will depend on chain line on surly and what chain set you have. - probably your most fiddly problem!
Headsets are cheap unless it’s a quality one I would just get a new one