i have a bike, it is quite old, the BB cannot be switched out (non standard size in todays world) and it is a one piece chainring and crank combo. keep this in mind before suggesting i use chainring spacing bolts or get a new chainring/crankset.

i recently bought a fixed gear wheelset and it is coming in the mail (the original wheelset was a coaster brake wheelset) now i just realized the rear dropouts of the bike are either 110mm or 114mm can't measure exactly cause i haven't taken off the wheel off, while the new wheelset is 120mm hub. the frame is steel and was always planning to coldset/bend the rear stays to fit the wider hub. thought it would be easy and overlooked the chainline problem.

now without the wheels in hand yet, the chainline will be off by 5mm to 3mm depending on the rear dropout width, will this be ok? i was thinking either let it be, or asymetrically spread the dropout so to get a better chainline. or are there other solutions?