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Given its 90s, measure the OLD between the dropouts; maybe it's 130 already, and if the hub isn't pulling the frame together by 4mm you should be golden if there's a couple of spare mm on the DS spacing. 7s would have been the cheap seats in the 90s, so maybe it's easily upgradeable.
Otherwise you'll need to add some OLD to the hub and some dish to the wheel; you can probably get away without cold-setting but best to bother for the sake of the bearings and axle.
Kimmo
@velohobbit
Looking to replace the very worn shimano MF HG20 on my 90s Raleigh. Apologies for ignorance, wondering if popping on a 9 Speed 13 32T which is also screw on will cause problems, or add value. I've no problem with the current gear range, but I'd like to get my wife on it and the extra range will give her confidence I think. My first thought is dishing or generally increasing the OD and needing to cold space the rear?