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Join Date: Jun 2021
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Bikes: '38 Schwinn New World, ’69 Peugeot PX-10, '72 Peugeot PX-10, ‘7? Valgan, '78 Raleigh Comp GS, ’79 Holdsworth Pro, ’80 Peugeot TH-8 tandem, '87 Trek 400T, ‘7? Raleigh Sports, ‘7? Raleigh Superbe, ‘6? Hercules
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First things first..... You need to quickly make enough posts so that you can upload photos!
The crankset determines BB spindle length (usually.....), so if you're keeping the cranks, get a BB with the same spindle length. It's possible the length is embossed on the spindle that's in there. And if you haven't dismantled the BB, maybe a cleaning and new bearings/grease are all you'll need.
If the rear hub is 126mm you should be able to fit a 7sp freewheel. But since it's got a 5sp on there, it's more likely that it's 120mm. If it's 120mm, you could fit a narrow 6sp.... Or spread the dropouts to 126mm, get a longer axle and spacers to make the old hub 126mm (you'll have to re-dish the wheel), or build up a new wheel with a 126mm hub.... Then you can use a 7sp.