Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,194
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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Time to examine the rear of this bike yourself, since we need to know what the inside width of your fram is now, without the wheel.
Then either measure the over-locknut width of the rear wheel and confirm the branding and # of speeds of the freewheel (or is it a cassette?).
You can judge the over-locknut width of the axle after measuring the inside of the frame, after putting the wheel in alongside the dropouts before any flexing takes place.
That's all, but pictures of the freewheel or whatever you've got will help a lot.
And, 5sp is usually about 120mm, while 8sp is usually 130mm, a big difference. Hence the need to measure the parts!