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They should all use the same width hubs.
7 and 8-speed cassettes use the same width gears and chains, but 9-speed gears and chains are narrower. So you should be able to switch to an 8-speed rear-end (cassette, shifter, derailleur) without changing chainrings.
Old C-dales are cool... got any pictures?
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Graham
1984 Carrera Targa
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