Join Date: Sep 2008
Location: Linton, IN
Bikes: 1977 Bridgestone Kabuki Super Speed; 1979 Raleigh Professional; 1983 Raleigh Rapide mixte; 1974 Peugeot UO-8; 1993 Univega Activa Trail; 1972 Raleigh Sports; 1967 Phillips; 1981 Schwinn World Tourist; 1976 Schwinn LeTour mixte; 1964 Western Flyer
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THe advantage of going 7 over 6 is that you have one more gear. Plus, it's easier to get a super wide spread with a 7 speed freewheel than with 5 or 6.
Also, remember, if you stick with friction (I'd go bar-ends, since your'e upgrading everything), you can use any derailer with any crankset or freewheel, as long as it'll physically take the number of teeth you're giving it. I'd upgrade with 105 everything, if I were you.