Join Date: Dec 2005
Location: Montpelier, VA
Bikes: The keepers: 1960 Raleigh Lenton Grand Prix, 1968 Ranger, 1969 Magneet Sprint, 1971 Gitane Tour de France, 1973 Raleigh Tourist, 1973 Lambert, 1973 Schwinn Super Sport, 2 - 1988 Rossins
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The best you're going to do with a freewheel and brifters is a 7-speed Shimano freewheel and Shimano RSX brifters. Granted, I'm talking theoretically, as I've yet to do the setup myself - but - the spacing on a 7-speed freewheels and 7-speed cassette are identical, if my memory is still working. You'd need to change over the derailleurs to RSX or something Shimano that's newer (there are a couple of exceptions, mainly old Dura Ace).
I'd seriously suggest digging up a 14-28 6-speed freewheel (I assume what you currently have is narrower), and drop your smaller chain ring a couple of teeth. Short of tree climbing with loaded panniers, that should do for general use.
"No wonder we keep testing positive in their bicycle races. Everyone looks like they're full of testosterone when they're surrounded by Frenchmen." ---Argus Hamilton