Originally Posted by
RapidRobert
I have an '82 Bruce Gordon framed 10-speed with a Campy Super Record crank and Suntour Perfect freewheel, and want lower gears. I've read about the Peter White conversion kit for adding a third chainring to this crank. Does anyone here have experience with it? I have a Suntour Cyclone GT rear derailleur to use, and the Campy Nuovo Record front derailleur should work too I think. Are there any alternatives to the PW system? Am I committing a sin by considering this?
I'm not sure what the "Peter White system" is, but maybe you mean a TA or Willow 42-tooth tripleizer ring? Those can work well, use a 74 BCD granny ring, and don't require any modification to your existing crank arm. You'll need about 5 mm of additional spindle on the drive side, although sometimes you can get away with less if the granny is small and/or your frame has a lot of 'indent' where the granny rings passes by the chainstay. Get the smallest Q-factor you safely can (would be my recommendation).
Note to all: those TA tripleizers won't work as-is on a Gran Sport 144 arm - the spider arms are too thick (radially) where the tripleizer needs to clear them, fwiw.