From: KvnMuadib(AT)aol.com
"can anyone on the list tell me if there is a difference in the long and short cage versions of the late 70,s as far as the chain length that is required? i have a suntour cyclone short cage der. for a 5 spd freewheel fairly lge 1st gear ..... <snip> anyways i guess my question is if i replaced it with the long cage model would i have to modify or get a longer chain? ...<snip>.... kevin ruberg howell nj USA"
yes, there is a difference. yes, the long cage version, ie.e GT model, does require a longer chain. Depending on chainstay length, chainring size, etc., the length will vary. However, I'd bet on needing 114 to 116 links.
good luck,
Steve Kurt
Peoria, IL
also USA