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Pre-Indexed Derailers(5 posts)

Pre-Indexed Derailerslaffeaux
Mar 20, 2003 8:32 PM
Lots of questions these days. Here's an easy one.

I've always heard that you can't use a non-indexed derailer with indexed shifters. Why is that exactly? Do they pull different amounts of cable? Seems to me that if they pulled the same amount of cable, what do the shifters care?
re: Pre-Indexed DerailersDave Hickey
Mar 21, 2003 4:54 AM
It all depends on how much pull per click. If the derailleur moves the same amount per cable pull, index shifters will work.
There may have been a pulley issue, toocory
Mar 21, 2003 9:15 AM
I don't remember the details of this, but seems to me that at least the early indexing ders had "floating" top pulleys, with a little play built in to allow for imprecision in cable movement. Could be wrong, though--it just popped into my head when I read the question.
There was a pulley issue, tooM_Currie
Mar 23, 2003 4:17 PM
Certainly in the case of Suntour derailleurs, the top pulley of an indexed one floats, and the Suntour sealed bearing pulleys (which don't float) were packaged with an explicit warning that they were not for indexed shifting.
makes sense. thanks for the info. (nm)laffeaux
Mar 23, 2003 11:31 PM