You guys are pickin' on me...

Going back to my 1st comments:

"Yes maybe???"

"Trial and error. Depends on the amount of side to side float on the upper derailleur pulley."

Pulley float is what makes indexing easy. It allows the chain to self center on the sprocket. I have several bikes with indexing RDs and friction levers. They shift almost as well as indexing levers because there is little or no trimming involved after each shift.

Campy "Dopler" retrofriction levers shifting a Campy Mirage 9 speed index RD. Shifts smooth as silk:




"Also the type of 7 speed cassette or freewheel. Scroll down to sprocket widths..."

7 speed sprocket spacing varied... YMMV "Yes maybe???"


I can't find any pictures of my Shimano 7 on 6 setups but here's a nice shot of Seven of Nine:




I've been a long time Retrogrouch. Didn't get my 1st cassette hub until 10 year ago. I had some NOS sets of Shimano Deore XT MTB hubs with a 6 speed freehub. I assembled my own 7 speed cassette to fit the freehub using 8 speed spacers and a mix of 6 and 7 speed cogs.



I built a Frankenbike using Suntour 6 speed index levers. At the time I read something Sheldon Brown wrote about Suntour levers working well in this kind of application. They've worked well for the past 10 years!



[MENTION=20650]T-Mar[/MENTION] wrote:

"When SunTour first introduced AccuShift in 1987, the shift lever had two indexed settings. One was for SunTour regular spaced 6 speed freewheels and the other was for Suntour Ultra, 7 speed freewheels."

Interesting, I'll have to check out my levers....

verktyg

Chas.