Senior Member
Join Date: Jun 2008
Location: Antelope Valley, SoCal
Posts: 473
Bikes: 1975 Eisentraut Ltd, 1995 Trek 7000 MTB, 2007 Masi Vincere, 1974 Masi GC, 1981 Specialized Allez, 1984 Specialized Sequoia
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Yeah, I don't think New Winner ultra-6 (for example) are evenly spaced, but can be used under the Accushift indexing. All others are "try and see" experimentation - it may work great! The one other "gotcha" using 6-speed clusters on 120 OLN frames can be very tight clearance between the chain stay and the smallest cog when getting the wheel in-and-out of the horizontal dropout. Sometimes the stack and spacing can be right on the axle but the cog hits the chainstay before the axle can dis-engage the dropout slot. I have this problem on one of my bikes that is 120 spaced and just barely budges out to 122.
Good luck! - Jim