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@jersey
didn't read the thread, so may be missing somethign, but if you squeeze a 135 into a 120 you're going to have to adjust your current chainline by a whopping 7.5mm, likely, unless there's some way to adjust the placement of the cog in back... not sure. at the worst it'll be impossible. at the best it'll be adjustable at the back. Most likely you'll just have to deal with it up front and thats going to be a pain in the ass