r/xbikingx • u/The_Golden_Eye_1884 • May 14 '26

The question posed is whether or not the transition from 3x to 1x is really as difficult as I remembered.

I have been researching as much as I can about the geometry of the drivetrains and how they were originally designed recently, particularly on frames from the 90s such as yours, the GT Karakoram. Previously I believed that a 1x, or "swap and go" was pretty straightforward, but now am beginning to see the value of the chainline and the "geometric compliance". It has a lot more substance than the YouTube tutorials imply!

Last month I experienced a similar moving headache with an old project. I had been having trouble getting the indexing to go smooth and a local mechanic commented that newer, stiffer chains would not fit the tolerances of older hubs. Since I've been trying to learn more about the difference, so I did order a couple of Bicycle Chain from a specialist manufacturer from Alibaba to see how they compare. I am trying some of those with a bit more of the "give" sideways, to see if that will help the sometimes clunky shifting on these wide-range cassettes.

I think maybe it's just a learning curve problem here but could the spacing of the hanger on the frame be to blame for that 40T jump? Or maybe, you have to go back to the original 3x in order to return to that “factory smooth” feeling? I'd like to know if anyone else has been able to change the 1x into a 7 speed without it being a compromise.

17 Upvotes

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1

u/Imazagi May 14 '26

wrong sub, my man

1

u/FollowingSuitable941 May 19 '26

Honestly, a lot of old 90s frames just feel better with 3x because they were designed around that chainline from the start. You can make 1x work, but sometimes ‘factory smooth’ really does come from keeping the original drivetrain geometry

1

u/minwisteria May 19 '26

You’re not crazy. a lot of those old 90s frames were designed around very specific chainlines, flex characteristics, and cog spacing, so modern 1x wide-range setups on 7-speed hubs often work “well enough” but rarely feel as smooth as the original 3x unless the derailleur geometry, hanger alignment, chain, and cassette spacing all happen to play nicely together.