Chainline question about 1x conversion
08-10-20, 05:09 PM
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Chainline question about 1x conversion
I have a 3x8 that I'd like to change to a 1x. I'm comfortable with just the middle (32t) chainring and the current 8 speed, 11-34t cassette. I don't use the large or small front chainrings at all, though I could see myself wanting some easier gears once I start riding steeper and more technical uphills. I was thinking I'd start the conversion by removing the front chainrings, derailleur, and shifter, and getting a 1x chainring with 32t. Later I can upgrade to a 10 speed cassette in the back if I actually start feeling like I need it.
The current drivetrain on the bike is set up to be a 3x. Thus, the chainline should be centered through the middle cog. If I swap the 3x for a 1x chainring, won't the chainline be off-center? Is this a problem? Do I need to get a 1x specific spider? Also, do I really need a narrow-wide or drop stop 1x chainring or will any old chainring work fine?
For reference, I have a hardtail, my local trails are really chunky/rocky, and I ride beginner to intermediate trails with the bike, though I may want to try harder stuff in the future.
The current drivetrain on the bike is set up to be a 3x. Thus, the chainline should be centered through the middle cog. If I swap the 3x for a 1x chainring, won't the chainline be off-center? Is this a problem? Do I need to get a 1x specific spider? Also, do I really need a narrow-wide or drop stop 1x chainring or will any old chainring work fine?
For reference, I have a hardtail, my local trails are really chunky/rocky, and I ride beginner to intermediate trails with the bike, though I may want to try harder stuff in the future.
08-10-20, 06:06 PM
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Why would the chainline change if you put a new ring in the exact same place? Does it currently work? If so, you're probably fine since you never shift the front anyway.
I like narrow wide but I'm sure it will work without except on really bumpy stuff
I like narrow wide but I'm sure it will work without except on really bumpy stuff
08-17-20, 02:13 PM
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You don't have to do anything but remove the big and little chainrings, front derailer and shorten your chain. If you have issues with losing the chain in the lowest or highest gears, the look into a narrow wide chainring. Or you can install the old front derailer with the endpoints locked in the center as a chainguide.
08-18-20, 09:33 PM
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You are re-using the same cranks, right?
Last edited by Kapusta; 08-19-20 at 05:10 AM.
08-23-20, 05:28 PM
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Did the same thing but went to 1x10. Also used a new ss crank. Chainline is fine. If reusing original cranks, just put it in the middle ring position. You don't need narrow wide but it helps avoid drops.
