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2x to 1x

Old 12-05-22, 11:05 AM
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Hygearz
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2x to 1x

I have a surly midnight special w/ rival 2x that I want to convert to 1x. Already have an e thirteen 9-46 cassette, rival1 derailleur and new wheels with xdr driver. Iím wondering if anyone can tell me if I can use the stock crank with a single or will there be chain line problems?
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Old 12-05-22, 11:43 AM
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You should be able to use the stock crank. I would suggest using a chainring designed for 1x (Wolf Tooth "Drop -Stop", is one example), and you will probably need shorter chainring bolts. Be aware that you might be limited on chainring size if using the inner chainring position due to the shape of the chainstay.
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Old 12-05-22, 12:09 PM
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2x to 1x

Looks like wolf tooth only sells 107 bcd for sram. I use 110 asym.
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Old 12-05-22, 12:18 PM
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Originally Posted by Hygearz View Post
Looks like wolf tooth only sells 107 bcd for sram. I use 110 asym.
Like this?... https://www.wolftoothcomponents.com/...inring-bcd_110
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Old 12-05-22, 02:16 PM
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You can get different chainring bolts with spacers/shims to adjust the chainline if you're finding that it's off. May not need them.

Also, are you sure that your Rival 1x RD can handle a 9-46? SRAM lists 10-42 max for the mechanical Rival 1x long cage.
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Old 12-06-22, 04:12 PM
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Yes the rival 1 long will work. I think I read somewhere that the chainring should line up as close to middle of cassette?
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Old 12-07-22, 11:08 AM
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Originally Posted by Hygearz View Post
Yes the rival 1 long will work. I think I read somewhere that the chainring should line up as close to middle of cassette?
There are specs out there that tell you exactly what the chainline should be in terms of millimeters for your bike, but assuming your current 2x setup is stock (and works fine in all gears), you can get an idea by measuring the offset of your two rings, and set your 1x halfway between them. The only potential complication here is if you're changing the rear chainline with a different type of hub/cassette.

Usually it's roughly centered on the cassette, but this can vary. The big concern is the ring being too far inboard and hitting the frame or limiting tire clearance. If it's too far outboard, you'll get a lot of noise, shifting issues, dropped chains and binding/grinding when in the largest cogs. When I converted my old CX bike from 2x to 1x I recall different rings and bolts that could alter the spacing one way or another. I just eyeballed mine, and it shifts through the entire cassette fine and I haven't experienced any issues, but the angle is pretty extreme when in the lowest gear so I'm sure it's not ideal.

Here's a Park Tools article/video that gives a pretty good overview: Chainline Concepts | Park Tool
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