2x to 1x
12-05-22, 11:05 AM
#1
Newbie
Thread Starter
Join Date: Jun 2022
Location: Pacific Northwest
Posts: 4
Bikes: Road, Cx, gravel.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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. I’m wondering if anyone can tell me if I can use the stock crank with a single or will there be chain line problems?
12-05-22, 11:43 AM
#2
Habitual User
Join Date: Jan 2020
Location: Altadena, CA
Posts: 7,966
Bikes: 2023 Niner RLT 9 RDO, 2018 Trek Procaliber 9.9 RSL, 2018 Storck Fascenario.3 Platinum, 2003 Time VX Special Pro, 2001 Colnago VIP, 1999 Trek 9900 singlespeed, 1977 Nishiki ONP
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 4933 Post(s)
Liked 8,074 Times
in
3,816 Posts
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.
__________________
"Swedish fish. They're protein shaped." - livedarklions
"Swedish fish. They're protein shaped." - livedarklions
12-05-22, 12:09 PM
#3
Newbie
Thread Starter
Join Date: Jun 2022
Location: Pacific Northwest
Posts: 4
Bikes: Road, Cx, gravel.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
2x to 1x
Looks like wolf tooth only sells 107 bcd for sram. I use 110 asym.
12-05-22, 12:18 PM
#4
Habitual User
Join Date: Jan 2020
Location: Altadena, CA
Posts: 7,966
Bikes: 2023 Niner RLT 9 RDO, 2018 Trek Procaliber 9.9 RSL, 2018 Storck Fascenario.3 Platinum, 2003 Time VX Special Pro, 2001 Colnago VIP, 1999 Trek 9900 singlespeed, 1977 Nishiki ONP
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 4933 Post(s)
Liked 8,074 Times
in
3,816 Posts
Like this?... https://www.wolftoothcomponents.com/...inring-bcd_110
__________________
"Swedish fish. They're protein shaped." - livedarklions
"Swedish fish. They're protein shaped." - livedarklions
12-05-22, 02:16 PM
#5
Senior Member
Join Date: Mar 2006
Location: Chicago, IL, USA
Posts: 2,873
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1455 Post(s)
Liked 1,477 Times
in
867 Posts
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.
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.
12-06-22, 04:12 PM
#6
Newbie
Thread Starter
Join Date: Jun 2022
Location: Pacific Northwest
Posts: 4
Bikes: Road, Cx, gravel.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Yes the rival 1 long will work. I think I read somewhere that the chainring should line up as close to middle of cassette?
12-07-22, 11:08 AM
#7
Senior Member
Join Date: Mar 2006
Location: Chicago, IL, USA
Posts: 2,873
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1455 Post(s)
Liked 1,477 Times
in
867 Posts
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
