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  1. #1
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    Converting Surly OD crank to Single?

    Anyone have tips on converting a Surly OD crank to single?

    It looks like I could replace the outer 94mm ring with another 5-bolt 94mm ring. Not sure how the crank bolt lengths world work out. This would put the single ring in "outer" position, ok for singlespeed use but not optimal for a 1x10 setup.

    Otherwise I have to spend $65 just for a "spider" adapter to extend 58mm BCD to 94 if I want to run the ring in the "middle" position (basically replacing the shipping granny-ring). Is there a better way? Putting it middle also leaves the outer ring mounts sort of dangling awkwardly.

  2. #2
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    I put a surly 30 tooth ring on the outer position. bolts are fine- theres only one ring there anyway. works perfect on my moonlander with 1x10. been using it since mid last summer, and have been getting better chain life then with my previous crank set up

  3. #3
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    Quote Originally Posted by bjfalken View Post
    I put a surly 30 tooth ring on the outer position. bolts are fine- theres only one ring there anyway. works perfect on my moonlander with 1x10. been using it since mid last summer, and have been getting better chain life then with my previous crank set up
    Thanks, the 30t Surly is exactly what I was looking at. This is for a 170mm bike, so unless I found a different solution likely I would use the single ring for SS, and if throwing gears on go back to 2x10.

  4. #4
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    Where do you find a 30 OD ring. I thought 33 was the smallest avail. Thanks

  5. #5
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    Quote Originally Posted by rjedoaks View Post
    Where do you find a 30 OD ring. I thought 33 was the smallest avail. Thanks
    I used a regular 30t Surly steel 94mm 5-bolt ring from Universal Cycles. It is not designed for the OD specifically. It is purely for single ring applications with thick non-beveled teeth and is not designed to shift. Working fine for SS. I can't imagine the angled chain lines of 1x10 with that square tooth profile though…

  6. #6
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    I gotcha, forgot you were running single. The stainless rings are thick while the OD rings are really thin, although they have ramps and pins.
    I'm wondering how they hold up?

  7. #7
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    If the inner position would be better for chainline when running 1x10, you'll want a 58 BCD chainring with 30 teeth. To my knowledge no-one readily makes them. I don't trust the Surly spider: it's too light and the radial legs are prone to failure when transmitting torque. (Same reason why radial spoked front wheels are OK with rim brakes, but not with drum/disc brakes.)

    I had these babies custom made for my Moonlander and Mr. Whirly cranks. 33 teeth with 104 mm 4-bolt and 110 mm 5-bolt holes for attaching a secondary chainring (dinglespeed) or bash guard to the side:



    Here's the chainstay clearance. Plenty enough:


  8. #8
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    front ring

    Hi Bjfalken,

    What front ring did you run on your 1x10 Moonlander? I'd like to make my Pugsly Ops into 1x10 with the Surly OD Cranks

    Thanks
    Ben

    Quote Originally Posted by bjfalken View Post
    I put a surly 30 tooth ring on the outer position. bolts are fine- theres only one ring there anyway. works perfect on my moonlander with 1x10. been using it since mid last summer, and have been getting better chain life then with my previous crank set up

  9. #9
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    Converting Surly OD crank to Single?

    Recently been pondering the same thing. I ended up going for a Middleburn 28T 58-BCD chainring (closest to 30T I could find), but the longer-term plan is to keep fingers crossed and hope that Wolf Tooth make it to market with a 30T narrow-wide ring in 58 BCD; looks like there's a fairly good chance of this - 30T 58 BCD chainring? (see post 10).

  10. #10
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    It would be great to have some spiderless narrow-wide rings made for these OD cranks. Or a replacement spider that can run some mainstream rings.

    Is the OD's spider interface unique?

  11. #11
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    The spider interface is just a 5-bolt 58 BCD attachment. Mr. Whirly spiders are available in 3 common bolt circle diameters (94mm, 104mm, & 110mm), so you can use it with regular chainrings.

    The problem remains that it's not a part I'd trust in high torque applications, unless they redesign the spider.

    Keep sending feedback to fatbike-friendly chainring manufacturers that you want "middle-size" (30-34t) chainrings with a 58 mm BCD. If Wolftooth and the others never hear from you, they can't find this niche.

  12. #12
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    Anyone know if the Wolftooth 94 BCD narrow wide crank is available yet?

  13. #13
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    Quote Originally Posted by GnarBrahWyo View Post
    Anyone know if the Wolftooth 94 BCD narrow wide crank is available yet?
    I haven't seen it yet. I'm waiting for it as well.
    I like turtles

  14. #14
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    For what it's worth, the 30 stainless surly ring works great long term 1x9. Never dropped the chain and it still looks new after a few years. amazing.

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    Converting Surly OD crank to Single?

    Quote Originally Posted by Bearbait View Post
    For what it's worth, the 30 stainless surly ring works great long term 1x9. Never dropped the chain and it still looks new after a few years. amazing.
    Can you post a pic?


    Sent from my iPad using Tapatalk

  16. #16
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    Quote Originally Posted by NYrr496 View Post
    I haven't seen it yet. I'm waiting for it as well.


    Mine is shipped.

  17. #17
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    Quote Originally Posted by bikedrd View Post
    Mine is shipped.
    As is mine. Yay!
    I like turtles

  18. #18
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    I am holding out for the 28t.

  19. #19
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    Well I see on the Surly website that they have a 28T 58bcd Narrow Wide ring. Will it work with our OD cranks. I also see a Surly stainless steel 28T ring. Can 8 use that along with my 36T outer ring till I can get a Raceface Turbine Cinch crankset. The problem I'm having is when I'm up on the 36T ring and I'm hitting roots my chain comes off and falls down to the 22 ring. I am riding down in Florida and I'm not using the 22t ring unless I know I'm coming into a ruff place then I'll down shift. I have a 9hr race coming up and having a 26 tooth I can just leave it there and remove the f/shifter and derailleur.

  20. #20
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    The Surly 28 tooth isn't available til later in the year. Wolftooth's 30 tooth is available now. Do you have a cluth type derailleur on your bike?
    I like turtles

  21. #21
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    I am holding out for the 28t since my Moonlander is my designated snow bike. I plan on installing a Radr cage from OneUp to shorten the cage up. Granny will only be a smidge taller than the stock 2x.

  22. #22
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    Vuelta makes a 30t ring 94 BCD for $18 and works with a ten speed chain. Running one on mine and it is great.

  23. #23
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    Quote Originally Posted by NYrr496 View Post
    The Surly 28 tooth isn't available til later in the year. Wolftooth's 30 tooth is available now. Do you have a cluth type derailleur on your bike?

    Yes I do have the clutch derailleur. I ordered a Wolftooth yesterday 30t narrow wide ring. I had even shortened my chain as much as I could. I have a 2014 Mukluk 2.

  24. #24
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    Quote Originally Posted by idinomac View Post
    Yes I do have the clutch derailleur. I ordered a Wolftooth yesterday 30t narrow wide ring. I had even shortened my chain as much as I could. I have a 2014 Mukluk 2.
    I like turtles

  25. #25
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    I've been having hell with my Pugsley since I put on the Surly OD. It came with the Hussefelt crank before the OD came out. Pugsley worked great with the Hussefelt crank and aftermarket 24/34 rings, but when in the inner ring it was dangerously close to the tires and chain stay. Then I put on an OD. The stock 22/26 OD I couldn't ever get shifting well enough, and I thought 22/36 is just too wide of a jump for riding both summer and winter in Colorado. All my other mountain bikes are 1x10 with a 42t OneUp. I tried going 1x10 with the 42t OneUp and a Vuelta 30t chain ring and the chain line is so bad it won't shift. The chainline looks like a Z. I also tried the Stainless Surly ring but with the ten speed chain and the horrible chain line it wouldn't even allow the chain to make a rotation around it. I hope that a 28t that goes on the inner portion of the OD fixes all my problems. I'm about ready to part the bike out.

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