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Old 04-25-14, 10:17 AM   #1
TheOutdoorsman
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Chainring rubs frame

I have a 2013 Motobecane Uno single speed bike. It came with stock FSA 38T and I went to a Sugino 48T and it just barley rubs the frame. This is with just placing and fitting it on there, nothing tight. My BB is a Sealed Cartridge 113mm.

Hi, I bought a larger chainring for my single-speed bike and now it just rubs the frame. Was wondering what the best course of action would be? Longer BB spindle? Add a spacer? Other? (would this throw the chain out of wack because the back freewheel would still be the same)

Thanks I appreciate your help

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Last edited by TheOutdoorsman; 04-25-14 at 10:48 AM.
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Old 04-25-14, 10:22 AM   #2
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Got a pic?

Tell us more. What bike frame? What size and brand did you previously have, and what size and brand did you switch to?
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Old 04-25-14, 10:24 AM   #3
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I'd add a spacer before swapping out the spindle. a 2mm one shouldn't affect your chainline enough to matter. For an English BB, you can look for BB or freewheel spacers as they're the same ID.
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Old 04-25-14, 10:29 AM   #4
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You have a choice of a longer spindle or a spacer, with the best or possible option depending on the specifics.

If you have a classic cup/spindle BB, you can add a spacer under the right cup, but you'll be limited because the left cup get recessed the same amount and there may not be enough for the lockring. So a longer soindle is the best answer if you need more than 1-2mm max.

OTOH if you have a cartridge BB that doesn't use lockrings, than a spacer behind the right cup is simple and all you need.

Modern external BBs may allow you to solve it by switching spindle spacers from left to right, but you can't just add one.

Lastly, if you have a steel frame, you can extend the chainstay crimp to make more clearance. It's easier than you might imagine, but needs to be done right.
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Old 04-25-14, 10:46 AM   #5
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Hi, thanks for your help so far, I've just added picture above...
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Old 04-25-14, 10:51 AM   #6
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I saw the crimp was just too short for my new chainring, but thought it would weaken the frame to extend it.
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Old 04-25-14, 10:52 AM   #7
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Why don't you go for the simple obvious solution?

Move the chainring to where the chainguard is on the inside position on the crank arm. Then move the chainguard to the outside position. Then use standard double chainring bolts to hold it together and save the spacers for the future.
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Old 04-25-14, 10:56 AM   #8
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Thanks, it worked...I appreciate it, thanks again. Now my chain however, is too small. ANY way to find out new chain length to get? Thanks

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Old 04-25-14, 11:27 AM   #9
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yea +1, Press or Bang in a bit more of a dent there,, and touch up any paint chip..


You could of course use a smaller chainring and then the dent is already there.
Quote:
I have a 2013 Motobecane Uno single speed bike. It came with stock FSA 38T and I went to a Sugino 48T
a 46t?


a smaller cog on the hub too so the gear is the same size about..

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Old 04-25-14, 11:33 AM   #10
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Originally Posted by TheOutdoorsman View Post
Thanks, it worked...I appreciate it, thanks again. Now my chain however, is too small. ANY way to find out new chain length to get? Thanks
Assuming your current chain is the correct length, you need 5 more 1/2-links to cover the additional 10 teeth of your new chainring. Since 1/2-links have to be added two at a time to keep the mating ends correct, you will have to add 4 or 6 depending on how much adjustment you have in your rear wheel position in the dropouts.
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Old 04-25-14, 11:46 AM   #11
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Why don't you go for the simple obvious solution? . . .
Such practical insights are so rare in this forum. (sigh)
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Old 04-25-14, 11:47 AM   #12
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How do you find the master link to be able to add more links on?
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Old 04-25-14, 11:51 AM   #13
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How do you find the master link to be able to add more links on?
Unfortunately, there's not an app for that. You have to actually look at your chain yourself. If you can't find a "master link" then maybe it is not there and the chain will have to be broken.
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Old 04-25-14, 12:34 PM   #14
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...BROKEN ? I thought we were trying to fix the thing.
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