Doctor, Are My Teefus Alright?
03-31-14, 12:24 PM
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Doctor, Are My Teefus Alright?
Hello,
A bud of mine wants to sell me a crank set he's taken off one of his bikes. He's replaced it with a power meter-compatible one. It has only a few dozen miles on it. Most importantly, the price is right for the build I'm embarking on which I must keep under a very specific budget.
There's just the matter of a slightly worn toof as seen in the following shot:
Is such neglible wear likely to be a problem? I mean if that's the only toof that's slightly worn like that, should I expect it to affect shifting in any negative way?
Thanks in advance for whatever thoughts you'd like to share.
A bud of mine wants to sell me a crank set he's taken off one of his bikes. He's replaced it with a power meter-compatible one. It has only a few dozen miles on it. Most importantly, the price is right for the build I'm embarking on which I must keep under a very specific budget.
There's just the matter of a slightly worn toof as seen in the following shot:
Is such neglible wear likely to be a problem? I mean if that's the only toof that's slightly worn like that, should I expect it to affect shifting in any negative way?
Thanks in advance for whatever thoughts you'd like to share.
03-31-14, 12:35 PM
#2
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Does that "pattern" occur every Nth tooth?
Most rings have regularly spaced teeth with a different profile to assist shifting.
Most rings have regularly spaced teeth with a different profile to assist shifting.
03-31-14, 12:53 PM
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Take a good look. Does it really look like wear? Or is it nicely formed like it was machined there intentionally?
It's a shift gate, put there to allow the chain to move over more as part of the shift process. Looking at the photo, that chainring is in excellent shape, ride it in good health.
If your friend gave you a good deal, he's a good guy and deserves a beer.
It's a shift gate, put there to allow the chain to move over more as part of the shift process. Looking at the photo, that chainring is in excellent shape, ride it in good health.
If your friend gave you a good deal, he's a good guy and deserves a beer.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
03-31-14, 01:14 PM
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Thanks Bill Kapaun,
Looking closer at the big chain ring, I myself can't discern any "pattern".
Splendid! Thanks FBinNY. I wasn't sure what exactly I was seeing. That's why I solicited second (and third) opinions. 
That's what I was hoping to hear. I'm gonna go ahead and take him up on his offer - and buy him that beer
Many thanks,
nirVELOvana
Looking closer at the big chain ring, I myself can't discern any "pattern".
Take a good look. Does it really look like wear? Or is it nicely formed like it was machined there intentionally?
It's a shift gate, put there to allow the chain to move over more as part of the shift process. Looking at the photo, that chainring is in excellent shape, ride it in good health...
It's a shift gate, put there to allow the chain to move over more as part of the shift process. Looking at the photo, that chainring is in excellent shape, ride it in good health...
That's what I was hoping to hear. I'm gonna go ahead and take him up on his offer - and buy him that beer
Many thanks,
nirVELOvana
03-31-14, 01:34 PM
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i can't think, although i haven't tried very hard, of a reason why a chainring would wear like that, all teeth, IME, wear evenly and, i believe, chainrings have had multi-profiled teeth now for about a decade or so.
so i'd say it's not long in the toof.
so i'd say it's not long in the toof.
