Big chain ring tooth damaged after 5000 miles?
05-18-17, 12:39 PM
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Big chain ring tooth damaged after 5000 miles?
One of the teeth in my big chainring is damaged after about 5,000 miles of riding. Is that normal? ring-problem-1.jpg Oh, the second one from the right (relative to the circled one) is damaged as well. This chainring has a short life, right?
05-18-17, 01:15 PM
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Chainrings wear down eventually, some more quickly than others depending on conditions and maintenance. I replace the chainrings on my gravel bike at least once a year, but on my road bike I can't remember the last time I changed them.
If you aren't experiencing any shifting problems it's probably fine.
If you aren't experiencing any shifting problems it's probably fine.
05-18-17, 01:28 PM
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Looks normal.
Chainring teeth aren't identical, some of the teeth are shaped to allow better shifting.
Chainring teeth aren't identical, some of the teeth are shaped to allow better shifting.
05-18-17, 02:11 PM
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When I switch from the small ring to the big, it sometimes wants to move back to the small ring. And when I am on the big ring, I hear this clicking sound and see that the chain is not perfectly seated/aligned with the ring. If the chain ring is ok, could it be the problem with the chain. This is a new chain I just put on 2 days ago.
05-18-17, 03:18 PM
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What is visible in the photo indicates that the bike sees pretty rough service. At least two broken teeth in that photo. Those must have been 5000 hard miles.
Always do the easy and cheap thing first. Maybe just clean, lub and adjust. When was the last time that was done?
Always do the easy and cheap thing first. Maybe just clean, lub and adjust. When was the last time that was done?
05-18-17, 03:20 PM
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If it is obviously damaged, try Dremelling it back into shape. I did this with one that got mashed by a flying rock. If it isn't obviously damaged, and the chain shifts and tracks smoothly (after making the above-recommended adjustments), just ignore it.
If the chain has worn out the chainring, you will never get it to track smoothly.
Try this test:
https://cyclingtips.com/2016/09/how-...-chain-wear-2/
I wear out Ultegra 11-speed rings pretty rapidly.
If the chain has worn out the chainring, you will never get it to track smoothly.
Try this test:
https://cyclingtips.com/2016/09/how-...-chain-wear-2/
I wear out Ultegra 11-speed rings pretty rapidly.
Last edited by Cyclist0108; 05-18-17 at 03:24 PM.
05-18-17, 03:20 PM
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Looks like normal tooth shaping for better shifting to me. The other issue you are having is derailleur /shifter/cable tension related.
05-18-17, 03:30 PM
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Check the "damaged" teeth and see if they are arranged symmetrically around the chain ring and associated with the shift ramps and pins. If so they are truncated to aid in shifting. The wear in the gullets of the teeth is unusual. Do you shift under load a lot?
05-19-17, 01:51 AM
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and it would be a safe bet to say the small ring is worn even worse.
Last edited by maddog34; 05-19-17 at 01:56 AM.
