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Worn chainrings

Old 05-15-19, 09:22 PM
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CycleryNorth81
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Worn chainrings

How do you tell if a chainring is worn out visually? Can you tell from a picture on ebay if a chainring is worth purchasing? Please provide pictures of good and worn out chainrings if you have them.

Last edited by CycleryNorth81; 05-15-19 at 09:41 PM. Reason: request for pictures
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Old 05-15-19, 10:17 PM
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Originally Posted by CycleryNorth81 View Post
How do you tell if a chainring is worn out visually? Can you tell from a picture on ebay if a chainring is worth purchasing? Please provide pictures of good and worn out chainrings if you have them.
Perhaps you can provide link to ebay auction and members can give their opinion.
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Old 05-15-19, 10:49 PM
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Originally Posted by tarsi View Post
Perhaps you can provide link to ebay auction and members can give their opinion.
I was just wondering in general how to tell a worn chainring from a chainring that still has "life" in it. I ask because it seems harder and harder to get 144 bcd rings that are not for fix bikes.
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Old 05-16-19, 12:25 AM
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Essentially the teeth sharpen over time. A new chainring will have blunt teeth, a worn chainring will have sharp teeth.

A worn chainring can reduce chain life and will probably shift poorly. In extreme cases it can skip, chain can fall off and teeth can break off.



A chain and chainring can wear out together quite happily, but try to put a new chain on a worn chainring and you'll most likely get problems. Although in my experience chainrings are less fussy than sprockets.
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Old 05-16-19, 01:11 AM
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Originally Posted by P!N20 View Post
Essentially the teeth sharpen over time. A new chainring will have blunt teeth, a worn chainring will have sharp teeth.

A worn chainring can reduce chain life and will probably shift poorly. In extreme cases it can skip, chain can fall off and teeth can break off.



A chain and chainring can wear out together quite happily, but try to put a new chain on a worn chainring and you'll most likely get problems. Although in my experience chainrings are less fussy than sprockets.
Thanks for the info. and pictures.
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Old 05-16-19, 06:10 AM
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That pics demonstrates why worn rings are usually referred to as having “shark teeth.”
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Old 05-16-19, 06:21 AM
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It's worth noting that most of the time you can't tell a worn out chainring that's no good with a new chain from a chainring in good condition. You can only spot chainrings in really bad condition from pictures, and if the chainring is visibly worn, the chain and cogs are probably similarly done for.
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Old 05-16-19, 08:42 AM
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One of the main causes of chainring wear is chain elongation, so be sure to replace any chain that measures more than 12 1/16" per 24 half-links, a 1/2-percent elongation.
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Old 05-16-19, 12:31 PM
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Does anybody know of any place where NEW 144bcd rings are available for road bikes? All the new 144bcd rings I see are for track bikes. I believe the track rings are thicker than the road rings.
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Old 05-16-19, 12:40 PM
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T.A. Specialties makes them, although they are pricey. If you find 3/32 instead of the common track 1/8 you might be able to get away with it.
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Old 05-16-19, 07:53 PM
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Originally Posted by CycleryNorth81 View Post
Does anybody know of any place where NEW 144bcd rings are available for road bikes? All the new 144bcd rings I see are for track bikes. I believe the track rings are thicker than the road rings.
https://www.sjscycles.co.uk/144-bcd-5-arm/?geoc=US
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Old 05-16-19, 08:09 PM
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Great thread for us newbies,thanks.
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Old 05-16-19, 08:21 PM
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CycleryNorth81
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Thanks for the link.
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Old 05-16-19, 09:01 PM
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Originally Posted by CycleryNorth81 View Post
I was just wondering in general how to tell a worn chainring from a chainring that still has "life" in it. I ask because it seems harder and harder to get 144 bcd rings that are not for fix bikes.
Chainrings with 144 BCD and 3/32" width chain should work OK with derailleur chain. The shifting might not be as good as the latest-and-greatest pinned-and-ramped rings, but it will probably work.

Here's a photo of one of my well-worn chainrings next to its replacement:

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