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  1. #1
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    Chainring wear'n'tear. How much is too much?

    My bike is a Cannondale Caad 10 105 2013 model. Yesterday I noticed a more present than usual 'clicking' noise coming from my rearcogs. After posting here later in the afternoon I learned this was due to cross chaining. Today I took my bike out again and noticed the cross chaining noise even more than usual, possibly just because I was paying more attention. I started to practice changing the gears up and substituting higher gears on the smaller chainring with mid range gears on the larger chanring. I will be taking the bike tomorrow to get looked at and see if the amount of cross chaining occurring is normal or if it needs to be adjusted. Remember back to the cross chaining article I read, this process can put some wear'n'tear on the chainrings affected. I have attached some pictures of the larger and smaller chainrings of my 2 chainring set. As you can see in the larger chainring there is in fact a decent amount of variation between the shapes and sizes of each tooth. In the smaller chainring each tooth is almost exactly the same. I've only taked the bike out about ten times since I bought it, and have less than 100 miles logged into it. Its true the first 8 rides I was not paying much attention to the cross chaining noise, but each ride was less than 10 miles, and the noise didn't happen too often. Is it really possible that cross chaining can cause this much damage to my larger chainring this quickly, or is the variation in size among the teeth normal?

    IMG_0709.jpgIMG_0710.jpgIMG_0708.jpg

  2. #2
    don't misunderestimate me BoSoxYacht's Avatar
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    Quote Originally Posted by dyllandry View Post
    My bike is a Cannondale Caad 10 105 2013 model. Yesterday I noticed a more present than usual 'clicking' noise coming from my rearcogs. After posting here later in the afternoon I learned this was due to cross chaining. Today I took my bike out again and noticed the cross chaining noise even more than usual, possibly just because I was paying more attention. I started to practice changing the gears up and substituting higher gears on the smaller chainring with mid range gears on the larger chanring. I will be taking the bike tomorrow to get looked at and see if the amount of cross chaining occurring is normal or if it needs to be adjusted. Remember back to the cross chaining article I read, this process can put some wear'n'tear on the chainrings affected. I have attached some pictures of the larger and smaller chainrings of my 2 chainring set. As you can see in the larger chainring there is in fact a decent amount of variation between the shapes and sizes of each tooth. In the smaller chainring each tooth is almost exactly the same. I've only taked the bike out about ten times since I bought it, and have less than 100 miles logged into it. Its true the first 8 rides I was not paying much attention to the cross chaining noise, but each ride was less than 10 miles, and the noise didn't happen too often. Is it really possible that cross chaining can cause this much damage to my larger chainring this quickly, or is the variation in size among the teeth normal?

    IMG_0709.jpgIMG_0710.jpgIMG_0708.jpg
    Those chainrings are fine. The size variance is to help when shifting from the little ring to the big ring.

    Crosschaining will cause things to wear more quickly, and can cause noise, but it's really not the big deal that some people think it is.
    Last edited by BoSoxYacht; 08-27-14 at 05:26 PM.

  3. #3
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    Those are new ring. Wear doesn't make teeth shorter because the tips slip into the chain and that's not where wear happens. It's the pulling sides of the teeth that wear, and worn teeth are thinner, not shorter. Because the wear is only on one side of the teeth, they develop an asymmetrical "SHARK FIN" profile.

    You'll begin to see this in 20,000 miles or so.
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  4. #4
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    The end of your post made me chuckle. Thank you for the image and description, I'll know what to look for now.

  5. #5
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    Okay, that makes me a bit more comfortable about the crosschaining. I won't panic each time it happens. Good to know the chainrings are fine, they're brand new still. Thank you!

  6. #6
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    Your derailleurs should be able to be adjusted so that all combinations except the large ring/large cog and small ring/small cog work without significant noise. Yes as you get close to these extremes some added noise may appear, but even on the next cog to the ends, it should be very minor.
    Robert

    "Wish I didn't know now what I didn't know then." (Bob Seger, "Against the Wind")

  7. #7
    Senior Member gc3's Avatar
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    Try keeping your drivetrain clean and lubed. All things being equal, I like the sound that doesn't make....
    "I tried being reasonable, I didn‘t like it."

    "I understand. I just don't care"

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