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Thread: Bump on my rim

  1. #1
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    Question Bump on my rim - Resolved

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    This bump appeared on the rim of my front wheel today. I started to hear a scraping noise from one part of the rim. It sounded like a rock in the brake pad but it wasnít constant so that couldnít be it. When i got home and wiped off the rims I found the bump shown in the photo. Itís not a scratch or divot, it looks like the end od a tiny rod sticking out of the rim. I tried some fine grain metal sandpaper but it made no difference with light pressure and I donít want to use more force. I know I probably need a new wheel, these are the cheap ones that came on the bike. Iím just wondering what it is. The rims are Mavic Aksium on Mavic hubs. The bike is a cannondale synapses carbon di2 with 105 brakes.
    Last edited by awitt; 01-19-2019 at 01:49 PM.

  2. #2
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    Itís a piece of debris that was ground into the rim and covered with aluminum residue from normal braking action. I have to buff it flat and make sure the brake pads are clean.

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  4. #3
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    Quote Originally Posted by awitt View Post
    Name:  24946A06-0681-4B9E-9DC9-44E5050B594E.jpg
Views: 182
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    This bump appeared on the rim of my front wheel today. I started to hear a scraping noise from one part of the rim. It sounded like a rock in the brake pad but it wasn’t constant so that couldn’t be it. When i got home and wiped off the rims I found the bump shown in the photo. It’s not a scratch or divot, it looks like the end od a tiny rod sticking out of the rim. I tried some fine grain metal sandpaper but it made no difference with light pressure and I don’t want to use more force. I know I probably need a new wheel, these are the cheap ones that came on the bike. I’m just wondering what it is. The rims are Mavic Aksium on Mavic hubs. The bike is a cannondale synapses carbon di2 with 105 brakes.
    A single-sided straight razor blade works really well to slice these little barnacles off of the brake track. Just be careful since you're working so close to the tire sidewall.

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  6. #4
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    Thanks harry meatmotor!

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