Bump on my rim

[awitt]

[ATTACH=CONFIG]19023[/ATTACH]
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.

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[awitt]

It’s 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.

[Harry Meatmotor]

@awitt 186120 wrote:

[ATTACH=CONFIG]19023[/ATTACH]
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.

[awitt]

Thanks harry meatmotor!

[Author]

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