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Part Identification Challenge
I brought my new bike in for it's maintenance and when taking it out of the trunk, I noticed this piece. It could be nothing important, but maybe someone more familiar with bikes and bike parts could help. Any advice would help.

It's about a half in. wide and 1/3" tall, glossy black.

The 2nd picture has small teeth on the inside.

I have a Trek Fuel EX 5.
Kind of reminds me of a skewer end?? Or
Good maintenance to your Bike, can make it like the wheels are, true and smooth!

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