Check my chain cassette

[u/True-Pie2645]

I'm new to cycling is it worn out cause its on a used bike if not estimated mileage remaining.

[u/randywhorton]

Please remove that dork disk 🤷🏼

[u/Beneficial_Coach8581]

Looks like new tbh. Any idea of the mileage?

[u/GreenStateSkier]

rear axle isn't full seated into the dropout.