Should I be riding on these???

If they get below the wear strips, you shouldn't be driving on them. If you've got no tread at all....then you're well below the wear strips.

Reasons they could be bald in the front and not the back? Maybe you like to smoke your tires frequently......? Cornering will wear your tires a little bit more, too, as will a poor alignment. That's one reason you rotate the tires every so often, to get more even wear throughout.

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