When do you know it's time to replace?

Ok... since my front tires are not going to "wear evenly"... when will I know it's time to replace them?

Thanks!!!

Just inspect them occasionally by turning the wheel all the way to one side and when the inside tread(wears quicker) hits the wear indicators... it's time.

hlweyl said:

Just inspect them occasionally by turning the wheel all the way to one side and when the inside tread(wears quicker) hits the wear indicators... it's time.

Click to expand...

The wear indicators are horizontal bars molded into the tire tread every 6-10 inches along the tread. When the tire wears down to 2/32" tread depth, when you want to replace them, those wear indicator bars become flat across the tread.

Another way of telling is the penny test, described here.