The depth that a tire’s tread starts out varies depending on the type and brand of tire, but all tires needs to be replaced when they get to 2/32nds of an inch. You should probably start planning for new tires when your tread is down to 4/32nds of an inch.
Find New Tires, Wheels, Hubcaps, Rims, and more. This site displays a high quality catalog of listings in stock and ready for shipping on the the internet. ... Professional Dial Type Tire Tread Depth Gauge For Cars, Motorcycle, Truck - Tg32. 4 New - $23,928.96.