When to Replace Tires?
So… How to we know when to replace tires? Good question! Since 1968, the government has mandated that tires should be replaced when the original tread has worn to a depth of 2/32-inch.
The good news is that you don’t need expensive equipment to measure this! simply push a penny into the tread. If Lincoln’s head is not covered by the tread (as the picture illustrates), go get yourself some new online tires, as the tire is illegal and dangerous.
Remember that 2/32-inch tread depth is just the legal requirement. Obviously the more tread the better, as the Tire Rack experiments have shown. This is especially the case when driving in rain or snow.