Replace radial tires when tread depth reaches 2/32 inch (1.6 mm), the legal minimum in most places, including India, or sooner at 4/32 inch for safety in wet conditions. Age matters too—most experts advise replacement after 6 years from manufacture, or 10 years maximum, due to rubber degradation.
Tread Depth Check :
Use the penny test: Insert a penny into the tread with Lincoln's head down; if you see the top of his head, replace the tire. Built-in tread wear indicators (raised bars in grooves) also signal replacement when level with the tread surface.
Age Inspection:
Locate the DOT code on the sidewall—the last four digits show the manufacture week/year (e.g., "1223" means 12th week of 2023). Tires over 5-6 years need annual pro checks, even with good tread.
Other Signs:
Sidewall cracks, bulges, or dry rot from UV/heat exposure.
Vibrations, poor handling, or uneven wear from misalignment/underinflation.
Damage like cuts/punctures beyond repair limits.
Regular rotations every 5,000-8,000 miles and proper inflation extend life. For your location in Tamil Nadu, hot roads accelerate aging, so inspect twice yearly.
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