Oxygen molecules penetrate the tire from the inside out. Over time, the rubber hardens (loses "flexibility") due to polymer chain breakage. Dry Rot: You will see small cracks in the sidewall or between the tread blocks. These micro-cracks can lead to sudden tread separation or a blowout at highway speeds.
| Date Code Reading | Action | |-------------------|--------| | Current year minus 0-5 years | Safe to use. Continue routine inspections. | | Current year minus 6-9 years | Replace soon. Monitor closely for cracks or hardness. | | Current year minus 10+ years | Replace immediately. High risk of sudden failure. | nexen date code