This technical telemetry report examines tire production batch 3215, manufactured during the 32th week of 2015 (August). Operating at a calculated age of 11.0 years, the structural integrity and polymer elasticity of this serial series have been evaluated against NHTSA and NASCAR safety benchmarks.
Pit Assessment: Structural rubber life limit exceeded! Hardened rubber compound elevates blowout risk at high speeds.
"At 11.0 years old, batch 3215 (August 2015) exceeds the maximum 6-year safety ceiling recommended by Michelin, Continental, Goodyear, and the U.S. NHTSA. The rubber compound has hardened significantly, elevating blowout risk at high speeds."
Cross-reference batch age with standardized grading for rolling resistance, wet grip index, and pass-by exterior noise.
If inspecting a pre-owned vehicle fitted with DOT 3215 tires, note that you are looking at rubber manufactured 11.0 years ago. Because the rubber compound has hardened, request a tire replacement credit or discount from the seller.
Found DOT 3215 on your emergency spare? Unused rubber still oxidizes due to ambient temperature swings and ozone in the trunk. Treat this spare strictly as a temporary emergency limping wheel under 45 mph.