This is the archive page for etyres’ NHTSA Tyre Ratings. These NHTSA pages contain historical data which may no longer be accurate.
NHTSA Tyre Ratings – Explanation of Temperature Ratings
Temperature grades are an indication of a tyre’s resistance to heat. Sustained high temperature (for example, driving long distances in hot weather), can cause a tyre to deteriorate, leading to blowouts and tread separation.
From highest to lowest, a tyre’s resistance to heat is graded as “A”, “B”, or “C”.
Of current tyres:
27% are rated “A”
59% are rated “B”
11% are rated “C”