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Tire Tracker
REGUL
SPORT CHALLENGER
Size
Temperature Rating
Traction Rating
Treadwear Rating
All 13"
C
B
A
C
B
A
AA
440
0
900
All OTHERS
C
B
A
C
B
A
AA
480
0
900
Sources: NHTSA Uniform Tire Quality Grading Standards, TireReview.com