31/10.5R15 Tires

The size 31x10.5R15 gives three measurements: tread width 31 mm, sidewall height 3.3 mm (10.5% of the width), and rim size 15 in. Overall diameter is 388 mm (about 15.3 in). One full turn covers 1.22 m, or 821 turns per km.

To learn what each number means, read How to read a tire size