tiresizeinches.com

Same 17 in wheel · side by side

255/75R17 vs 285/70R17

First size

mm, 115–395
% of width
inches

Second size

mm, 115–395
% of width
inches

Comparing 255/75R17 · 285/70R17. Change any field and both follow.

Difference in overall diameter

+2.03%

285/70R17 is 0.65 in taller than 255/75R17 (+2.03%) and 1.18 in wider; at an indicated 60 mph you are doing 61.2 mph.

255/75R17 and 285/70R17 laid over each other at one scale, with the gap enlargedTwo circles drawn at one scale and sharing a center: the solid ring is 255/75R17 at 32.06 in overall, the dashed ring is 285/70R17 at 32.71 in. A detail view beside them shows the same two edges enlarged, with the gap between them dimensioned at 0.65 in.0.65 inDETAIL — ENLARGED255/75R17 · 32.06 in285/70R17 · 32.71 in
Both overall diameters at one scale, sharing a center. The detail beside them enlarges the one place they differ, and its dimension is the difference the table below states.

The difference, one row at a time

255/75R17 and 285/70R17, one measurement per row; the difference is 285/70R17 minus 255/75R17
Measure­ment 255/75R17 285/70R17 Differ­ence
Overall diameter32.06 in32.71 in+0.65 in · +2.03%
Section width10.04 in11.22 in+1.18 in
Sidewall height7.53 in7.85 in+0.32 in
Circumference100.72 in102.76 in+2.04 in
Revolutions per mile629.1616.6−12.5

Other pairs with one of these two in them

Each size on its own