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Same 20 in wheel · side by side

275/60R20 vs 305/55R20

First size

mm, 115–395
% of width
inches

Second size

mm, 115–395
% of width
inches

Comparing 275/60R20 · 305/55R20. Change any field and both follow.

Difference in overall diameter

+0.66%

305/55R20 is 0.22 in taller than 275/60R20 (+0.66%) and 1.18 in wider; at an indicated 60 mph you are doing 60.4 mph.

275/60R20 and 305/55R20 laid over each other at one scale, with the gap enlargedTwo circles drawn at one scale and sharing a center: the solid ring is 275/60R20 at 32.99 in overall, the dashed ring is 305/55R20 at 33.21 in. A detail view beside them shows the same two edges enlarged, with the gap between them dimensioned at 0.22 in.0.22 inDETAIL — ENLARGED275/60R20 · 32.99 in305/55R20 · 33.21 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

275/60R20 and 305/55R20, one measurement per row; the difference is 305/55R20 minus 275/60R20
Measure­ment 275/60R20 305/55R20 Differ­ence
Overall diameter32.99 in33.21 in+0.22 in · +0.66%
Section width10.83 in12.01 in+1.18 in
Sidewall height6.50 in6.60 in+0.11 in
Circumference103.65 in104.33 in+0.68 in
Revolutions per mile611.3607.3−4.0

Other pairs with one of these two in them

Each size on its own