Popular truck and SUV comparison

265/65R18 vs 275/65R18

A 275/65R18 tire is wider and a little taller than a 265/65R18 tire, a common comparison for trucks, SUVs, and light-duty all-terrain setups.

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The calculator opens with 265/65R18 and 275/65R18 already filled in, including the visual tire diagram, speedometer gauge, metric toggle, and share link.

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Good match The overall diameter change is modest, but confirm the added width works with the wheel width, offset, and inner clearance.

265/65R18 vs 275/65R18 dimensions summary
Measurement	265/65R18	275/65R18
Overall diameter	31.56 in	32.07 in
Sidewall height	6.78 in	7.04 in
Circumference	99.16 in	100.77 in
Revolutions per mile	639	629
Ground clearance change	0.00 in	+0.26 in
Diameter difference	0.0%	+1.6%

Height change +0.51 in +13 mm overall diameter

Speedometer at 60 mph 61.0 mph 1.0 mph difference

Diameter difference +1.6% The overall diameter is within 3%, which is usually a reasonable target for a tire size change.

What changes between 265/65R18 and 275/65R18?

The main difference is overall diameter. 275/65R18 measures 32.07 in across, compared with 31.56 in for 265/65R18. That creates a +1.6% diameter change and a +0.26 in ground clearance change.

At an indicated 60 mph, this comparison estimates an actual speed of 61.0 mph. Use the live calculator before buying tires so you can review the visual clearance change, speedometer numbers, and shareable comparison link in one place.