285/35R18 vs 295/35R18

295/35R18 is 0.28 in (7.0 mm) taller than 285/35R18, a +1.07% diameter difference. With the speedometer set for 285/35R18, an indicated 60 mph is 60.6 mph on 295/35R18.

Is this a safe swap?

Diameter difference +1.07%: within the ±3% guideline

By overall diameter alone, 295/35R18 falls inside the ±3% range commonly used as a guideline when replacing 285/35R18. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

285/35R18 vs 295/35R18 differences
Measurement	285/35R18	295/35R18	Difference	% diff
Overall diameter	25.85 in (656.7 mm)	26.13 in (663.7 mm)	+0.28 in (+7.0 mm)	+1.07%
Sidewall height	3.93 in (99.8 mm)	4.06 in (103.3 mm)	+0.14 in (+3.5 mm)	+3.51%
Section width	11.22 in (285.0 mm)	11.61 in (295.0 mm)	+0.39 in (+10.0 mm)	+3.51%
Circumference	81.22 in (2,063.1 mm)	82.09 in (2,085.1 mm)	+0.87 in (+22.0 mm)	+1.07%
Revolutions per mile	780	772	−8	−1.05%

True speed with the speedometer calibrated for 285/35R18
Indicated	Actual on 285/35R18	Actual on 295/35R18	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 295/35R18 raises the vehicle by 0.14 in (3.5 mm) at the axle (half the +7.0 mm diameter difference).

295/35R18 is 0.28 in taller than 285/35R18 and 10 mm wider, a 1.07% difference in overall diameter.

With the speedometer calibrated for 285/35R18, an indicated 60 mph is actually 60.6 mph on 295/35R18, and revolutions per mile change from 780 to 772.

Both sizes mount on 18-inch wheels.

Size pages

Other comparisons with 285/35R18

Other comparisons with 295/35R18

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.