285/70R18 vs 295/70R18

295/70R18 is 0.55 in (14.0 mm) taller than 285/70R18, a +1.64% diameter difference. With the speedometer set for 285/70R18, an indicated 60 mph is 61.0 mph on 295/70R18.

Is this a safe swap?

Diameter difference +1.64%: within the ±3% guideline

By overall diameter alone, 295/70R18 falls inside the ±3% range commonly used as a guideline when replacing 285/70R18. 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.

285/70R18 vs 295/70R18 differences
Measurement	285/70R18	295/70R18	Difference	% diff
Overall diameter	33.71 in (856.2 mm)	34.26 in (870.2 mm)	+0.55 in (+14.0 mm)	+1.64%
Sidewall height	7.85 in (199.5 mm)	8.13 in (206.5 mm)	+0.28 in (+7.0 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	105.90 in (2,689.8 mm)	107.63 in (2,733.8 mm)	+1.73 in (+44.0 mm)	+1.64%
Revolutions per mile	598	589	−10	−1.61%

True speed with the speedometer calibrated for 285/70R18
Indicated	Actual on 285/70R18	Actual on 295/70R18	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.0 mph	+1.0 mph
75 mph	75.0 mph	76.2 mph	+1.2 mph

Ride-height change: 295/70R18 raises the vehicle by 0.28 in (7.0 mm) at the axle (half the +14.0 mm diameter difference).

295/70R18 is 0.55 in taller than 285/70R18 and 10 mm wider, a 1.64% difference in overall diameter.

With the speedometer calibrated for 285/70R18, an indicated 60 mph is actually 61.0 mph on 295/70R18, and revolutions per mile change from 598 to 589.

Both sizes mount on 18-inch wheels.

Size pages

Other comparisons with 285/70R18

Other comparisons with 295/70R18

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