275/70R17 vs 285/70R17Tire Size Comparison

Safe

The 1.7% diameter difference is within the accepted 3% tolerance.

275/70R17817mm dia285/70R17831mm dia+7.0mm

Comparison Details

Overall Diameter816.8 vs 830.8 mm (+14.0 mm)
Diameter Difference+1.71%
Section Width275 vs 285 mm (+10 mm)
Sidewall Height192.5 vs 199.5 mm (+7.0 mm)
Circumference2566.1 vs 2610.0 mm
Clearance Change+7.0 mm
Speedometer Error+1.71%
Revs/Mile627 vs 617

Speedometer Correction

When switching from 275/70R17 to 285/70R17, your speedometer will differ from actual speed.

SpeedometerActual SpeedDifference
30 km/h30.5 km/h+0.5 km/h
40 km/h40.7 km/h+0.7 km/h
50 km/h50.9 km/h+0.9 km/h
60 km/h61.0 km/h+1.0 km/h
70 km/h71.2 km/h+1.2 km/h
80 km/h81.4 km/h+1.4 km/h
90 km/h91.5 km/h+1.5 km/h
100 km/h101.7 km/h+1.7 km/h
110 km/h111.9 km/h+1.9 km/h
120 km/h122.1 km/h+2.1 km/h
130 km/h132.2 km/h+2.2 km/h

Vehicles Using These Sizes

Vehicles with 285/70R17

2025 Jeep WranglerRubicon2025 Jeep WranglerRubicon 3922024 Jeep WranglerRubicon2023 Jeep WranglerRubicon/Rubicon 3922022 Jeep WranglerRubicon/Rubicon 3922021 Jeep WranglerRubicon2020 Jeep WranglerRubicon

Practical Guidance

Switching from 275/70R17 to 285/70R17 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Both sizes fit the same 17-inch rim, so no wheel change is needed.

The 3% diameter tolerance is a widely accepted industry guideline referenced by the ETRTO and most vehicle manufacturers. When in doubt, consult your vehicle's owner's manual or a qualified tire professional. For U.S. tire safety standards and recalls, see the NHTSA Tire Safety page.

Frequently Asked Questions

Safe. The overall diameter differs by 1.71%, width changes by 10mm.

Speedometer error will be 1.71%. At an indicated 100 km/h, actual speed is about 101.7 km/h.

Ground clearance changes by +7.0mm per side.