255/50R20 vs 275/50R20Tire Size Comparison

Safe

The 2.6% diameter difference is within the accepted 3% tolerance.

255/50R20763mm dia275/50R20783mm dia+10.0mm

Comparison Details

Overall Diameter763.0 vs 783.0 mm (+20.0 mm)
Diameter Difference+2.62%
Section Width255 vs 275 mm (+20 mm)
Sidewall Height127.5 vs 137.5 mm (+10.0 mm)
Circumference2397.0 vs 2459.9 mm
Clearance Change+10.0 mm
Speedometer Error+2.62%
Revs/Mile671 vs 654

Speedometer Correction

When switching from 255/50R20 to 275/50R20, your speedometer will differ from actual speed.

SpeedometerActual SpeedDifference
30 km/h30.8 km/h+0.8 km/h
40 km/h41.0 km/h+1.0 km/h
50 km/h51.3 km/h+1.3 km/h
60 km/h61.6 km/h+1.6 km/h
70 km/h71.8 km/h+1.8 km/h
80 km/h82.1 km/h+2.1 km/h
90 km/h92.4 km/h+2.4 km/h
100 km/h102.6 km/h+2.6 km/h
110 km/h112.9 km/h+2.9 km/h
120 km/h123.1 km/h+3.1 km/h
130 km/h133.4 km/h+3.4 km/h

Vehicles Using These Sizes

Vehicles with 255/50R20

2025 Acura MDXTechnology2025 Acura MDXA-Spec2024 Acura MDXTechnology2023 Acura MDXTechnology2022 Acura MDXTechnology2021 Acura MDXTechnology2020 Acura MDXTechnology2025 Audi Q7Premium Plus 55 TFSI quattro2024 Audi Q7Premium Plus 55 TFSI quattro2021 Audi Q7Premium Plus 55 TFSI quattro2020 Audi Q7Premium Plus 55 TFSI quattro2025 Honda PilotEX-L/Touring/Elite2024 Honda PilotEX-L/Touring/Elite2023 Honda PilotTouring/Elite/TrailSport2022 Honda PilotTouring/Elite/TrailSport2025 Infiniti QX60Luxe2025 Infiniti QX60Autograph2024 Infiniti QX60Luxe2024 Infiniti QX60Autograph2023 Infiniti QX60Luxe2022 Infiniti QX60Luxe2025 Kia TellurideSX/SX Prestige/X-Line/X-Pro2024 Kia TellurideSX/SX Prestige/X-Line/X-Pro2023 Kia TellurideSX/SX Prestige/X-Line/X-Pro2022 Kia TellurideSX/SX Prestige2021 Kia TellurideSX/SX Prestige2020 Kia TellurideSX/SX Prestige

Individual Tire Size Details

255/50R20
Full specifications, compatible vehicles, and alternatives
275/50R20
Full specifications, compatible vehicles, and alternatives

Practical Guidance

Switching from 255/50R20 to 275/50R20 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Both sizes fit the same 20-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 2.62%, width changes by 20mm.

Speedometer error will be 2.62%. At an indicated 100 km/h, actual speed is about 102.6 km/h.

Ground clearance changes by +10.0mm per side.