225/45R18 vs 235/45R18Tire Size Comparison

Safe

The 1.4% diameter difference is within the accepted 3% tolerance.

225/45R18660mm dia235/45R18669mm dia+4.5mm

Comparison Details

Overall Diameter659.7 vs 668.7 mm (+9.0 mm)
Diameter Difference+1.36%
Section Width225 vs 235 mm (+10 mm)
Sidewall Height101.3 vs 105.8 mm (+4.5 mm)
Circumference2072.5 vs 2100.8 mm
Clearance Change+4.5 mm
Speedometer Error+1.36%
Revs/Mile777 vs 766

Speedometer Correction

When switching from 225/45R18 to 235/45R18, your speedometer will differ from actual speed.

SpeedometerActual SpeedDifference
30 km/h30.4 km/h+0.4 km/h
40 km/h40.5 km/h+0.5 km/h
50 km/h50.7 km/h+0.7 km/h
60 km/h60.8 km/h+0.8 km/h
70 km/h71.0 km/h+1.0 km/h
80 km/h81.1 km/h+1.1 km/h
90 km/h91.2 km/h+1.2 km/h
100 km/h101.4 km/h+1.4 km/h
110 km/h111.5 km/h+1.5 km/h
120 km/h121.6 km/h+1.6 km/h
130 km/h131.8 km/h+1.8 km/h

Vehicles Using These Sizes

Vehicles with 225/45R18

2025 BMW 3 Series330i2025 BMW 3 Series330i xDrive2024 BMW 3 Series330i2024 BMW 3 Series330i xDrive2023 BMW 3 Series330i2023 BMW 3 Series330i xDrive2022 BMW 3 Series330i2022 BMW 3 Series330i xDrive2021 BMW 3 Series330i2021 BMW 3 Series330i xDrive2020 BMW 3 Series330i2020 BMW 3 Series330i xDrive2025 Cadillac CT5Luxury2024 Cadillac CT5Luxury2023 Cadillac CT5Luxury2022 Cadillac CT5Luxury2025 Genesis G702.0T2024 Genesis G702.0T2023 Genesis G702.0T2022 Genesis G702.0T2021 Genesis G702.0T2020 Genesis G702.0T2025 Mercedes-Benz C-ClassC 3002025 Mercedes-Benz C-ClassC 300 4MATIC2024 Mercedes-Benz C-ClassC 3002024 Mercedes-Benz C-ClassC 300 4MATIC2023 Mercedes-Benz C-ClassC 3002023 Mercedes-Benz C-ClassC 300 4MATIC2022 Mercedes-Benz C-ClassC 3002022 Mercedes-Benz C-ClassC 300 4MATIC2021 Mercedes-Benz C-ClassC 3002021 Mercedes-Benz C-ClassC 300 4MATIC2020 Mercedes-Benz C-ClassC 3002020 Mercedes-Benz C-ClassC 300 4MATIC2025 Volkswagen JettaGLI2024 Volkswagen JettaGLI2023 Volkswagen JettaGLI2022 Volkswagen JettaGLI2021 Volkswagen JettaGLI2020 Volkswagen JettaGLI

Vehicles with 235/45R18

2025 Acura IntegraBase2025 Acura IntegraA-Spec Technology2024 Acura IntegraBase2024 Acura IntegraA-Spec Technology2023 Acura IntegraA-Spec Technology2025 Honda AccordSport/EX-L2024 Honda AccordSport/EX-L2023 Honda AccordSport/EX-L/Touring2022 Honda AccordSport/EX-L/Touring2021 Honda AccordSport/EX-L/Touring2020 Honda AccordSport/EX-L/Touring2026 Tesla Model 3Standard Range RWD2026 Tesla Model 3Long Range RWD2026 Tesla Model 3Long Range AWD2025 Tesla Model 3Standard Range/Long Range2024 Tesla Model 3Standard Range/Long Range2023 Tesla Model 3Standard Range Plus/Long Range2022 Tesla Model 3Standard Range Plus/Long Range2021 Tesla Model 3Standard Range Plus/Long Range2020 Tesla Model 3Standard Range Plus/Long Range2026 Toyota CamrySE2026 Toyota CamryXLE/XSE2025 Toyota CamrySE2025 Toyota CamryXLE/XSE2024 Toyota CamrySE/XSE2024 Toyota CamryXLE2023 Toyota CamryXLE/TRD2022 Toyota CamryXLE/TRD2021 Toyota CamryXLE/TRD2020 Toyota CamryXLE/TRD2025 Volvo S60Plus B5 AWD2024 Volvo S60Plus B5 AWD

Individual Tire Size Details

225/45R18
Full specifications, compatible vehicles, and alternatives
235/45R18
Full specifications, compatible vehicles, and alternatives

Practical Guidance

Switching from 225/45R18 to 235/45R18 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Both sizes fit the same 18-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 1.36%, width changes by 10mm.

Speedometer error will be 1.36%. At an indicated 100 km/h, actual speed is about 101.4 km/h.

Ground clearance changes by +4.5mm per side.