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225/40R18

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 225/40R18 tire size features an overall diameter of 25.09 inches, a section width of 8.9 inches (225mm), and rotates 804 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Acura ILX.

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Physical Dimensions & Specs

Overall Diameter

25.09"

637.3 mm

Section Width

225 mm

8.86" wide

Sidewall Height

3.54"

89.9 mm (40% aspect)

Revolutions / Mile

804

Circumference: 78.81"

Rim Diameter

18"

Wheel size

Recommended Rim Width

5.6" - 7.9"

Optimal rim width range

Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 225/40R18 against any proposed tire size below:

Popular Comparisons:
Tire 1 (Stock / Base)225/40R18
Overall Height:25.1"
Sidewall:3.5"
Revs/Mile:804
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682

Visual Tire & Wheel Comparison

Tire 125.1" HeightTire 229.6" Height

Speedometer Variance

+17.9%At 60 mph reading, actual speed is 70.7 mph
IndicatedActual SpeedDiff
20 mph23.6 mph+3.6 mph
30 mph35.4 mph+5.4 mph
45 mph53.1 mph+8.1 mph
60 mph70.7 mph+10.7 mph
75 mph88.4 mph+13.4 mph
90 mph106.1 mph+16.1 mph

Fender & Suspension Clearance

Fitment Status: MODERATE RISK

Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.

Inner Strut Space:7.7mm LESS clearance
Outer Fender Push:Extends 17.7mm further out
Ride Height Delta:+2.24" ground clearance

Vehicles That Fit 225/40R18 (150+ Models)

Factory standard and optional vehicle fitments utilizing 225/40R18 tires:

YearMake & ModelTrim / VariantLookup Specs
2016Acura ILXILXView 2016 ILX ›
2017Acura ILXILXView 2017 ILX ›
2018Acura ILXILXView 2018 ILX ›
2019Acura ILXILXView 2019 ILX ›
2020Acura ILXILXView 2020 ILX ›
2021Acura ILXILXView 2021 ILX ›
2022Acura ILXILXView 2022 ILX ›
2002Audi TTQuattro, 2D ConvertibleView 2002 TT ›
2002Audi TTQuattro, 2D Coupe, 1.8 TView 2002 TT ›
2004Audi TTBase, 2D ConvertibleView 2004 TT ›
2004Audi TTBase, 2D CoupeView 2004 TT ›
2004Audi TTQuattro, 2D Convertible, 1.8 TView 2004 TT ›
2004Audi TTQuattro, 2D Coupe, 1.8 TView 2004 TT ›
2004Audi TTQuattro, 2D Coupe, 3.2 FView 2004 TT ›
2005Audi TTBase, 2D ConvertibleView 2005 TT ›
2005Audi TTBase, 2D CoupeView 2005 TT ›
2005Audi TTQuattro, 2D Convertible, 1.8 TView 2005 TT ›
2005Audi TTQuattro, 2D Coupe, 1.8 TView 2005 TT ›
2005Audi TTQuattro, 2D Coupe, 3.2 FView 2005 TT ›
2006Audi TTQuattro, 2D Convertible, 3.2 DView 2006 TT ›
2006Audi TTQuattro, 2D Coupe, 3.2 DView 2006 TT ›
2015Audi A3Premium Plus, 4D SedanView 2015 A3 ›
2015Audi A3Premium Plus, 2D ConvertibleView 2015 A3 ›
2015Audi A3Prestige, 4D SedanView 2015 A3 ›
2015Audi A3Prestige, 2D ConvertibleView 2015 A3 ›
2015Audi A3TDI Premium PlusView 2015 A3 ›
2015Audi A3TDI PrestigeView 2015 A3 ›
2015Audi A3 QuattroPrestige, 2D ConvertibleView 2015 A3 Quattro ›
2015Audi A3 QuattroPrestige, 4D SedanView 2015 A3 Quattro ›
2015Audi A3 QuattroPremium Plus, 2D ConvertibleView 2015 A3 Quattro ›
2015Audi A3 QuattroPremium Plus, 4D SedanView 2015 A3 Quattro ›
2015Audi S3Premium PlusView 2015 S3 ›
2015Audi S3PrestigeView 2015 S3 ›
2016Audi A3Premium Plus, 2D Convertible, 1.8L Eng VIN 7View 2016 A3 ›
2016Audi A3Premium Plus, 4D Sedan, 1.8L Eng VIN 7View 2016 A3 ›
2016Audi A3Premium Plus, 4D Sedan, 2.0L Eng VIN 8View 2016 A3 ›
2016Audi A3Prestige, 2D Convertible, 1.8L Eng VIN 7View 2016 A3 ›
2016Audi A3Premium Plus, 2D Convertible, 2.0L Eng VIN 8View 2016 A3 ›
2016Audi A3Prestige, 2D Convertible, 2.0L Eng VIN 8View 2016 A3 ›
2016Audi A3 QuattroPremium Plus, 4D SedanView 2016 A3 Quattro ›
2016Audi A3Prestige, 4D Sedan, 1.8L Eng VIN 7View 2016 A3 ›
2016Audi A3TDI PrestigeView 2016 A3 ›
2016Audi A3 QuattroPrestige, 2D ConvertibleView 2016 A3 Quattro ›
2016Audi A3 QuattroPremium Plus, 2D ConvertibleView 2016 A3 Quattro ›
2016Audi A3TDI Premium PlusView 2016 A3 ›
2016Audi A3Prestige, 4D Sedan, 2.0L Eng VIN 8View 2016 A3 ›
2016Audi A3 QuattroPrestige, 4D SedanView 2016 A3 Quattro ›
2016Audi S3Premium PlusView 2016 S3 ›
2016Audi S3PrestigeView 2016 S3 ›
2017Audi A3Premium Plus, 4D SedanView 2017 A3 ›
2017Audi A3Premium Plus, 2D ConvertibleView 2017 A3 ›
2017Audi A3Prestige, 2D ConvertibleView 2017 A3 ›
2017Audi A3Prestige, 4D SedanView 2017 A3 ›
2017Audi A3 QuattroPremium Plus, 2D ConvertibleView 2017 A3 Quattro ›
2017Audi A3 QuattroPremium Plus, 4D SedanView 2017 A3 Quattro ›
2017Audi A3 QuattroPrestige, 2D ConvertibleView 2017 A3 Quattro ›
2017Audi A3 QuattroPrestige, 4D SedanView 2017 A3 Quattro ›
2017Audi S3Premium PlusView 2017 S3 ›
2017Audi S3PrestigeView 2017 S3 ›
2018Audi A3Premium Plus, 4D SedanView 2018 A3 ›
2018Audi A3Premium Plus, 2D ConvertibleView 2018 A3 ›
2018Audi A3Prestige, 2D ConvertibleView 2018 A3 ›
2018Audi A3 QuattroPremium Plus, 2D ConvertibleView 2018 A3 Quattro ›
2018Audi A3Prestige, 4D SedanView 2018 A3 ›
2018Audi A3 QuattroPremium Plus, 4D SedanView 2018 A3 Quattro ›
2018Audi A3 QuattroPrestige, 4D SedanView 2018 A3 Quattro ›
2018Audi A3 QuattroPrestige, 2D ConvertibleView 2018 A3 Quattro ›
2018Audi S3Premium PlusView 2018 S3 ›
2018Audi S3PrestigeView 2018 S3 ›
2019Audi A3Premium Plus, 2D ConvertibleView 2019 A3 ›
2019Audi A3Premium Plus, 4D SedanView 2019 A3 ›
2019Audi A3Prestige, 4D SedanView 2019 A3 ›
2019Audi A3Prestige, 2D ConvertibleView 2019 A3 ›
2019Audi A3TitaniumView 2019 A3 ›
2019Audi A3 QuattroPremium Plus, 2D ConvertibleView 2019 A3 Quattro ›
2019Audi A3 QuattroPremium Plus, 4D SedanView 2019 A3 Quattro ›
2019Audi A3 QuattroPrestige, 2D ConvertibleView 2019 A3 Quattro ›
2019Audi A3 QuattroPrestige, 4D SedanView 2019 A3 Quattro ›
2019Audi S3Premium PlusView 2019 S3 ›
2019Audi S3PrestigeView 2019 S3 ›
2020Audi A3 QuattroPremiumView 2020 A3 Quattro ›
2020Audi A3PremiumView 2020 A3 ›
2020Audi A3Premium PlusView 2020 A3 ›
2020Audi A3 QuattroPremium PlusView 2020 A3 Quattro ›
2020Audi S3PremiumView 2020 S3 ›
2020Audi S3Premium PlusView 2020 S3 ›
2022Audi S3PremiumView 2022 S3 ›
2022Audi S3Premium PlusView 2022 S3 ›
2022Audi S3PrestigeView 2022 S3 ›
2023Audi S3PremiumView 2023 S3 ›
2023Audi S3Premium PlusView 2023 S3 ›
2023Audi S3PrestigeView 2023 S3 ›
2024Audi A3PremiumView 2024 A3 ›
2024Audi A3Premium PlusView 2024 A3 ›
2024Audi A3 QuattroPremium PlusView 2024 A3 Quattro ›
2024Audi A3 QuattroPremiumView 2024 A3 Quattro ›
2024Audi S3PremiumView 2024 S3 ›
2024Audi S3Premium PlusView 2024 S3 ›
2024Audi S3PrestigeView 2024 S3 ›
2025Audi A3 QuattroPremiumView 2025 A3 Quattro ›
2025Audi A3 QuattroPremium PlusView 2025 A3 Quattro ›
2025Audi S3PremiumView 2025 S3 ›
2025Audi S3Premium PlusView 2025 S3 ›
2025Audi S3PrestigeView 2025 S3 ›
2006BMW 330xiAutomaticView 2006 330xi ›
2006BMW 330Ci2D Coupe, AutomaticView 2006 330Ci ›
2006BMW 330Ci2D Convertible, AutomaticView 2006 330Ci ›
2006BMW 330iAutomaticView 2006 330i ›
2006BMW 330Ci2D Coupe, StandardView 2006 330Ci ›
2006BMW 330Ci2D Convertible, StandardView 2006 330Ci ›
2006BMW 330xiStandardView 2006 330xi ›
2006BMW 330iStandardView 2006 330i ›
2006BMW Z42D Convertible, AutomaticView 2006 Z4 ›
2006BMW Z42D Convertible, Standard, GS617BGView 2006 Z4 ›
2006BMW Z42D Coupe, AutomaticView 2006 Z4 ›
2006BMW Z42D Convertible, Standard, GS637BZView 2006 Z4 ›
2006BMW Z42D Coupe, StandardView 2006 Z4 ›
2006BMW M CoupeM CoupeView 2006 M Coupe ›
2006BMW M RoadsterM RoadsterView 2006 M Roadster ›
2007BMW 335i2D Convertible, AutomaticView 2007 335i ›
2007BMW 335i2D Convertible, StandardView 2007 335i ›
2007BMW 335i2D Coupe, AutomaticView 2007 335i ›
2007BMW 335i2D Coupe, StandardView 2007 335i ›
2007BMW 335i4D Sedan, AutomaticView 2007 335i ›
2007BMW 335i4D Sedan, StandardView 2007 335i ›
2007BMW 335xiAutomaticView 2007 335xi ›
2007BMW 335xiStandardView 2007 335xi ›
2007BMW Z42D Convertible, AutomaticView 2007 Z4 ›
2007BMW Z42D Coupe, StandardView 2007 Z4 ›
2007BMW Z42D Convertible, Standard, GS637BZView 2007 Z4 ›
2007BMW Z42D Convertible, Standard, GS617BGView 2007 Z4 ›
2007BMW Z42D Coupe, AutomaticView 2007 Z4 ›
2008BMW 328i2D Convertible, N51, AutomaticView 2008 328i ›
2008BMW 328i2D Convertible, N51, StandardView 2008 328i ›
2008BMW 328i2D Convertible, N52, AutomaticView 2008 328i ›
2008BMW 328i2D Convertible, N52, StandardView 2008 328i ›
2008BMW 328i2D Coupe, N51, AutomaticView 2008 328i ›
2008BMW 328i2D Coupe, N51, StandardView 2008 328i ›
2008BMW 328i2D Coupe, N52, AutomaticView 2008 328i ›
2008BMW 328i2D Coupe, N52, StandardView 2008 328i ›
2008BMW 328xi2D Coupe, N51, AutomaticView 2008 328xi ›
2008BMW 328xi2D Coupe, N51, StandardView 2008 328xi ›
2008BMW 328xi2D Coupe, N52, StandardView 2008 328xi ›
2008BMW 328xi2D Coupe, N52, AutomaticView 2008 328xi ›
2008BMW 335i2D Convertible, AutomaticView 2008 335i ›
2008BMW 335i2D Convertible, StandardView 2008 335i ›
2008BMW 335i2D Coupe, AutomaticView 2008 335i ›
2008BMW 335i2D Coupe, StandardView 2008 335i ›
2008BMW 335i4D Sedan, AutomaticView 2008 335i ›
2008BMW 335i4D Sedan, StandardView 2008 335i ›