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245/40R18

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 245/40R18 tire size features an overall diameter of 25.72 inches, a section width of 9.6 inches (245mm), and rotates 784 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Audi A6.

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Physical Dimensions & Specs

Overall Diameter

25.72"

653.3 mm

Section Width

245 mm

9.65" wide

Sidewall Height

3.86"

98.0 mm (40% aspect)

Revolutions / Mile

784

Circumference: 80.79"

Rim Diameter

18"

Wheel size

Recommended Rim Width

6.1" - 8.6"

Optimal rim width range

Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 245/40R18 against any proposed tire size below:

Popular Comparisons:
Tire 1 (Stock / Base)245/40R18
Overall Height:25.7"
Sidewall:3.9"
Revs/Mile:784
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682

Visual Tire & Wheel Comparison

Tire 125.7" HeightTire 229.6" Height

Speedometer Variance

+15.0%At 60 mph reading, actual speed is 69.0 mph
IndicatedActual SpeedDiff
20 mph23.0 mph+3.0 mph
30 mph34.5 mph+4.5 mph
45 mph51.8 mph+6.8 mph
60 mph69.0 mph+9.0 mph
75 mph86.3 mph+11.3 mph
90 mph103.5 mph+13.5 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:+1.93" ground clearance

Vehicles That Fit 245/40R18 (150+ Models)

Factory standard and optional vehicle fitments utilizing 245/40R18 tires:

YearMake & ModelTrim / VariantLookup Specs
2008Audi A6Avant QuattroView 2008 A6 ›
2008Audi A6BaseView 2008 A6 ›
2008Audi A6Quattro, 4.2 VView 2008 A6 ›
2009Audi A4Base, 4D SedanView 2009 A4 ›
2009Audi A6Quattro, 4.2 VView 2009 A6 ›
2009Audi TTBase, 2D Convertible, BPY, Automatic DCTView 2009 TT ›
2009Audi TTBase, 2D Convertible, BPY, StandardView 2009 TT ›
2009Audi TTBase, 2D Convertible, CCTAView 2009 TT ›
2009Audi TTBase, 2D Coupe, BPY, Automatic DCTView 2009 TT ›
2009Audi TTBase, 2D Coupe, BPY, StandardView 2009 TT ›
2009Audi TTBase, 2D Coupe, CCTAView 2009 TT ›
2009Audi TTS Quattro, 2D ConvertibleView 2009 TT ›
2009Audi TTS Quattro, 2D CoupeView 2009 TT ›
2010Audi A42.0TView 2010 A4 ›
2010Audi A42.0T Avant QuattroView 2010 A4 ›
2010Audi A42.0T Quattro, StandardView 2010 A4 ›
2010Audi A42.0T Quattro, AutomaticView 2010 A4 ›
2010Audi A64.2 QuattroView 2010 A6 ›
2010Audi S4Automatic DCTView 2010 S4 ›
2010Audi S4StandardView 2010 S4 ›
2010Audi TTQuattro, 2D CoupeView 2010 TT ›
2010Audi TTS Quattro, 2D ConvertibleView 2010 TT ›
2010Audi TTQuattro, 2D ConvertibleView 2010 TT ›
2010Audi TTS Quattro, 2D CoupeView 2010 TT ›
2011Audi A42.0T Quattro, AutomaticView 2011 A4 ›
2011Audi A42.0TView 2011 A4 ›
2011Audi A42.0T Quattro, StandardView 2011 A4 ›
2011Audi A42.0T Avant QuattroView 2011 A4 ›
2011Audi A64.2 QuattroView 2011 A6 ›
2011Audi S4Automatic DCTView 2011 S4 ›
2011Audi S4StandardView 2011 S4 ›
2011Audi TTBase, 2D ConvertibleView 2011 TT ›
2011Audi TTBase, 2D CoupeView 2011 TT ›
2012Audi S4Automatic DCT TransView 2012 S4 ›
2012Audi S4Standard TransView 2012 S4 ›
2012Audi TTBase, 2D ConvertibleView 2012 TT ›
2012Audi TTBase, 2D CoupeView 2012 TT ›
2013Audi A4BaseView 2013 A4 ›
2013Audi S4Premium Plus, Automatic DCT TransView 2013 S4 ›
2013Audi S4Premium Plus, Standard TransView 2013 S4 ›
2013Audi S4Prestige, Automatic DCT TransView 2013 S4 ›
2013Audi S4Prestige, Standard TransView 2013 S4 ›
2013Audi S5Premium Plus, 2D ConvertibleView 2013 S5 ›
2013Audi S5Premium Plus, 2D Coupe, Automatic DCT TransView 2013 S5 ›
2013Audi S5Premium Plus, 2D Coupe, Standard TransView 2013 S5 ›
2013Audi S5Prestige, 2D ConvertibleView 2013 S5 ›
2013Audi S5Prestige, 2D Coupe, Automatic DCT TransView 2013 S5 ›
2013Audi S5Prestige, 2D Coupe, Standard TransView 2013 S5 ›
2013Audi TTPremium Plus, 2D ConvertibleView 2013 TT ›
2013Audi TTPremium Plus, 2D CoupeView 2013 TT ›
2013Audi TTPrestige, 2D ConvertibleView 2013 TT ›
2013Audi TTPrestige, 2D CoupeView 2013 TT ›
2014Audi A4 QuattroEng CD CAED, Automatic TransView 2014 A4 Quattro ›
2014Audi A5 QuattroPremium Plus, 2D Coupe, Eng CD CAED, Standard TransView 2014 A5 Quattro ›
2014Audi A4 QuattroEng CD CPMB, Automatic TransView 2014 A4 Quattro ›
2014Audi A4 QuattroEng CD CPMB, Standard TransView 2014 A4 Quattro ›
2014Audi A4 QuattroEng CD CAED, Standard TransView 2014 A4 Quattro ›
2014Audi A5PremiumView 2014 A5 ›
2014Audi A4BaseView 2014 A4 ›
2014Audi A5Premium PlusView 2014 A5 ›
2014Audi A5 QuattroPremium Plus, 2D Convertible, Eng CD CAEDView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium Plus, 2D Convertible, Eng CD CPMBView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium Plus, 2D Coupe, Eng CD CAED, Automatic TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium Plus, 2D Coupe, Eng CD CPMB, Automatic TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium Plus, 2D Coupe, Eng CD CPMB, Standard TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium, 2D Convertible, Eng CD CPMBView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium, 2D Convertible, Eng CD CAEDView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium, 2D Coupe, Eng CD CAED, Automatic TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPrestige, 2D Convertible, Eng CD CPMBView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium, 2D Coupe, Eng CD CPMB, Standard TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPrestige, 2D Convertible, Eng CD CAEDView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium, 2D Coupe, Eng CD CAED, Standard TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPremium, 2D Coupe, Eng CD CPMB, Automatic TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPrestige, 2D Coupe, Eng CD CAED, Standard TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPrestige, 2D Coupe, Eng CD CAED, Automatic TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPrestige, 2D Coupe, Eng CD CPMB, Automatic TransView 2014 A5 Quattro ›
2014Audi A5 QuattroPrestige, 2D Coupe, Eng CD CPMB, Standard TransView 2014 A5 Quattro ›
2014Audi S4Premium PlusView 2014 S4 ›
2014Audi S4Prestige, Automatic DCT TransView 2014 S4 ›
2014Audi S4Prestige, Standard TransView 2014 S4 ›
2014Audi S5Premium Plus, 2D ConvertibleView 2014 S5 ›
2014Audi S5Premium Plus, 2D Coupe, Automatic DCT TransView 2014 S5 ›
2014Audi S5Premium Plus, 2D Coupe, Standard TransView 2014 S5 ›
2014Audi S5Prestige, 2D ConvertibleView 2014 S5 ›
2014Audi S5Prestige, 2D Coupe, Automatic DCT TransView 2014 S5 ›
2014Audi S5Prestige, 2D Coupe, Standard TransView 2014 S5 ›
2014Audi TT QuattroBase, 2D ConvertibleView 2014 TT Quattro ›
2014Audi TT QuattroBase, 2D CoupeView 2014 TT Quattro ›
2015Audi A4 QuattroPrestige, Eng CD CAED, Automatic TransView 2015 A4 Quattro ›
2015Audi A4 QuattroPremium Plus, Eng CD CPMBView 2015 A4 Quattro ›
2015Audi A4 QuattroPremium Plus, Eng CD CAED, Automatic TransView 2015 A4 Quattro ›
2015Audi A4 QuattroPremium Plus, Eng CD CAED, Standard TransView 2015 A4 Quattro ›
2015Audi A4PrestigeView 2015 A4 ›
2015Audi A4 QuattroPrestige, Eng CD CPMBView 2015 A4 Quattro ›
2015Audi A4 QuattroPremium, Eng CD CPMBView 2015 A4 Quattro ›
2015Audi A4 QuattroPremium, Eng CD CAED, Automatic TransView 2015 A4 Quattro ›
2015Audi A4 QuattroPrestige, Eng CD CAED, Standard TransView 2015 A4 Quattro ›
2015Audi A4 QuattroPremium, Eng CD CAED, Standard TransView 2015 A4 Quattro ›
2015Audi A4Premium PlusView 2015 A4 ›
2015Audi A5 QuattroPremium Plus, 2D Convertible, Eng CD CPMBView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium Plus, 2D Coupe, Eng CD CAED, Automatic TransView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium Plus, 2D Convertible, Eng CD CAEDView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium Plus, 2D Coupe, Eng CD CAED, Standard TransView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium Plus, 2D Coupe, Eng CD CPMBView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium, 2D Convertible, Eng CD CAEDView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium, 2D Convertible, Eng CD CPMBView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium, 2D Coupe, Eng CD CAED, Automatic TransView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium, 2D Coupe, Eng CD CAED, Standard TransView 2015 A5 Quattro ›
2015Audi A5 QuattroPremium, 2D Coupe, Eng CD CPMBView 2015 A5 Quattro ›
2015Audi A5 QuattroPrestige, 2D Convertible, Eng CD CAEDView 2015 A5 Quattro ›
2015Audi A5 QuattroPrestige, 2D Convertible, Eng CD CPMBView 2015 A5 Quattro ›
2015Audi A5 QuattroPrestige, 2D Coupe, Eng CD CAED, Automatic TransView 2015 A5 Quattro ›
2015Audi A5 QuattroPrestige, 2D Coupe, Eng CD CAED, Standard TransView 2015 A5 Quattro ›
2015Audi A5 QuattroPrestige, 2D Coupe, Eng CD CPMBView 2015 A5 Quattro ›
2015Audi S4Premium Plus, Automatic DCT TransView 2015 S4 ›
2015Audi S4Premium Plus, Standard TransView 2015 S4 ›
2015Audi S4Prestige, Automatic DCT TransView 2015 S4 ›
2015Audi S4Prestige, Standard TransView 2015 S4 ›
2015Audi S5Premium Plus, 2D ConvertibleView 2015 S5 ›
2015Audi S5Premium Plus, 2D Coupe, Automatic DCT TransView 2015 S5 ›
2015Audi S5Premium Plus, 2D Coupe, Standard TransView 2015 S5 ›
2015Audi S5Prestige, 2D ConvertibleView 2015 S5 ›
2015Audi S5Prestige, 2D Coupe, Automatic DCT TransView 2015 S5 ›
2015Audi S5Prestige, 2D Coupe, Standard TransView 2015 S5 ›
2015Audi TT QuattroBase, 2D CoupeView 2015 TT Quattro ›
2015Audi TT QuattroBase, 2D ConvertibleView 2015 TT Quattro ›
2016Audi A4Premium PlusView 2016 A4 ›
2016Audi A4 QuattroPremium Plus, Eng CD CPMB, Automatic TransView 2016 A4 Quattro ›
2016Audi A4 QuattroPremium, Eng CD CAED, Automatic TransView 2016 A4 Quattro ›
2016Audi A4 QuattroPremium Plus, Eng CD CAED, Automatic TransView 2016 A4 Quattro ›
2016Audi A4 QuattroPremium Plus, Eng CD CPMB, Standard TransView 2016 A4 Quattro ›
2016Audi A4 QuattroPremium Plus, Eng CD CAED, Standard TransView 2016 A4 Quattro ›
2016Audi A4 QuattroPremium, Eng CD CPMB, Automatic TransView 2016 A4 Quattro ›
2016Audi A4 QuattroPremium, Eng CD CPMB, Standard TransView 2016 A4 Quattro ›
2016Audi A4 QuattroPremium, Eng CD CAED, Standard TransView 2016 A4 Quattro ›
2016Audi A5 QuattroPremium Plus, 2D Convertible, 2.0L Eng VIN 2View 2016 A5 Quattro ›
2016Audi A5 QuattroPremium Plus, 2D Convertible, 2.0L Eng VIN GView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium Plus, 2D Coupe, 2.0L Eng VIN 2, Automatic TransView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium Plus, 2D Coupe, 2.0L Eng VIN G, Automatic TransView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium Plus, 2D Coupe, 2.0L Eng VIN G, Standard TransView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium Plus, 2D Coupe, 2.0L Eng VIN 2, Standard TransView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium, 2D Convertible, 2.0L Eng VIN 2View 2016 A5 Quattro ›
2016Audi A5 QuattroPremium, 2D Convertible, 2.0L Eng VIN GView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium, 2D Coupe, 2.0L Eng VIN 2, Standard TransView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium, 2D Coupe, 2.0L Eng VIN 2, Automatic TransView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium, 2D Coupe, 2.0L Eng VIN G, Automatic TransView 2016 A5 Quattro ›
2016Audi A5 QuattroPremium, 2D Coupe, 2.0L Eng VIN G, Standard TransView 2016 A5 Quattro ›
2016Audi S4Premium Plus, Automatic DCT TransView 2016 S4 ›
2016Audi S4Premium Plus, Standard TransView 2016 S4 ›
2016Audi S4Prestige, Automatic DCT TransView 2016 S4 ›