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225/45R18

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 225/45R18 tire size features an overall diameter of 25.97 inches, a section width of 8.9 inches (225mm), and rotates 777 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Alfa Romeo Giulia.

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Physical Dimensions & Specs

Overall Diameter

25.97"

659.6 mm

Section Width

225 mm

8.86" wide

Sidewall Height

3.99"

101.3 mm (45% aspect)

Revolutions / Mile

777

Circumference: 81.59"

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 225/45R18 against any proposed tire size below:

Popular Comparisons:
Tire 1 (Stock / Base)225/45R18
Overall Height:26.0"
Sidewall:4.0"
Revs/Mile:777
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682

Visual Tire & Wheel Comparison

Tire 126.0" HeightTire 229.6" Height

Speedometer Variance

+13.9%At 60 mph reading, actual speed is 68.3 mph
IndicatedActual SpeedDiff
20 mph22.8 mph+2.8 mph
30 mph34.2 mph+4.2 mph
45 mph51.2 mph+6.2 mph
60 mph68.3 mph+8.3 mph
75 mph85.4 mph+10.4 mph
90 mph102.5 mph+12.5 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:+1.80" ground clearance

Vehicles That Fit 225/45R18 (150+ Models)

Factory standard and optional vehicle fitments utilizing 225/45R18 tires:

YearMake & ModelTrim / VariantLookup Specs
2017Alfa Romeo GiuliaTi, AWDView 2017 Giulia ›
2017Alfa Romeo GiuliaTi, RWDView 2017 Giulia ›
2018Alfa Romeo GiuliaTi, AWDView 2018 Giulia ›
2018Alfa Romeo GiuliaTi, RWDView 2018 Giulia ›
2019Alfa Romeo GiuliaSport, RWDView 2019 Giulia ›
2019Alfa Romeo GiuliaSport, AWDView 2019 Giulia ›
2019Alfa Romeo GiuliaTi, AWDView 2019 Giulia ›
2019Alfa Romeo GiuliaTi, RWDView 2019 Giulia ›
2020Alfa Romeo GiuliaTi, AWDView 2020 Giulia ›
2020Alfa Romeo GiuliaSport, RWDView 2020 Giulia ›
2020Alfa Romeo GiuliaTi, RWDView 2020 Giulia ›
2020Alfa Romeo GiuliaSport, AWDView 2020 Giulia ›
2021Alfa Romeo GiuliaTi, AWDView 2021 Giulia ›
2021Alfa Romeo GiuliaTi, RWDView 2021 Giulia ›
2022Alfa Romeo GiuliaTi, AWDView 2022 Giulia ›
2022Alfa Romeo GiuliaTi, RWDView 2022 Giulia ›
2023Alfa Romeo GiuliaTi, RWDView 2023 Giulia ›
2023Alfa Romeo GiuliaTi, AWDView 2023 Giulia ›
2024Alfa Romeo GiuliaTi, AWDView 2024 Giulia ›
2024Alfa Romeo GiuliaTi, RWDView 2024 Giulia ›
2025Alfa Romeo GiuliaBase, AWDView 2025 Giulia ›
2025Alfa Romeo GiuliaBase, RWDView 2025 Giulia ›
2001BMW M32D CoupeView 2001 M3 ›
2001BMW M32D ConvertibleView 2001 M3 ›
2002BMW M32D ConvertibleView 2002 M3 ›
2002BMW M32D CoupeView 2002 M3 ›
2003BMW M32D ConvertibleView 2003 M3 ›
2003BMW M32D CoupeView 2003 M3 ›
2004BMW M32D Convertible, S6View 2004 M3 ›
2004BMW M32D Convertible, S6S420GView 2004 M3 ›
2004BMW M32D Coupe, S6View 2004 M3 ›
2004BMW M32D Coupe, S6S420GView 2004 M3 ›
2005BMW M32D Convertible, S6View 2005 M3 ›
2005BMW M32D Convertible, S6S420GView 2005 M3 ›
2005BMW M32D Coupe, S6View 2005 M3 ›
2005BMW M32D Coupe, S6S420GView 2005 M3 ›
2006BMW M32D Coupe, S6S420G (SMG)View 2006 M3 ›
2006BMW M32D Convertible, S6S420G (SMG)View 2006 M3 ›
2006BMW M32D Convertible, S6S420GView 2006 M3 ›
2006BMW M32D Coupe, S6S420GView 2006 M3 ›
2007BMW M CoupeM CoupeView 2007 M Coupe ›
2007BMW M RoadsterM RoadsterView 2007 M Roadster ›
2008BMW M CoupeM CoupeView 2008 M Coupe ›
2008BMW M RoadsterM RoadsterView 2008 M Roadster ›
2012BMW 328i4D Sedan, Eng CD N20, Automatic TransView 2012 328i ›
2012BMW 328i4D Sedan, Eng CD N20, Standard TransView 2012 328i ›
2012BMW 328i4D Sedan, Eng CD N26View 2012 328i ›
2012BMW 335i4D Sedan, Automatic TransView 2012 335i ›
2012BMW 335i4D Sedan, Standard TransView 2012 335i ›
2013BMW 320iAutomatic TransView 2013 320i ›
2013BMW 320iStandard TransView 2013 320i ›
2013BMW 328i4D Sedan, Eng CD N20, Automatic TransView 2013 328i ›
2013BMW 328i4D Sedan, Eng CD N20, Standard TransView 2013 328i ›
2013BMW 328i4D Sedan, Eng CD N26View 2013 328i ›
2013BMW 328xi4D Sedan, Eng CD N20View 2013 328xi ›
2013BMW 328xi4D Sedan, Eng CD N26View 2013 328xi ›
2013BMW 335i4D Sedan, Automatic TransView 2013 335i ›
2013BMW 335i4D Sedan, Standard TransView 2013 335i ›
2013BMW 335xi4D Sedan, Automatic TransView 2013 335xi ›
2013BMW 335xi4D Sedan, Standard TransView 2013 335xi ›
2013BMW X128iView 2013 X1 ›
2013BMW X128isView 2013 X1 ›
2013BMW X135iView 2013 X1 ›
2013BMW 320xi320xiView 2013 320xi ›
2013BMW ActiveHybrid 3ActiveHybrid 3View 2013 ActiveHybrid 3 ›
2014BMW 328d xDrive4D WagonView 2014 328d xDrive ›
2014BMW 328d xDrive4D SedanView 2014 328d xDrive ›
2014BMW 335iStandard TransView 2014 335i ›
2014BMW 328iEng CD N20B20A, Standard TransView 2014 328i ›
2014BMW 328i xDrive4D Wagon, 2.0L Eng VIN CView 2014 328i xDrive ›
2014BMW 335i xDriveAutomatic TransView 2014 335i xDrive ›
2014BMW 328i xDrive4D Wagon, 2.0L Eng, Eng CD N26View 2014 328i xDrive ›
2014BMW 328iEng CD N20B20A, Automatic TransView 2014 328i ›
2014BMW 328i xDrive4D Sedan, Eng CD N20B20AView 2014 328i xDrive ›
2014BMW 335iAutomatic TransView 2014 335i ›
2014BMW 335i xDriveStandard TransView 2014 335i xDrive ›
2014BMW 328i xDrive4D Wagon, 2.0L Eng, Eng CD N20B20AView 2014 328i xDrive ›
2014BMW 328iEng CD N26B20AView 2014 328i ›
2014BMW 328i xDrive4D Sedan, Eng CD N26B20AView 2014 328i xDrive ›
2014BMW 435i2D ConvertibleView 2014 435i ›
2014BMW 435i2D Coupe, Automatic TransView 2014 435i ›
2014BMW 435i2D Coupe, Standard TransView 2014 435i ›
2014BMW 435i xDriveAutomatic TransView 2014 435i xDrive ›
2014BMW 435i xDriveStandard TransView 2014 435i xDrive ›
2014BMW X1sDrive28iView 2014 X1 ›
2014BMW X1xDrive28iView 2014 X1 ›
2014BMW X1xDrive35iView 2014 X1 ›
2014BMW 328d328dView 2014 328d ›
2014BMW ActiveHybrid 3ActiveHybrid 3View 2014 ActiveHybrid 3 ›
2015BMW 335iStandard TransView 2015 335i ›
2015BMW 328i xDrive4D Sedan, Eng CD N20B20AView 2015 328i xDrive ›
2015BMW 328i xDrive4D Wagon, Eng CD N26B20AView 2015 328i xDrive ›
2015BMW 335iAutomatic TransView 2015 335i ›
2015BMW 328i xDrive4D Wagon, Eng CD N20B20AView 2015 328i xDrive ›
2015BMW 328i xDrive4D Sedan, Eng CD N26B20AView 2015 328i xDrive ›
2015BMW 328iEng CD N26B20AView 2015 328i ›
2015BMW 328iEng CD N20B20A, Automatic TransView 2015 328i ›
2015BMW 328iEng CD N20B20A, Standard TransView 2015 328i ›
2015BMW 328d xDrive4D SedanView 2015 328d xDrive ›
2015BMW 328d xDrive4D WagonView 2015 328d xDrive ›
2015BMW 335i xDriveAutomatic TransView 2015 335i xDrive ›
2015BMW 335i xDriveStandard TransView 2015 335i xDrive ›
2015BMW 428i Gran CoupeEng CD N20B20AView 2015 428i Gran Coupe ›
2015BMW 428i Gran CoupeEng CD N26B20AView 2015 428i Gran Coupe ›
2015BMW 428i Gran Coupe xDriveEng CD N20B20AView 2015 428i Gran Coupe xDrive ›
2015BMW 428i Gran Coupe xDriveEng CD N26B20AView 2015 428i Gran Coupe xDrive ›
2015BMW 435i2D ConvertibleView 2015 435i ›
2015BMW 435i2D Coupe, Automatic TransView 2015 435i ›
2015BMW 435i2D Coupe, Standard TransView 2015 435i ›
2015BMW 435i xDrive2D ConvertibleView 2015 435i xDrive ›
2015BMW 435i xDrive2D Coupe, Automatic TransView 2015 435i xDrive ›
2015BMW 435i xDrive2D Coupe, Standard TransView 2015 435i xDrive ›
2015BMW X1sDrive28iView 2015 X1 ›
2015BMW X1xDrive28iView 2015 X1 ›
2015BMW X1xDrive35iView 2015 X1 ›
2015BMW 328d328dView 2015 328d ›
2015BMW 435i Gran Coupe435i Gran CoupeView 2015 435i Gran Coupe ›
2015BMW 435i Gran Coupe xDrive435i Gran Coupe xDriveView 2015 435i Gran Coupe xDrive ›
2015BMW ActiveHybrid 3ActiveHybrid 3View 2015 ActiveHybrid 3 ›
2016BMW 340iAutomatic TransView 2016 340i ›
2016BMW 340i xDriveAutomatic TransView 2016 340i xDrive ›
2016BMW 340i xDriveStandard TransView 2016 340i xDrive ›
2016BMW 340iStandard TransView 2016 340i ›
2016BMW 428i2D ConvertibleView 2016 428i ›
2016BMW 428i xDrive2D Convertible, Eng CD N26B20AView 2016 428i xDrive ›
2016BMW 428i2D Coupe, Eng CD N26B20AView 2016 428i ›
2016BMW 428i xDrive2D Convertible, Eng CD N20B20AView 2016 428i xDrive ›
2016BMW 428i Gran CoupeEng CD N20B20AView 2016 428i Gran Coupe ›
2016BMW 428i Gran Coupe xDriveEng CD N26B20AView 2016 428i Gran Coupe xDrive ›
2016BMW 428i2D Coupe, Eng CD N20B20AView 2016 428i ›
2016BMW 428i xDrive2D Coupe, Eng CD N26B20AView 2016 428i xDrive ›
2016BMW 428i xDrive2D Coupe, Eng CD N20B20AView 2016 428i xDrive ›
2016BMW 428i Gran Coupe xDriveEng CD N20B20AView 2016 428i Gran Coupe xDrive ›
2016BMW 428i Gran CoupeEng CD N26B20AView 2016 428i Gran Coupe ›
2016BMW 435i2D ConvertibleView 2016 435i ›
2016BMW 435i2D Coupe, Automatic TransView 2016 435i ›
2016BMW 435i2D Coupe, Standard TransView 2016 435i ›
2016BMW 435i xDrive2D ConvertibleView 2016 435i xDrive ›
2016BMW 435i xDrive2D Coupe, Automatic TransView 2016 435i xDrive ›
2016BMW 435i xDrive2D Coupe, Standard TransView 2016 435i xDrive ›
2016BMW 435i Gran Coupe435i Gran CoupeView 2016 435i Gran Coupe ›
2016BMW 435i Gran Coupe xDrive435i Gran Coupe xDriveView 2016 435i Gran Coupe xDrive ›
2017BMW 430i2D ConvertibleView 2017 430i ›
2017BMW 340i xDriveStandard TransView 2017 340i xDrive ›
2017BMW 340i xDriveAutomatic TransView 2017 340i xDrive ›
2017BMW 340iStandard TransView 2017 340i ›
2017BMW 430i xDrive2D CoupeView 2017 430i xDrive ›
2017BMW 430i2D Coupe, Automatic TransView 2017 430i ›
2017BMW 340iAutomatic TransView 2017 340i ›
2017BMW 430i2D Coupe, Standard TransView 2017 430i ›