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255/45R20

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 255/45R20 tire size features an overall diameter of 29.04 inches, a section width of 10.0 inches (255mm), and rotates 695 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Acura RDX.

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Physical Dimensions & Specs

Overall Diameter

29.04"

737.6 mm

Section Width

255 mm

10.04" wide

Sidewall Height

4.52"

114.8 mm (45% aspect)

Revolutions / Mile

695

Circumference: 91.22"

Rim Diameter

20"

Wheel size

Recommended Rim Width

6.4" - 8.9"

Optimal rim width range

Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 255/45R20 against any proposed tire size below:

Popular Comparisons:
Tire 1 (Stock / Base)255/45R20
Overall Height:29.0"
Sidewall:4.5"
Revs/Mile:695
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682

Visual Tire & Wheel Comparison

Tire 129.0" HeightTire 229.6" Height

Speedometer Variance

+1.9%At 60 mph reading, actual speed is 61.1 mph
IndicatedActual SpeedDiff
20 mph20.4 mph+0.4 mph
30 mph30.6 mph+0.6 mph
45 mph45.8 mph+0.8 mph
60 mph61.1 mph+1.1 mph
75 mph76.4 mph+1.4 mph
90 mph91.7 mph+1.7 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:+0.27" ground clearance

Vehicles That Fit 255/45R20 (150+ Models)

Factory standard and optional vehicle fitments utilizing 255/45R20 tires:

YearMake & ModelTrim / VariantLookup Specs
2019Acura RDXA-Spec, AWDView 2019 RDX ›
2019Acura RDXAdvance, AWDView 2019 RDX ›
2019Acura RDXBase, AWDView 2019 RDX ›
2019Acura RDXTechnology, AWDView 2019 RDX ›
2019Acura RDXBase, FWDView 2019 RDX ›
2020Acura RDXBaseView 2020 RDX ›
2020Acura RDXSH-AWDView 2020 RDX ›
2021Acura RDXBaseView 2021 RDX ›
2021Acura RDXSH-AWDView 2021 RDX ›
2022Acura RDXSH-AWDView 2022 RDX ›
2022Acura RDXBaseView 2022 RDX ›
2023Acura RDXSH-AWDView 2023 RDX ›
2023Acura RDXBaseView 2023 RDX ›
2024Acura RDXRDXView 2024 RDX ›
2025Acura RDXRDXView 2025 RDX ›
2018Alfa Romeo StelvioQuadrifoglioView 2018 Stelvio ›
2018Alfa Romeo StelvioTiView 2018 Stelvio ›
2019Alfa Romeo StelvioTiView 2019 Stelvio ›
2019Alfa Romeo StelvioQuadrifoglioView 2019 Stelvio ›
2020Alfa Romeo StelvioQuadrifoglioView 2020 Stelvio ›
2020Alfa Romeo StelvioTiView 2020 Stelvio ›
2021Alfa Romeo StelvioTi SportView 2021 Stelvio ›
2021Alfa Romeo StelvioQuadrifoglioView 2021 Stelvio ›
2022Alfa Romeo StelvioVeloceView 2022 Stelvio ›
2022Alfa Romeo StelvioQuadrifoglioView 2022 Stelvio ›
2023Alfa Romeo StelvioVeloceView 2023 Stelvio ›
2023Alfa Romeo StelvioQuadrifoglioView 2023 Stelvio ›
2024Alfa Romeo StelvioVeloceView 2024 Stelvio ›
2024Alfa Romeo StelvioQuadrifoglioView 2024 Stelvio ›
2025Alfa Romeo StelvioBaseView 2025 Stelvio ›
2011Audi Q53.2View 2011 Q5 ›
2012Audi Q53.2View 2012 Q5 ›
2014Audi SQ5Premium PlusView 2014 SQ5 ›
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2022Audi SQ5PremiumView 2022 SQ5 ›
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2022Audi SQ5 SportbackPrestigeView 2022 SQ5 Sportback ›
2023Audi Q4 e-tron SportbackPremiumView 2023 Q4 e-tron Sportback ›
2023Audi Q4 e-tron SportbackPremium PlusView 2023 Q4 e-tron Sportback ›
2023Audi Q4 e-tron SportbackPrestigeView 2023 Q4 e-tron Sportback ›
2023Audi Q5 ePremium PlusView 2023 Q5 e ›
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2023Audi SQ5PremiumView 2023 SQ5 ›
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2024Audi Q4 e-tronPremium Plus, AWDView 2024 Q4 e-tron ›
2024Audi Q4 e-tronPremium Plus, RWDView 2024 Q4 e-tron ›
2024Audi Q4 e-tronPremium, AWDView 2024 Q4 e-tron ›
2024Audi Q4 e-tronPremium, RWDView 2024 Q4 e-tron ›
2024Audi Q4 e-tronPrestigeView 2024 Q4 e-tron ›
2024Audi Q4 e-tron SportbackPremiumView 2024 Q4 e-tron Sportback ›
2024Audi Q4 e-tron SportbackPremium PlusView 2024 Q4 e-tron Sportback ›
2024Audi Q4 e-tron SportbackPrestigeView 2024 Q4 e-tron Sportback ›
2024Audi Q5Premium Plus, 2.0L Eng VIN AView 2024 Q5 ›
2024Audi Q5Premium Plus, 2.0L Eng VIN BView 2024 Q5 ›
2024Audi Q5Prestige, 2.0L Eng VIN AView 2024 Q5 ›
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2024Audi Q5 SportbackPremium PlusView 2024 Q5 Sportback ›
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2024Audi SQ5Premium PlusView 2024 SQ5 ›
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2024Audi SQ5 SportbackPremiumView 2024 SQ5 Sportback ›
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2025Audi Q4 e-tronPremium Plus, RWDView 2025 Q4 e-tron ›
2025Audi Q4 e-tronPremium, AWDView 2025 Q4 e-tron ›
2025Audi Q4 e-tronPremium Plus, AWDView 2025 Q4 e-tron ›
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2025Audi Q4 e-tron SportbackPrestigeView 2025 Q4 e-tron Sportback ›
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2025Audi Q4 e-tron SportbackPremiumView 2025 Q4 e-tron Sportback ›
2025Audi Q5Premium Plus, 2.0L Eng VIN BView 2025 Q5 ›
2025Audi Q4 e-tron SportbackPremium PlusView 2025 Q4 e-tron Sportback ›
2025Audi Q5Premium, 2.0L Eng VIN AView 2025 Q5 ›
2025Audi Q5Premium, 2.0L Eng VIN BView 2025 Q5 ›
2025Audi Q5Prestige, 2.0L Eng VIN AView 2025 Q5 ›
2025Audi Q5Premium Plus, 2.0L Eng VIN AView 2025 Q5 ›
2025Audi Q5Prestige, 2.0L Eng VIN BView 2025 Q5 ›
2025Audi Q5 SportbackPremium PlusView 2025 Q5 Sportback ›
2025Audi Q5 SportbackPrestigeView 2025 Q5 Sportback ›
2025Audi Q5 ePremium PlusView 2025 Q5 e ›
2025Audi Q5 ePrestigeView 2025 Q5 e ›
2025Audi SQ5PremiumView 2025 SQ5 ›
2025Audi SQ5Premium PlusView 2025 SQ5 ›
2025Audi SQ5PrestigeView 2025 SQ5 ›
2025Audi SQ5 SportbackPremiumView 2025 SQ5 Sportback ›
2025Audi SQ5 SportbackPremium PlusView 2025 SQ5 Sportback ›
2025Audi SQ5 SportbackPrestigeView 2025 SQ5 Sportback ›
2020BMW X3 MBaseView 2020 X3 M ›
2020BMW X4 MBaseView 2020 X4 M ›
2021BMW X3 MBaseView 2021 X3 M ›
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2023BMW 740i740iView 2023 740i ›
2023BMW 760i xDrive760i xDriveView 2023 760i xDrive ›
2023BMW i7i7View 2023 i7 ›
2024BMW X3 MBaseView 2024 X3 M ›
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2024BMW i7M70View 2024 i7 ›
2024BMW i7eDrive50View 2024 i7 ›
2024BMW i7xDrive60View 2024 i7 ›
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2025BMW 760i xDrive760i xDriveView 2025 760i xDrive ›
2025BMW X4 MX4 MView 2025 X4 M ›
2008Dodge ChallengerChallengerView 2008 Challenger ›
2024Dodge ChargerDaytona R/TView 2024 Charger ›
2025Dodge ChargerDaytona R/TView 2025 Charger ›
2010Ford FlexLimited, 3.5 C, AWDView 2010 Flex ›