What is the diameter of a 305/30R20 tire?

A 305/30R20 tire has an overall diameter of 27.2 inches (690.9mm).

How many revolutions per mile does a 305/30R20 tire make?

A 305/30R20 tire makes approximately 741 revolutions per mile.

What rim width is recommended for 305/30R20 tires?

The recommended wheel rim width for a 305/30R20 tire is 7.6" - 10.7".

305/30R20

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 305/30R20 tire size features an overall diameter of 27.2 inches, a section width of 12.0 inches (305mm), and rotates 741 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Acura NSX.

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Physical Dimensions & Specs

Overall Diameter

27.2"

690.9 mm

Section Width

305 mm

12.01" wide

Sidewall Height

3.6"

91.4 mm (30% aspect)

Revolutions / Mile

741

Circumference: 85.47"

Rim Diameter

20"

Wheel size

Recommended Rim Width

7.6" - 10.7"

Optimal rim width range

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Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 305/30R20 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)305/30R20

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:27.2"

Sidewall:3.6"

Revs/Mile:741

Tire 2 (New / Compare)245/60R18

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:29.6"

Sidewall:5.8"

Revs/Mile:682

Visual Tire & Wheel Comparison

Speedometer Variance

+8.7%At 60 mph reading, actual speed is 65.2 mph

Indicated	Actual Speed	Diff
20 mph	21.7 mph	+1.7 mph
30 mph	32.6 mph	+2.6 mph
45 mph	48.9 mph	+3.9 mph
60 mph	65.2 mph	+5.2 mph
75 mph	81.5 mph	+6.5 mph
90 mph	97.8 mph	+7.8 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:+1.19" ground clearance

Vehicles That Fit 305/30R20 (150+ Models)

Factory standard and optional vehicle fitments utilizing 305/30R20 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2017	Acura NSX	NSX	View 2017 NSX ›
2018	Acura NSX	NSX	View 2018 NSX ›
2019	Acura NSX	NSX	View 2019 NSX ›
2020	Acura NSX	NSX	View 2020 NSX ›
2021	Acura NSX	NSX	View 2021 NSX ›
2022	Acura NSX	NSX	View 2022 NSX ›
2020	Audi R8	Performance, 2D Convertible	View 2020 R8 ›
2020	Audi R8	Performance, 2D Coupe	View 2020 R8 ›
2021	Audi R8	Base, 2D Convertible, 5.2L Eng VIN A	View 2021 R8 ›
2021	Audi R8	Base, 2D Coupe, 5.2L Eng VIN E	View 2021 R8 ›
2021	Audi R8	Base, 2D Convertible, 5.2L Eng VIN E	View 2021 R8 ›
2021	Audi R8	Base, 2D Coupe, 5.2L Eng VIN A	View 2021 R8 ›
2021	Audi R8	Performance, 2D Convertible	View 2021 R8 ›
2021	Audi R8	Performance, 2D Coupe	View 2021 R8 ›
2022	Audi R8	2D Convertible, 5.2L Eng VIN B	View 2022 R8 ›
2022	Audi R8	2D Convertible, 5.2L Eng VIN E	View 2022 R8 ›
2022	Audi R8	2D Coupe, 5.2L Eng VIN B	View 2022 R8 ›
2022	Audi R8	2D Coupe, 5.2L Eng VIN E	View 2022 R8 ›
2023	Audi R8	Performance, 2D Convertible, 5.2L Eng VIN B	View 2023 R8 ›
2023	Audi R8	Performance, 2D Convertible, 5.2L Eng VIN E	View 2023 R8 ›
2023	Audi R8	Performance, 2D Coupe, 5.2L Eng VIN B	View 2023 R8 ›
2023	Audi R8	Performance, 2D Coupe, 5.2L Eng VIN E	View 2023 R8 ›
2017	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2017 Camaro ›
2018	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2018 Camaro ›
2019	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2019 Camaro ›
2020	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Corvette	2D Convertible	View 2020 Corvette ›
2020	Chevrolet Corvette	2D Coupe	View 2020 Corvette ›
2021	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Corvette	2D Convertible	View 2021 Corvette ›
2021	Chevrolet Corvette	2D Coupe	View 2021 Corvette ›
2022	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Corvette	2D Convertible	View 2022 Corvette ›
2022	Chevrolet Corvette	2D Coupe	View 2022 Corvette ›
2023	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2023 Camaro ›
2024	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2024 Camaro ›
2024	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2024 Camaro ›
2024	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2024 Camaro ›
2024	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2024 Camaro ›
2024	Chevrolet Camaro	ZL1, 2D Convertible, Automatic Trans	View 2024 Camaro ›
2024	Chevrolet Camaro	ZL1, 2D Convertible, Standard Trans	View 2024 Camaro ›
2024	Chevrolet Camaro	ZL1, 2D Coupe, Standard Trans	View 2024 Camaro ›
2024	Chevrolet Camaro	ZL1, 2D Coupe, Automatic Trans	View 2024 Camaro ›
2024	Chevrolet Corvette	Stingray, 2D Convertible	View 2024 Corvette ›
2024	Chevrolet Corvette	Stingray, 2D Coupe	View 2024 Corvette ›
2025	Chevrolet Corvette	Stingray, 2D Convertible	View 2025 Corvette ›
2025	Chevrolet Corvette	Stingray, 2D Coupe	View 2025 Corvette ›
2020	Ford Mustang	Shelby GT500	View 2020 Mustang ›
2021	Ford Mustang	Shelby GT500	View 2021 Mustang ›
2022	Ford Mustang	Shelby GT500	View 2022 Mustang ›
2014	Jaguar XKR-S	GT, 2D Convertible	View 2014 XKR-S ›
2014	Jaguar XKR-S	GT, 2D Coupe	View 2014 XKR-S ›
2017	Jaguar F-Type	SVR, 2D Convertible	View 2017 F-Type ›
2017	Jaguar F-Type	SVR, 2D Coupe	View 2017 F-Type ›
2018	Jaguar F-Type	SVR, 2D Convertible	View 2018 F-Type ›
2018	Jaguar F-Type	SVR, 2D Coupe	View 2018 F-Type ›
2019	Jaguar F-Type	SVR, 2D Convertible	View 2019 F-Type ›
2019	Jaguar F-Type	SVR, 2D Coupe	View 2019 F-Type ›
2019	Jaguar XE	SV Project 8	View 2019 XE ›
2020	Jaguar F-Type	SVR, 2D Convertible	View 2020 F-Type ›
2020	Jaguar F-Type	SVR, 2D Coupe	View 2020 F-Type ›
2021	Jaguar F-Type	R, 2D Convertible	View 2021 F-Type ›
2021	Jaguar F-Type	R, 2D Coupe	View 2021 F-Type ›
2022	Jaguar F-Type	R, 2D Coupe	View 2022 F-Type ›
2022	Jaguar F-Type	R, 2D Convertible	View 2022 F-Type ›
2023	Jaguar F-Type	R, 2D Convertible	View 2023 F-Type ›
2023	Jaguar F-Type	R, 2D Coupe	View 2023 F-Type ›
2012	Lexus LFA	LFA	View 2012 LFA ›
2018	Mercedes-Benz GT C AMG	2D Convertible	View 2018 GT C AMG ›
2018	Mercedes-Benz GT C AMG	2D Coupe	View 2018 GT C AMG ›
2019	Mercedes-Benz GT C AMG	2D Convertible	View 2019 GT C AMG ›
2019	Mercedes-Benz GT C AMG	2D Coupe	View 2019 GT C AMG ›
2020	Mercedes-Benz GT C AMG	2D Convertible	View 2020 GT C AMG ›
2020	Mercedes-Benz GT C AMG	2D Coupe	View 2020 GT C AMG ›
2021	Mercedes-Benz GT C AMG	2D Convertible	View 2021 GT C AMG ›
2021	Mercedes-Benz GT C AMG	2D Coupe	View 2021 GT C AMG ›
2013	Porsche 911	Carrera 4S, 2D Convertible, Automatic DCT Trans	View 2013 911 ›
2013	Porsche 911	Carrera 4S, 2D Coupe, Automatic DCT Trans	View 2013 911 ›
2013	Porsche 911	Carrera 4S, 2D Convertible, Standard Trans	View 2013 911 ›
2013	Porsche 911	Carrera 4S, 2D Coupe, Standard Trans	View 2013 911 ›
2014	Porsche 911	Carrera 4S, 2D Coupe, Standard Trans	View 2014 911 ›
2014	Porsche 911	Carrera 4S, 2D Coupe, Automatic DCT Trans	View 2014 911 ›
2014	Porsche 911	Carrera 4S, 2D Convertible, Standard Trans	View 2014 911 ›
2014	Porsche 911	Carrera 4S, 2D Convertible, Automatic DCT Trans	View 2014 911 ›
2014	Porsche 911	GT3	View 2014 911 ›
2014	Porsche 911	Turbo S, 2D Convertible	View 2014 911 ›
2014	Porsche 911	Targa 4S, Standard Trans	View 2014 911 ›
2014	Porsche 911	Targa 4S, Automatic DCT Trans	View 2014 911 ›
2014	Porsche 911	Turbo S, 2D Coupe	View 2014 911 ›
2014	Porsche 911	Turbo, 2D Convertible	View 2014 911 ›
2014	Porsche 911	Turbo, 2D Coupe	View 2014 911 ›
2015	Porsche 911	Carrera 4S, 2D Convertible, Standard Trans	View 2015 911 ›
2015	Porsche 911	Carrera 4S, 2D Convertible, Automatic DCT Trans	View 2015 911 ›
2015	Porsche 911	Carrera 4GTS, 2D Convertible, Standard Trans	View 2015 911 ›
2015	Porsche 911	Carrera 4GTS, 2D Coupe, Automatic DCT Trans	View 2015 911 ›
2015	Porsche 911	Carrera GTS, 2D Coupe, Standard Trans	View 2015 911 ›
2015	Porsche 911	Carrera GTS, 2D Convertible, Automatic DCT Trans	View 2015 911 ›
2015	Porsche 911	Carrera 4GTS, 2D Convertible, Automatic DCT Trans	View 2015 911 ›
2015	Porsche 911	Carrera GTS, 2D Convertible, Standard Trans	View 2015 911 ›
2015	Porsche 911	Carrera GTS, 2D Coupe, Automatic DCT Trans	View 2015 911 ›
2015	Porsche 911	Carrera 4S, 2D Coupe, Standard Trans	View 2015 911 ›