What is the diameter of a 245/40R20 tire?

A 245/40R20 tire has an overall diameter of 27.72 inches (704.1mm).

How many revolutions per mile does a 245/40R20 tire make?

A 245/40R20 tire makes approximately 728 revolutions per mile.

What rim width is recommended for 245/40R20 tires?

The recommended wheel rim width for a 245/40R20 tire is 6.1" - 8.6".

245/40R20

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 245/40R20 tire size features an overall diameter of 27.72 inches, a section width of 9.6 inches (245mm), and rotates 728 times per mile. It is a standard factory tire fitment on 150+ vehicle models including BMW 760i, BMW 750i, BMW 750Li.

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Physical Dimensions & Specs

Overall Diameter

27.72"

704.1 mm

Section Width

245 mm

9.65" wide

Sidewall Height

3.86"

98.0 mm (40% aspect)

Revolutions / Mile

728

Circumference: 87.07"

Rim Diameter

20"

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 245/40R20 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)245/40R20

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:27.7"

Sidewall:3.9"

Revs/Mile:728

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

+6.7%At 60 mph reading, actual speed is 64.0 mph

Indicated	Actual Speed	Diff
20 mph	21.3 mph	+1.3 mph
30 mph	32.0 mph	+2.0 mph
45 mph	48.0 mph	+3.0 mph
60 mph	64.0 mph	+4.0 mph
75 mph	80.0 mph	+5.0 mph
90 mph	96.0 mph	+6.0 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:+0.93" ground clearance

Vehicles That Fit 245/40R20 (150+ Models)

Factory standard and optional vehicle fitments utilizing 245/40R20 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2006	BMW 760i	760i	View 2006 760i ›
2007	BMW 750i	750i	View 2007 750i ›
2007	BMW 750Li	750Li	View 2007 750Li ›
2008	BMW 750Li	750Li	View 2008 750Li ›
2008	BMW 750i	750i	View 2008 750i ›
2010	BMW 550i GT	4.4 C	View 2010 550i GT ›
2010	BMW 550i GT	4.4, N63	View 2010 550i GT ›
2010	BMW 550i GT	4.4, N63B44A	View 2010 550i GT ›
2014	BMW i8	i8	View 2014 i8 ›
2015	BMW i8	i8	View 2015 i8 ›
2016	BMW i8	i8	View 2016 i8 ›
2017	BMW M760i xDrive	M760i xDrive	View 2017 M760i xDrive ›
2017	BMW i8	i8	View 2017 i8 ›
2018	BMW M760i xDrive	M760i xDrive	View 2018 M760i xDrive ›
2019	BMW i8	2D Convertible	View 2019 i8 ›
2019	BMW i8	2D Coupe	View 2019 i8 ›
2019	BMW M760i xDrive	M760i xDrive	View 2019 M760i xDrive ›
2020	BMW i8	2D Convertible	View 2020 i8 ›
2020	BMW i8	2D Coupe	View 2020 i8 ›
2020	BMW M760i xDrive	M760i xDrive	View 2020 M760i xDrive ›
2022	BMW Alpina B8 Gran Coupe xDrive	Alpina B8 Gran Coupe xDrive	View 2022 Alpina B8 Gran Coupe xDrive ›
2023	BMW Alpina B8 Gran Coupe xDrive	Alpina B8 Gran Coupe xDrive	View 2023 Alpina B8 Gran Coupe xDrive ›
2024	BMW X2	M35i	View 2024 X2 ›
2024	BMW Alpina B8 Gran Coupe xDrive	Alpina B8 Gran Coupe xDrive	View 2024 Alpina B8 Gran Coupe xDrive ›
2025	BMW X2	M35i	View 2025 X2 ›
2014	Cadillac ELR	ELR	View 2014 ELR ›
2016	Cadillac CT6	Platinum, 3.0L Eng VIN 6	View 2016 CT6 ›
2016	Cadillac CT6	Platinum, 3.6L Eng VIN S	View 2016 CT6 ›
2016	Cadillac ELR	ELR	View 2016 ELR ›
2017	Cadillac CT6	Platinum, 3.6L Eng VIN S	View 2017 CT6 ›
2017	Cadillac CT6	Platinum, 3.0L Eng VIN 6	View 2017 CT6 ›
2018	Cadillac CT6	Platinum, 3.0L Eng VIN 6	View 2018 CT6 ›
2018	Cadillac CT6	Platinum, 3.6L Eng VIN S	View 2018 CT6 ›
2019	Cadillac CT6	Platinum, 4.2L Eng VIN J	View 2019 CT6 ›
2019	Cadillac CT6	Platinum, 3.0L Eng VIN 6	View 2019 CT6 ›
2019	Cadillac CT6	V	View 2019 CT6 ›
2020	Cadillac CT6	V	View 2020 CT6 ›
2020	Cadillac CT6	Platinum	View 2020 CT6 ›
2016	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2016 Camaro ›
2016	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2016 Camaro ›
2017	Chevrolet Camaro	LS, 2D Convertible, 2.0L Eng VIN X	View 2017 Camaro ›
2017	Chevrolet Camaro	LS, 2D Convertible, 3.6L Eng VIN S	View 2017 Camaro ›
2017	Chevrolet Camaro	LS, 2D Coupe, 3.6L Eng VIN S	View 2017 Camaro ›
2017	Chevrolet Camaro	LS, 2D Coupe, 2.0L Eng VIN X	View 2017 Camaro ›
2017	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Standard 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	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans	View 2017 Camaro ›
2017	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2017 Camaro ›
2018	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LS, 2D Coupe, 3.6L Eng VIN S	View 2018 Camaro ›
2018	Chevrolet Camaro	LS, 2D Convertible, 2.0L Eng VIN X	View 2018 Camaro ›
2018	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LS, 2D Convertible, 3.6L Eng VIN S	View 2018 Camaro ›
2018	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2018 Camaro ›
2018	Chevrolet Camaro	LS, 2D Coupe, 2.0L Eng VIN X	View 2018 Camaro ›
2019	Chevrolet Camaro	LS, 2.0L Eng VIN X, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LS, 3.6L Eng VIN S, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LS, 2.0L Eng VIN X, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LS, 3.6L Eng VIN S, Automatic Trans	View 2019 Camaro ›
2019	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans	View 2019 Camaro ›
2020	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT1, 2D Coupe, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT1, 2D Convertible, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT1, 2D Convertible, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT1, 2D Coupe, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	SS, 2D Convertible, Standard Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2020 Camaro ›
2020	Chevrolet Camaro	SS, 2D Coupe, Standard Trans	View 2020 Camaro ›
2021	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT1, 2D Convertible, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT1, 2D Convertible, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT1, 2D Coupe, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	SS, 2D Coupe, Automatic Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, 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	LT1, 2D Coupe, Standard Trans	View 2021 Camaro ›
2021	Chevrolet Camaro	SS, 2D Convertible, Automatic Trans	View 2021 Camaro ›
2022	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT1, 2D Convertible, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT1, 2D Coupe, Automatic Trans	View 2022 Camaro ›
2022	Chevrolet Camaro	LT1, 2D Coupe, Standard Trans	View 2022 Camaro ›
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	LT1, 2D Convertible, Standard Trans	View 2022 Camaro ›
2023	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans	View 2023 Camaro ›
2023	Chevrolet Camaro	LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans	View 2023 Camaro ›