What is the diameter of a 265/40R18 tire?

A 265/40R18 tire has an overall diameter of 26.35 inches (669.3mm).

How many revolutions per mile does a 265/40R18 tire make?

A 265/40R18 tire makes approximately 765 revolutions per mile.

What rim width is recommended for 265/40R18 tires?

The recommended wheel rim width for a 265/40R18 tire is 6.6" - 9.3".

265/40R18

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 265/40R18 tire size features an overall diameter of 26.35 inches, a section width of 10.4 inches (265mm), and rotates 765 times per mile. It is a standard factory tire fitment on 131+ vehicle models including BMW M3.

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Physical Dimensions & Specs

Overall Diameter

26.35"

669.3 mm

Section Width

265 mm

10.43" wide

Sidewall Height

4.17"

105.9 mm (40% aspect)

Revolutions / Mile

765

Circumference: 82.77"

Rim Diameter

18"

Wheel size

Recommended Rim Width

6.6" - 9.3"

Optimal rim width range

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Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 265/40R18 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)265/40R18

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:26.3"

Sidewall:4.2"

Revs/Mile:765

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

+12.3%At 60 mph reading, actual speed is 67.4 mph

Indicated	Actual Speed	Diff
20 mph	22.5 mph	+2.5 mph
30 mph	33.7 mph	+3.7 mph
45 mph	50.5 mph	+5.5 mph
60 mph	67.4 mph	+7.4 mph
75 mph	84.2 mph	+9.2 mph
90 mph	101.0 mph	+11.0 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:+1.61" ground clearance

Vehicles That Fit 265/40R18 (131+ Models)

Factory standard and optional vehicle fitments utilizing 265/40R18 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2008	BMW M3	2D Convertible	View 2008 M3 ›
2008	BMW M3	4D Sedan	View 2008 M3 ›
2008	BMW M3	2D Coupe	View 2008 M3 ›
2009	BMW M3	2D Convertible, Automatic DCT	View 2009 M3 ›
2009	BMW M3	2D Convertible, Standard	View 2009 M3 ›
2009	BMW M3	2D Coupe, Standard	View 2009 M3 ›
2009	BMW M3	4D Sedan, Standard	View 2009 M3 ›
2009	BMW M3	4D Sedan, Automatic DCT	View 2009 M3 ›
2009	BMW M3	2D Coupe, Automatic DCT	View 2009 M3 ›
2010	BMW M3	2D Convertible, Automatic DCT	View 2010 M3 ›
2010	BMW M3	2D Convertible, Standard	View 2010 M3 ›
2010	BMW M3	2D Coupe, Automatic DCT	View 2010 M3 ›
2010	BMW M3	2D Coupe, Standard	View 2010 M3 ›
2010	BMW M3	4D Sedan, Automatic DCT	View 2010 M3 ›
2010	BMW M3	4D Sedan, Standard	View 2010 M3 ›
2011	BMW M3	2D Convertible, Automatic DCT	View 2011 M3 ›
2011	BMW M3	2D Convertible, Standard	View 2011 M3 ›
2011	BMW M3	2D Coupe, Automatic DCT	View 2011 M3 ›
2011	BMW M3	2D Coupe, Standard	View 2011 M3 ›
2011	BMW M3	4D Sedan, Standard	View 2011 M3 ›
2011	BMW M3	4D Sedan, Automatic DCT	View 2011 M3 ›
2012	BMW M3	2D Convertible, Automatic DCT Trans	View 2012 M3 ›
2012	BMW M3	2D Convertible, Standard Trans	View 2012 M3 ›
2012	BMW M3	2D Coupe, Automatic DCT Trans	View 2012 M3 ›
2012	BMW M3	2D Coupe, Standard Trans	View 2012 M3 ›
2013	BMW M3	2D Convertible, Automatic DCT Trans	View 2013 M3 ›
2013	BMW M3	2D Convertible, Standard Trans	View 2013 M3 ›
2013	BMW M3	2D Coupe, Automatic DCT Trans	View 2013 M3 ›
2013	BMW M3	2D Coupe, Standard Trans	View 2013 M3 ›
2003	Mercedes-Benz S430	Base	View 2003 S430 ›
2003	Mercedes-Benz S500	Base	View 2003 S500 ›
2003	Mercedes-Benz S500	4Matic	View 2003 S500 ›
2003	Mercedes-Benz S430	4Matic	View 2003 S430 ›
2003	Mercedes-Benz CL500	CL500	View 2003 CL500 ›
2003	Mercedes-Benz CL55	CL55	View 2003 CL55 ›
2003	Mercedes-Benz CL600	CL600	View 2003 CL600 ›
2003	Mercedes-Benz S55	S55	View 2003 S55 ›
2003	Mercedes-Benz S600	S600	View 2003 S600 ›
2004	Mercedes-Benz S430	Base	View 2004 S430 ›
2004	Mercedes-Benz S500	Base	View 2004 S500 ›
2004	Mercedes-Benz CL500	CL500	View 2004 CL500 ›
2004	Mercedes-Benz CL55	CL55	View 2004 CL55 ›
2004	Mercedes-Benz CL600	CL600	View 2004 CL600 ›
2004	Mercedes-Benz S55	S55	View 2004 S55 ›
2004	Mercedes-Benz S600	S600	View 2004 S600 ›
2005	Mercedes-Benz S500	Base	View 2005 S500 ›
2005	Mercedes-Benz S430	Base	View 2005 S430 ›
2005	Mercedes-Benz CL500	CL500	View 2005 CL500 ›
2005	Mercedes-Benz CL55	CL55	View 2005 CL55 ›
2005	Mercedes-Benz CL600	CL600	View 2005 CL600 ›
2005	Mercedes-Benz S55	S55	View 2005 S55 ›
2005	Mercedes-Benz S600	S600	View 2005 S600 ›
2006	Mercedes-Benz S430	Base	View 2006 S430 ›
2006	Mercedes-Benz S500	Base	View 2006 S500 ›
2006	Mercedes-Benz CL500	CL500	View 2006 CL500 ›
2006	Mercedes-Benz CL600	CL600	View 2006 CL600 ›
2006	Mercedes-Benz S350	S350	View 2006 S350 ›
2006	Mercedes-Benz S600	S600	View 2006 S600 ›
2016	Mercedes-Benz C63 AMG	C63 AMG	View 2016 C63 AMG ›
2017	Mercedes-Benz C63 AMG	2D Convertible	View 2017 C63 AMG ›
2017	Mercedes-Benz C63 AMG	2D Coupe	View 2017 C63 AMG ›
2017	Mercedes-Benz C63 AMG	4D Sedan	View 2017 C63 AMG ›
2018	Mercedes-Benz C63 AMG	4D Sedan	View 2018 C63 AMG ›
2019	Mercedes-Benz C63 AMG	4D Sedan	View 2019 C63 AMG ›
2020	Mercedes-Benz C63 AMG	4D Sedan	View 2020 C63 AMG ›
2021	Mercedes-Benz C63 AMG	4D Sedan	View 2021 C63 AMG ›
2005	Porsche 911	Carrera, 2D Coupe, Standard	View 2005 911 ›
2005	Porsche 911	Carrera, 2D Convertible, Automatic	View 2005 911 ›
2005	Porsche 911	Carrera, 2D Convertible, Standard	View 2005 911 ›
2005	Porsche 911	Carrera, 2D Coupe, Automatic	View 2005 911 ›
2005	Porsche Boxster	S, Automatic	View 2005 Boxster ›
2005	Porsche Boxster	S, Standard	View 2005 Boxster ›
2006	Porsche 911	Carrera, 2D Coupe, Automatic	View 2006 911 ›
2006	Porsche Boxster	S, Automatic	View 2006 Boxster ›
2006	Porsche Boxster	S, Standard	View 2006 Boxster ›
2006	Porsche 911	Carrera, 2D Coupe, Standard	View 2006 911 ›
2006	Porsche 911	Carrera, 2D Convertible	View 2006 911 ›
2006	Porsche Cayman	Automatic	View 2006 Cayman ›
2006	Porsche Cayman	Standard	View 2006 Cayman ›
2007	Porsche 911	Carrera, 2D Convertible	View 2007 911 ›
2007	Porsche 911	Carrera, 2D Coupe, Standard	View 2007 911 ›
2007	Porsche 911	Carrera, 2D Coupe, Automatic	View 2007 911 ›
2007	Porsche Boxster	S, Automatic	View 2007 Boxster ›
2007	Porsche Boxster	S, Standard	View 2007 Boxster ›
2007	Porsche Cayman	S, Automatic	View 2007 Cayman ›
2007	Porsche Cayman	S, Standard	View 2007 Cayman ›
2008	Porsche 911	Carrera, 2D Convertible	View 2008 911 ›
2008	Porsche 911	Carrera, 2D Coupe, Standard	View 2008 911 ›
2008	Porsche 911	Carrera, 2D Coupe, Automatic	View 2008 911 ›
2008	Porsche Boxster	S, Automatic	View 2008 Boxster ›
2008	Porsche Boxster	Base, Automatic	View 2008 Boxster ›
2008	Porsche Boxster	S, Standard	View 2008 Boxster ›
2008	Porsche Boxster	Base, Standard	View 2008 Boxster ›
2008	Porsche Cayman	S, Standard	View 2008 Cayman ›
2008	Porsche Cayman	S, Automatic	View 2008 Cayman ›
2009	Porsche 911	Carrera, 2D Convertible, Automatic DCT	View 2009 911 ›
2009	Porsche 911	Carrera, 2D Coupe, Standard	View 2009 911 ›
2009	Porsche 911	Carrera, 2D Convertible, Standard	View 2009 911 ›
2009	Porsche 911	Carrera, 2D Coupe, Automatic DCT	View 2009 911 ›
2009	Porsche Boxster	S, Automatic DCT	View 2009 Boxster ›
2009	Porsche Boxster	S, Standard	View 2009 Boxster ›
2009	Porsche Cayman	S, Automatic DCT	View 2009 Cayman ›
2009	Porsche Cayman	S, Standard	View 2009 Cayman ›
2010	Porsche 911	Carrera, 2D Convertible, Standard	View 2010 911 ›
2010	Porsche 911	Carrera, 2D Coupe, Standard	View 2010 911 ›
2010	Porsche 911	Carrera, 2D Coupe, Automatic DCT	View 2010 911 ›
2010	Porsche Boxster	S, Automatic DCT	View 2010 Boxster ›
2010	Porsche Boxster	S, Standard	View 2010 Boxster ›
2010	Porsche 911	Carrera, 2D Convertible, Automatic DCT	View 2010 911 ›
2010	Porsche Cayman	S, Automatic DCT	View 2010 Cayman ›
2010	Porsche Cayman	S, Standard	View 2010 Cayman ›
2011	Porsche 911	Carrera, 2D Coupe, Automatic DCT	View 2011 911 ›
2011	Porsche 911	Carrera, 2D Convertible, Standard	View 2011 911 ›
2011	Porsche 911	Carrera, 2D Coupe, Standard	View 2011 911 ›
2011	Porsche 911	Carrera, 2D Convertible, Automatic DCT	View 2011 911 ›
2011	Porsche Boxster	S, Automatic DCT	View 2011 Boxster ›
2011	Porsche Boxster	S, Standard	View 2011 Boxster ›
2011	Porsche Cayman	S, Automatic DCT	View 2011 Cayman ›
2011	Porsche Cayman	S, Standard	View 2011 Cayman ›
2012	Porsche 911	Carrera, 2D Convertible, 3.4L Eng, Automatic DCT Trans	View 2012 911 ›
2012	Porsche 911	Carrera, 2D Convertible, 3.4L Eng, Standard Trans	View 2012 911 ›
2012	Porsche 911	Carrera, 2D Convertible, 3.6L Eng VIN A, Automatic DCT Trans	View 2012 911 ›
2012	Porsche 911	Carrera, 2D Convertible, 3.6L Eng VIN A, Standard Trans	View 2012 911 ›
2012	Porsche 911	Carrera, 2D Coupe, 3.4L Eng, Automatic DCT Trans	View 2012 911 ›
2012	Porsche 911	Carrera, 2D Coupe, 3.4L Eng, Standard Trans	View 2012 911 ›
2012	Porsche 911	Carrera, 2D Coupe, 3.6L Eng VIN A, Automatic DCT Trans	View 2012 911 ›
2012	Porsche 911	Carrera, 2D Coupe, 3.6L Eng VIN A, Standard Trans	View 2012 911 ›
2012	Porsche Boxster	S, Automatic DCT Trans	View 2012 Boxster ›
2012	Porsche Boxster	S, Standard Trans	View 2012 Boxster ›
2012	Porsche Cayman	S, Automatic DCT Trans	View 2012 Cayman ›
2012	Porsche Cayman	S, Standard Trans	View 2012 Cayman ›