Tire Size 255/45r18 in inches

The tire size 255/45R18 is equivalent to 27x10R18 in inches, has a diameter of 27 inches (686.7mm), a section width of 10 inches (255mm), a wheel diameter of 18 inches (457mm), and is approved to be mounted on 8.0-9.5 inches (203.2-241.3mm) wide wheels.

This particular tire size provides an excellent balance between performance and comfort, catering to a range of vehicles and applications.

255/45r18 in inches

Use this Table chart to grasp intricate measurements in inches and millimeters all at once.

FeatureInchesMetric (mm)
Tire Diameter27686.7
Section Width10255
Rim Height18457
Sidewall Height4.5114.8
Circumference84.92157.3
Revolutions464 per km747 per mile
Rim Width Range8.0-9.5203.2 – 241.3

How Tall Is A 255/45R18 Tire?

The Tire Height of the 255/45R18 tire size is 27 inches or approximately 686.7 millimeters. This measure is also known as the overall diameter and represents the total height of the tire when it’s fully mounted and inflated. This measurement significantly impacts the driving experience, affecting aspects like ground clearance and how well a vehicle maneuvers over bumps or other road irregularities.

What Is the 255/45R18 Width In Inches?

The tread width of the 255/45R18 tire size is 10 inches or about 255 millimeters. The tread width represents the contact surface of the tire with the road. A larger tread width can offer improved grip and stability, especially in high-performance scenarios. In contrast, a narrower tread width could provide more fuel consumption and tire wear efficiency.

What Is the 255/45R18 Sidewall Height?

The 255/45R18 tire’s sidewall height is 4.5 inches, which translates to roughly 114.8 millimeters. The sidewall height is the measure from the rim seat to the outside of the tire tread. It plays a pivotal role in ride comfort and overall handling, with a taller sidewall providing a softer, more comfortable ride while a shorter sidewall delivers better handling and cornering.

What Is the 255/45R18 Tire Circumference?

The circumference of the 255/45R18 tire size is approximately 84.9 inches or 2157.3 millimeters. The circumference determines the distance a vehicle will travel with one complete wheel revolution. A larger circumference could increase top speed but reduce acceleration, whereas a smaller circumference might decrease top speed but enhance acceleration.

What Is the 255/45R18 Revolutions Per Mile?

For the 255/45R18 tire size, there are approximately 747 revolutions per mile or about 464 revolutions per kilometer. This figure is inversely related to the tire’s circumference and is crucial in calculating speed, fuel efficiency, and the functioning of vehicle systems like the speedometer and odometer.

What Is the 255/45R18 Rims Size?

The 255/45R18 tire size, the rim diameter is 18 inches or 457 millimeters. Matching the tire size with the appropriate rim size is critical to ensure optimal performance and safety. This tire size can be mounted on rims with widths ranging from 8.0 to 9.5 inches (203.2-241.3mm).

Fitment Guide
This table will guide you on which vehicle makes, and models are compatible with the 255/45R18 tire size. Always refer to the owner’s manual or consult a tire professional for accurate information.

Brand NameModel
ASTON MARTINV8 Zagato (1986 – 1989)
AUDIA7 (2010 – 2018), A8 (2002 – 2010), Q3 (2011 – 2014), S8 (1999 – 2003)
BMW3 Series (2013 – 2019), 4 Series (2021 – 2023), 7 Series (1994 – 2001), i4 (2021 – 2023), X3 (2003 – 2010)
CADILLACDTS (2006 – 2011), Seville (1998 – 2004), STS (2004 – 2012), STS-V (2005 – 2009), XLR (2004 – 2009)
CITROËNC5 (2016 – 2017), C6 (2005 – 2023)
DAEWOOStatesman (2003 – 2006)
FORDMustang (2005 – 2009), Mustang Shelby GT500 (2007 – 2012)
HYUNDAITucson (2004 – 2010)
JAGUARXF (2007 – 2011), XJ (2003 – 2009), XK (1998 – 2002)
MERCEDES-BENZCL-Class (1996 – 2014), CL-Class AMG (1994 – 1999), S-Class (1991 – 2013), S-Class AMG (2006 – 2013), SL-Class (2003 – 2020)
OPELInsignia Country Tourer (2017 – 2019)
PONTIACGrand Prix (2004 – 2008), Grand Prix GXP (2005 – 2008)
TOYOTATacoma (2005 – 2013)
VAUXHALLInsignia Country Tourer (2017 – 2019)
VOLKSWAGENCalifornia (2003 – 2023), Caravelle (2003 – 2023), Multivan (2003 – 2023), Phaeton (2002 – 2016), Transporter (2003 – 2023)
VOLVOXC70 (2001 – 2007)

Replacement Tire Size
Replacement tires have to be within 3% of the total diameter of the original tires to ensure they match. A significant difference can affect the vehicle’s handling characteristics and may cause discrepancies in the speedometer readings.

Tire SizeOverall DiameterDifference
265/40R1826.3″-2.60%
235/45R1826.3″-2.60%
305/35R1826.4″-2.30%
215/50R1826.5″-2.00%
135/80R1826.5″-2.00%
155/70R1826.6″-1.70%
315/35R1826.7″-1.50%
275/40R1826.7″-1.50%
245/45R1826.7″-1.50%
225/50R1826.9″-0.60%
205/55R1826.9″-0.60%
285/40R1827.0″-0.30%
325/35R1827.0″-0.30%
165/70R1827.1″0.30%
145/80R1827.1″0.30%
295/40R1827.3″0.90%
215/55R1827.3″0.90%
235/50R1827.3″0.90%
265/45R1827.4″1.20%
345/35R1827.5″1.70%
305/40R1827.6″2.00%
145/85R1827.7″2.30%
245/50R1827.7″2.30%
205/60R1827.7″2.30%
225/55R1827.8″2.60%
275/45R1827.8″3.00%
155/80R1827.8″2.60%

Our Observation
In our observation, the 255/45R18 tire size is a versatile option. With its balanced dimensions, it provides a comfortable ride while delivering a commendable level of performance. It suits various vehicle types, including sedans, crossovers, and sports utility vehicles.

However, it’s always crucial to consider vehicle specifications, driving conditions, and personal preferences before making a tire selection.

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