Tire Size 235/40r19 vs 245/40r19

The main difference between tire sizes 235/40R19 and 245/40R19 lies in section width. While the aspect ratio and diameter are similar, the 245/40R19 is 10mm wider than the 235/40R19 tire size. This impacts various performance factors.

Tire 1 Front View
Width
Dia.
Tire 2 Front View
Width
Dia.
Tire 1 Side View
Tire 1 Wheel
circumference 1
Circ.
Rim
Wall
Revs/Mile
Tire 2 Side View
Tire 2 Wheel
Circ.
Rim
Wall
Revs/Mile
/ R
/ R
Parameter235/35 R18205/40 R18Differ.
Tire Height
Section Width
Circumference
Sidewall Height
Revolutions
Rim Size

 

Fitment Guide

The 245/40R19 is only 1.2% larger in overall diameter, well under the 3% limit for direct replacement without adaptations. Both sizes should fit the same wheels without issues.

Ground Clearance

With a 1.2% larger diameter, the 245/40R19 provides a minor 0.16-inch increase in ground clearance over the 235/40R19.

This slightly improves off-road capability and obstacle clearance, though the difference is negligible.

Gas Mileage

The 235/40R19’s more minor contact patch and lower rotational mass give it a fuel efficiency advantage.

The larger 245/40R19 creates more rolling resistance, which reduces mpg. This makes the 235/40R19 a better choice for improving fuel economy.

Ride Comfort

While the diameter is nearly identical, the 245/40R19’s additional 10mm of section width contributes to a more comfortable ride. The larger contact patch absorbs impacts and irregularities better. However, the difference is subtle.

Aesthetics

Visually, the 4.3% increase in section width of the 245/40R19 gives it a slightly more aggressive, sporty look compared to the 235/40R19. The wider stance suits some vehicle styles better aesthetically.

Handling & Stability

The 235/40R19’s smaller contact patch provides sharper handling and quicker steering response. The 245/40R19 trades some precision for enhanced stability at higher speeds and over uneven surfaces. Both deliver stable, responsive performance.

Noise & Vibration

The 235/40R19 transmits more road noise and vibration due to its narrower tread and stiffer sidewalls. The 245/40R19 runs quieter and smoother thanks to its wider footprint and impact absorption.

Durability & Wear

The 235/40R19 should exhibit slightly more even treadwear and a marginally longer lifespan before needing replacement. The wider 245/40R19 stresses components, potentially accelerating wear.

Adverse Conditions

Performance in rain, snow, and off-road is comparable. The 245/40R19’s larger contact patch gives it a traction advantage, while the narrower 235/40R19 can cut through snow more effectively.

Speedometer Difference

When a vehicle travels at a speed of 20 mph, the speedometer reads 20 mph with 235/40r19 tires equipped. However, with 245/40r19 tires at the same real-world 20 mph speed, the speedometer reading is slightly higher at 20.24 mph.

This 0.24 mph difference occurs because the 245/40r19 tires have a larger diameter and cover more ground per revolution. The speedometer will read marginally high with 245/40r19 tires compared to 235/40r19 at the same actual vehicle speed.

Alternative For 235/40R19
The table shows various tire sizes, their corresponding overall diameter, and the percentage difference between them.

Tire SizeOverall DiameterDifference
335/25R1925.6″ (651 mm)-3%
245/35R1925.8″ (655 mm)-2.4%
215/40R1925.8″ (655 mm)-2.4%
285/30R1925.8″ (655 mm)-2.4%
125/70R1925.9″ (659 mm)-1.8%
295/30R1926″ (661 mm)-1.5%
255/35R1926″ (661 mm)-1.5%
355/25R1926″ (661 mm)-1.5%
225/40R1926.1″ (663 mm)-1.2%
305/30R1926.3″ (667 mm)-0.6%
265/35R1926.3″ (669 mm)-0.3%
315/30R1926.5″ (673 mm)0.3%
135/70R1926.5″ (673 mm)0.3%
275/35R1926.6″ (675 mm)0.6%
325/30R1926.7″ (679 mm)1.2%
245/40R1926.7″ (679 mm)1.2%
285/35R1926.9″ (683 mm)1.8%
335/30R1927″ (685 mm)2.1%
225/45R1927″ (685 mm)2.1%
255/40R1927″ (687 mm)2.4%
295/35R1927.1″ (689 mm)2.7%
345/30R1927.2″ (691 mm)3%

235/40r19 vs 245/40r19

Alternative For 245/40R19
By examining the differences in diameter, you can determine which tire size will best suit your vehicle’s needs.

Tire SizeOverall DiameterDifference
295/30R1926″ (661 mm)-2.7%
225/40R1926.1″ (663 mm)-2.4%
305/30R1926.3″ (667 mm)-1.8%
265/35R1926.3″ (669 mm)-1.5%
235/40R1926.4″ (671 mm)-1.2%
135/70R1926.5″ (673 mm)-0.9%
315/30R1926.5″ (673 mm)-0.9%
275/35R1926.6″ (675 mm)-0.6%
285/35R1926.9″ (683 mm)0.6%
335/30R1927″ (685 mm)0.9%
225/45R1927″ (685 mm)0.9%
255/40R1927″ (687 mm)1.2%
295/35R1927.1″ (689 mm)1.5%
345/30R1927.2″ (691 mm)1.8%
175/60R1927.3″ (693 mm)2.1%
235/45R1927.4″ (695 mm)2.4%

Our Observation
Based on the nuanced differences between these two tire sizes, the 235/40R19 is the better overall choice for most drivers. Its advantages in fuel economy, handling precision, and tread life make it a smart option for daily commuting and performance driving.

While the 245/40R19 offers a smoother ride and improved aesthetics, the 235/40R19’s crisper steering response and lower rolling resistance are more practical for everyday use.

For these reasons, I recommend the 235/40R19 as the ideal tire size for a balanced driving experience. The slightly smaller contact patch delivers an optimal blend of efficiency, grip, and longevity that suits a wide range of vehicles and driving styles.

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