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.

235/40r19 vs 245/40r19 Table

This table highlights differences between 235 40r19 and 245 40r19 tires.

235/40R19 245/40R19 Difference
Tire Height 26.4″ Tire Height 26.72″ 0.31 inch
Tread Width 9.25″ Tread Width 9.65″ 0.39 inch
Circum. inch 82.94 Circum. inch 83.93 0.99 inch
Sidewall Height 3.7″ Sidewall Height 3.86″ 0.16 inch
Revolutions per mile 763.9 Revolutions per mile 754.89 -9.01
Speedometer Reading 20 mph Speedometer Reading 20.24 mph 0.24 mph
Radial Tire Radial Tire No Difference
Rim Size 19 inches Rim Size 19 inches No Difference

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.


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 Size Overall Diameter Difference
335/25R19 25.6″ (651 mm) -3%
245/35R19 25.8″ (655 mm) -2.4%
215/40R19 25.8″ (655 mm) -2.4%
285/30R19 25.8″ (655 mm) -2.4%
125/70R19 25.9″ (659 mm) -1.8%
295/30R19 26″ (661 mm) -1.5%
255/35R19 26″ (661 mm) -1.5%
355/25R19 26″ (661 mm) -1.5%
225/40R19 26.1″ (663 mm) -1.2%
305/30R19 26.3″ (667 mm) -0.6%
265/35R19 26.3″ (669 mm) -0.3%
315/30R19 26.5″ (673 mm) 0.3%
135/70R19 26.5″ (673 mm) 0.3%
275/35R19 26.6″ (675 mm) 0.6%
325/30R19 26.7″ (679 mm) 1.2%
245/40R19 26.7″ (679 mm) 1.2%
285/35R19 26.9″ (683 mm) 1.8%
335/30R19 27″ (685 mm) 2.1%
225/45R19 27″ (685 mm) 2.1%
255/40R19 27″ (687 mm) 2.4%
295/35R19 27.1″ (689 mm) 2.7%
345/30R19 27.2″ (691 mm) 3%

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

Tire Size Overall Diameter Difference
295/30R19 26″ (661 mm) -2.7%
225/40R19 26.1″ (663 mm) -2.4%
305/30R19 26.3″ (667 mm) -1.8%
265/35R19 26.3″ (669 mm) -1.5%
235/40R19 26.4″ (671 mm) -1.2%
135/70R19 26.5″ (673 mm) -0.9%
315/30R19 26.5″ (673 mm) -0.9%
275/35R19 26.6″ (675 mm) -0.6%
285/35R19 26.9″ (683 mm) 0.6%
335/30R19 27″ (685 mm) 0.9%
225/45R19 27″ (685 mm) 0.9%
255/40R19 27″ (687 mm) 1.2%
295/35R19 27.1″ (689 mm) 1.5%
345/30R19 27.2″ (691 mm) 1.8%
175/60R19 27.3″ (693 mm) 2.1%
235/45R19 27.4″ (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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