Tire Size 225/75r15 vs 235/70r15

The main difference is the sidewall height. The 225/75R15 has a taller sidewall than the 235/70R15, which means that it will provide more ground clearance and a smoother ride. However, the 235/70R15 has a slightly larger diameter, which will give you a slightly higher top speed.

225/75r15 vs 235/70r15 Table

The table compares the features of tire sizes 225/75r15 and 235/70r15, along with the percentage difference between them.

Diameter inches28.29″27.95″0.33″
Width inches8.86″9.25″0.39″
Sidewall Height6.64″6.48″0.17″
Rim Size15″15″Same
Rim Width Range6.0-7.5″6.0-8.0″Different

Overall Diameter
The overall diameter of the 225/75r15 tire is 28.29 inches (718.5 mm), while the 235/70r15 tire has a diameter of 27.95 inches (710 mm). The difference is -0.33 inches (-8.5 mm), which is a decrease of 1.2%. A larger diameter tire provides more ground clearance, beneficial for off-road driving or navigating rough terrain.

However, it can result in a lower speedometer reading. Conversely, a smaller diameter tire reduces ground clearance, potentially causing scraping or damage on rough roads, but results in a higher speedometer reading.

Tread Width
The 225/75r15 tire has a width of 8.86 inches (225 mm), while the 235/70r15 tire is slightly wider at 9.25 inches (235 mm), a difference of 0.39 inches (10 mm) or 4.4%. A wider tire generally provides improved traction due to a larger contact patch, enhancing grip during acceleration, braking, and cornering.

However, wider tires can produce more road noise. Conversely, a narrower tire has less surface area in contact with the road, potentially reducing grip, especially in wet or slippery conditions.

The circumference of the 225/75r15 tire is 88.87 inches (2257.23 mm), while the 235/70r15 tire has a circumference of 87.82 inches (2230.53 mm), a difference of -1.05 inches (-26.7 mm) or -1.2%. An increased circumference results in lower speedometer readings, while a decreased circumference leads to higher speedometer readings.

Sidewall Height
The 225/75r15 tire has a sidewall height of 6.64 inches (168.75 mm), while the 235/70r15 tire has a sidewall height of 6.48 inches (164.5 mm), a difference of -0.17 inches (-4.25 mm) or -2.5%. A taller sidewall acts as a buffer, absorbing more bumps and road irregularities for a smoother ride.

It also enhances traction on snowy or icy roads. Conversely, a shorter sidewall may lead to a harsher ride due to less cushioning, but it can give a sportier and more aggressive look.

Revolutions Per Mile
The 225/75r15 tire makes 712.97 revolutions per mile, while the 235/70r15 tire makes 721.51 revolutions per mile, a difference of 8.54 revolutions per mile or 1.2%.

A higher RPM typically means more wear due to increased friction with the road surface, leading to a shorter lifespan. Conversely, a lower RPM means the tire covers less distance per rotation, potentially extending its lifespan due to reduced wear and tear.

Rim Size
Both the 225/75r15 and 235/70r15 tires fit on a 15″ rim. However, the 225/75r15 tire fits on a rim width range of 6.0-7.5″, while the 235/70r15 tire fits on a wider range of 6.0-8.0″. Larger rims are often associated with a more aggressive and sporty look, while smaller rims can provide a more classic or conservative appearance.

How much taller is a 235/70r15 tire than a 225/75r15?

The 235/70r15 tire has a height of 27.95 inches (710 mm), while the 225/75r15 tire is 28.29 inches (718.5 mm). Thus, the 225/75r15 tire is taller by about 0.33 inches (or 8.5 mm) compared to the 235/70r15 tire.

How much wider is a 235/70r15 tire than a 225/75r15?

In terms of width, the 235/70r15 tire measures 9.25 inches (235 mm), whereas the 225/75r15 tire measures 8.86 inches (225 mm). Therefore, the 235/70r15 tire is approximately 0.39 inches (or 10 mm) wider than the 225/75r15 tire.

Can I use 235/70r15 instead of 225/75r15?

The overall diameter of the 235/70r15 tire is 27.95 inches, while the overall diameter of the 225/75r15 tire is 28.29 inches. The difference between these two tire sizes is roughly 0.33 inches, about a 1.2% difference. This is less than the 3% threshold, suggesting that using a 235/70r15 tire might be possible instead of a 225/75r15.

Can I put a 235/70r15 on a 225/75r15?

The rim width range for the 235/70r15 tire is 6.0-8.0 inches, while the range for the 225/75r15 tire is 6.0-7.5 inches. This means both tires can fit onto a rim within the overlapping range of 6.0-7.5 inches. Therefore, it seems plausible to mount a 235/70r15 tire on a rim originally fitted with a 225/75r15 tire.

In conclusion, choosing between the 225/75r15 and 235/70r15 tire sizes depends on your specific needs and driving conditions. Each tire size has advantages and disadvantages, and it’s essential to consider factors such as ground clearance, traction, comfort, and tire lifespan when deciding. Always remember to keep the diameter within a 3% difference from the factory-recommended tires for optimal performance and safety.

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