# Question: How do you decode a tire size?

Contents

The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tires width. The bigger the aspect ratio, the bigger the tires sidewall will be.

## What does the 235 mean on a tire?

The number 235 is the cross-section width in millimeters, while 70 is the ratio of sidewall height to cross-section width (70 percent). R means radial-ply construction and 16 is the wheel diameter, in inches.

## What do the letters mean on tires?

The number is the load rating, or the amount of weight that it can handle. The letter is the speed rating, or the maximum speed the tire is built for. As an example, a tire rated 90R could safely carry 1,323 pounds and travel at 106 mph.

## What does the C mean at the end of a tire size?

C — A less common but still relevant letter youll see at the start of some tire sizes is a C, which means that the tire has been made for commercial vehicles, such as vans and delivery trucks that are capable of carrying heavier loads.

## Are 65 tires wider than 70?

The main thing is that the 70 is a little taller than the 65, width is the same.

## What tire is wider 60 or 70?

Generally speaking, a 215-60 series tire is wider and has a shorter sidewall then a 215-70 series tire would be and a 215-75 series tire would be taller and narrower then either the 70 series or the 60 series. The 215 designation would be the amount of weight the tire can carry at a given tire pressure.

## What is the height of a 225 tire?

The sidewall height can be calculated by multiplying the ratio (70 or 0.70) by the width (225): 225 millimeters x 0.70 = 157.5 millimeters.

## Can I use 225 65r17 instead of 225 60r17?

Registered. Yes, the heavier 65s will be more weight per corner and therefore will reduce gas mileage and acceleration slightly, and the speedo will be slightly off. The main advantages are a cushier, softer, smoother ride with more “suspension”/air cushion in the tire sidewall height.