1986 Bertone X-1/9 Tire Size

The original tire size for your 1986 Bertone X-1/9 is listed below. Tap on the box to view a color-coded explanation of the best Bertone X-1/9 tire size.


Simplified Size:  165-70-13

Simplified size is useful for shopping and buying tires.

The original tire size for your 1986 Bertone X-1/9 is 165/70SR13.  A color-coded explanation of the 1986 Bertone X-1/9's tire size is shown below.


This number indicates that your tire has a width of 165 millimeters.


This number means that your tire has an aspect ratio of 70%.  In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 70% of the width.  In this case, the sidewall height works out to be 115 millimeters.


This tire has a speed rating of S, which means 111 mph (180 km/h) is the maximum speed that can be sustained for 10 minutes.  A higher speed becomes dangerous.


This letter denotes how your tire was constructed.  Radial is the standard construction method for about 99% of all tires sold today.

BBias Belt

The tire size was designed to fit rims or wheels that are 13 inches in diameter.