Get Fmvss 139

A bulge or bubble on the sidewall of a tire generally indicates damaged cords caused by a severe impact. Damaged cords are often accompanied by a visible break in the inner liner. If cords have been damaged, air has infiltrated into the plies and can result in a bulge.

The June 2003 final rule established a new FMVSS No. 139 to provide upgraded requirements for tires for passenger cars and light trucks.

0:13 1:29 What are Tyre Sidewalls? - YouTube YouTube Start of suggested clip End of suggested clip Here right at the shoulders. Into the actual tread. Face. So the sidewall changes depending on theMoreHere right at the shoulders. Into the actual tread. Face. So the sidewall changes depending on the type of tyre.

The sidewall is measured in aspect ratio, and the number is a percentage of the width. If your tire reads 255/55R18, the sidewall height is . 55, or 55% of 255 (140 millimeters).

New Pneumatic Tires for Motor Vehicles with a GVWR of more than 4,536 kg (10,000 lbs.) This Standard establishes safe operational performance levels and marking requirements for tires for use on MPVs, trucks, buses and trailers.

For a safe repair, the puncture must be 1/2 inch away or more from the edge of the tire tread where the internal steel belt begins. Any puncture less than 1/2 inch from the start of the internal steel belt on the shoulder or sidewall of the tire cannot be repaired (highlighted in red).

P - The letter at the beginning of the tire size is the tire type. Depending on the type of vehicle you drive, you will need a tire that accommodates it's needs. In this example, the “P” in this tire size stands for Passenger.

0:13 1:29 What are Tyre Sidewalls? - YouTube YouTube Start of suggested clip End of suggested clip Here right at the shoulders. Into the actual tread. Face. So the sidewall changes depending on theMoreHere right at the shoulders. Into the actual tread. Face. So the sidewall changes depending on the type of tyre.