Readers ask: How Much Thread Must Be On A School Bus Tire?

WHaT is the tread depth on a school bus tire?

Department of Transportation regulations say the tread depth for any tire on the front wheels of a bus, truck or truck tractor must be at least 4/32nds when measured at any point on a major tread groove. All other tires on the vehicle must have a tread depth of at least 2/32nds.

How much thread do I need on tires?

Tires in good condition should have a minimum of 6/32” to be useful, or 4/32” if the tire is 13-14”. The average legal minimum tread depth is 2/32”, but driving becomes unsafe with such a tread. Besides, most dealerships require at least 4/32” tread to trade-in a car without prior a tire change.

WHaT is the tread depth requirement for rear tires?

California law requires most treads to be at least 1/8th of an inch in depth for front tires, and 1/16th of an inch in depth for rear tires. Tires with unlawful worn treads are commonly referred to as “bald tires.” A violation of this law is an infraction and is punished with a traffic ticket.

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WHaT size tires are on a school bus?

Tire sizing is an area where buses have fallen behind the trend to low profile designs. The majority of new buses are still spec’d with conventional 10R22. 5 or 11R22. 5 sizes.

How much is a school bus tire?

School bus tires will cost anywhere from $2,000 to 3,000 and can last 10 or more years with proper maintenance, depending on average annual mileage driven.

WHaT depth should I replace my tires?

New tires typically come with 10/32” or 11/32” tread depths, and some truck, SUV and winter tires may have deeper tread depths than other models. The U.S. Department of Transportation recommends replacing tires when they reach 2/32”, and many states legally require tires to be replaced at this depth.

What is minimum tire tread depth that is safe?

The minimum legal limit is 2/32 of an inch. This doesn’t mean that tires are perfectly safe if they have 3/32 left of tread. This is simply the limit at which you won’t pass your state safety inspection. Your tires become incrementally less safe as the tread wears down.

Is the penny test for tires accurate?

For years, motorists have been told the “penny test” is an accurate indicator of whether or not you need new tires. The test is conducted by sticking a penny head down in a tire tread; if you see all of Lincoln’s head, then you should change the tires. The one with an eighth of an inch of tread stopped in 300 feet.

Should I replace all 4 tires?

Type of Vehicle If so, most vehicle manufacturers and the Tire Industry Association (TIA) recommend that you always replace all four tires at the same time. That’s because the reduced diameter of the lower-tread tires causes them to spin faster than the new one.

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How many miles is 1/32 of tread?

Depending on the tread compound, the tread will wear down about 1/32 inch for every 5,000 to 8,500 miles of normal driving. Consequently, a new set of tires may last 40,000 to 70,000 miles on average. As the tread wears down, the depth of the grooves between the treads becomes shallower.

What is the minimum tread depth for tires other than the front tires?

This is crucially important! You absolutely must memorize that the front tires (steer tires) need at least 4/32-inch tread depth in every major groove. All other tires (drive tires, trailer tires, etc) must have at least 2/32-inch tread depth in every major groove.

What depth of tread is the legal limit?

The legal limit for minimum depth of the tread on your tyres is 1.6 millimetres, across the central ¾ of the tread around the complete circumference of the tyre. For safety reasons, it is recommended that you replace your car tyres before the legal limit is reached.

How long do school bus tires last?

When school bus tires reach a certain age, they can begin to break down from the inside. For this reason, tire manufacturers warn that tires should be replaced after 10 years. Many safety experts say, however, that a tire should be replaced after six years, regardless of the appearance.

How many miles do bus tires last?

“A commercial tire that’s meant to be retreaded may be able to go 300,000 miles, 400,000 miles but that doesn’t mean it can go 10, 20, 30 years and continue to be retreaded and used on buses,” said Wetherington.

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WHaT is the diameter of a 11R22 5 tire?

Standard profile tires have an aspect ratio of 88 percent. The height of the tire from rim to tread will be 88 percent of the width. An 11R22. 5 tire will be approximately 11 inches wide and 9.5 inches high.

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