![]() If the tire tread is down to wear bars on the steer tires on the front, the tire needs to be replaced. What you do need to know is inside the tread are wear bars. ![]() Tires on the front of commercial vehicles have to be brand new.Īfter you pass your road test, you don't really need to know the information that is required in terms of 1.6mm on the rear, 3mm on the front, and gashes that are not longer than 2.5cm. This front tire on this truck is not safe and needs to be replaced. This tread is worn deeper than this tread.Īnd this side - so this tire has uneven wear - you can see that it's worn more on this side of the tire than it is on this side of the tire. On the top of this tire-this is a front tire-on this truck you begin to see that this tire is beginning-there's a dip here in the tread. If any of those criteria exist, the tire won't pass, will not pass an MVI you will not pass a road test, and if you show up with tires with those conditions for road test, you won't be able to take the road test. The other criteria that a tire has to have to pass a road test - it cannot have any cuts are gashes in the tire that are longer than 2.5cm or one inch, and there cannot be cuts or abrasions in the tire that expose the chord inside the tires. On the rear tires it can be 1/16 inch or 1.6mm. Now you need to know for the purposes of a road test that tread depth on the front is 3mm (1/8 inch) minimum to pass the road test or to pass and MVI (Motor Vehicle Inspection) that the tread depths. They cannot be retreads as they can on the back of the truck and on the semi-trailer - they have to be brand new. So these retreads come apart on a lot less frequent basis. The chemical technology and improvements are getting much better. I mean it still happens once in awhile but the adhesive- the vulcanizing process-that they use to adhere the retread to the casing is getting better and better. ![]() It's becoming less and less common that the retreads are flying off these tires. If you get a hunk of retread that comes off and flies on the road, it's called a gator because it takes a bite of your vehicle if you run over it. So tires on the back of trucks and semi-trailers are retreads.Ī lot of people in the industry they're called Gators. Now the other thing you need to know about tires on the back of the truck: these are 22.5s - a lot of tires are 24s - those are the two most common sizes so obviously the 24 is bigger.Ī) there is a little bit of fuel mileage benefit because the tire doesn't roll as much on a bigger tire.ī) also when you dropped trailers-semi-trailers-off the back of a big truck, it drops the trailer at a different height so it's important when you're hooking up to get out and check the trailer height.īecause if the trailer is too high, you're gonna drop the kingpin over the front of the fifth wheel.Īnd let me tell you from personal experience it's a bit of a pain in the butt to get that out of there.Īnd I'll make another video to explain to you-if you do drop the kingpin over the front of the fifth wheel-how to get that out of there. So it's important to know not to wreck the casing. So this is important for drivers to know because if your're driving around and you get a flat tire you don't want to run around until the casing is wrecked.īecause that casing alone is worth about $175. So what they do is they take the old casing when when the tread wears off, and they take it to a Kal Tire, or one of the other big tire manufacturers‚ Michelin, Goodyear, all those places and they put a new tread on top of the casing. On the rear of vehicles, these four tires the tandems, & the tires on the rear of the trailer - back there can be retreads. Retreads on the rear of Commercial Vehicles Don't Fail Your Pre-Trip Inspection Test…Buy the Course! Today we're gonna talk about tires on commercial vehicles and give you some information so that you can stay employed for one thing, and keep your job, keep rolling up and down the road. There is some belief in the industry that if they're 10 percent less- so ninety pounds of air, they're under-inflated. These tires hold a hundred pounds of pressure that's what the recommended inflation pressure is. Some driving instructors and some other people- truck drivers and what not-believe that they can tell the difference of a few pounds of pressure in these tires. My firm belief is is that the only thing that whacking a tire is going to tell you, is whether this inside dual is flat or not.īecause it's being held up by the tires on the outside. Now there is some discrepancy on this point. In a pre-trip inspection we whack the tires. Talking about tires on commercial vehicles, not just trucks, but this applies to buses as well.
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