What issues do fleets face when buying tires for their trailers? Jim Park knows. Park, who writes for fleets as equipment editor for Modern Tire Dealer’s sister publication Heavy Duty Trucking, covered the topic in HDT’s July issue.
We often publish his stories in our Commercial Tire Dealer section in order to share with you insightful practices from the fleet’s perspective. By knowing what is important to fleets, you get what amounts to insider information.
Do you need to put new tires on a trailer? As it turns out, a lot of fleets do buy new tires for trailers, and for very good reasons. But there are probably an equal number content to cycle their older drive and steer tire casings back to a trailer position to let the trailer finish them off.
Trailers don’t have to be a tire graveyard, but that’s often the case. They tend to be neglected and rarely see proactive maintenance. In the truckload sector, where trailers can disappear into drop yards scattered around the country, it’s not uncommon for a tire to go six months or longer without any attention. Tires are often stolen from trailers left in drop yards, too.
Fleet maintenance consultant Darry Stuart, operating as DWS Fleet Management Services, says crooks can steal a tire right off the rim of a parked trailer in less than 30 seconds.
“I had a tire guy show me how it’s done,” he says. “They take off the valve stem, let some of the air out and then punch in the sidewall. The air dumps and then they break the tire off the rim. They are gone with your tire in no time.”
That might seem a pretty compelling reason to limit your theft exposure by leaving some scabby old carcass on the trailer. Who’d want to steal something like that? On the other hand, if customer service and driver satisfaction are more important than losing a few tires to a five-finger discounter, then you can make a good business case for newer tires and even retreaded tires.
It’s common practice to retread a steer or drive tire once and place it into a drive position, then retread it a second time and move it to the trailer. Trailers in the truckload sector, where trailer to tractor ratios are up to three to one, will run as few as 40,000 miles per year. In that scenario, you can easily get up to seven years out of a well-maintained, deep-rubber tire, providing it suffers no catastrophic failures and doesn’t get stolen. In such a scenario, a retread or a new tire makes a lot of sense.
The deep rubber, Stuart says, is a hedge against perforation.
“I get arguments on this all the time,” he says. “Everybody is all over fuel economy, and so they run their tires down as low as they can to reduce the rolling resistance. And that’s fine, but what about protecting the tire against road hazards?”
Stuart says an average tire service call today runs close to $1,000 with a new tire, and rarely takes less than three hours from breakdown to back on the road.
“You’d have to make a lot of fuel savings to pay for that service call,” he points out. “And then you have the risk of making a driver angry and possibly the customer too with a late delivery. A lot of the big shippers today won’t even look at a bid from a carrier with a less than 98% on-time performance. That’s a lot to wager on a well-used, thin-tread tire.”
Stuart recommends pulling the tire at 6/32 or 7/32 rather than the federally required minimum. That thought is seconded by Gary Schroeder, director of commercial vehicle sales for Cooper Tire & Rubber Co., assigned to the Roadmaster brand.
Schroeder notes that Department of Transportation regulations say steer tires must be pulled at 4/32-inch remaining tread depth and drive and trailer tires must be pulled at 2/32-inch remaining tread depth.
“Some fleets will pull steer or drive position tires early to help maintain traction and rotate them back to the trailer to run out their remaining tread life,” he explains. “If the fleet’s application tends to experience penetrations from nails or other road debris, then it’s probably a better practice to pull the tires early and retread them to help preserve the casing integrity.”Special applications
Tread depth is especially important for fleets using spread-axle trailers, which are notoriously hard on tires.
“Fleets that pull these trailers need tires with deep, 18/32 tread depth for extended life (or normal-life for a high-scrub tire), high-scrub compounds to help resist curb damage, durable casings and robust rib designs to help minimize tread tear,” says Evan Perrow, marketing manager at Goodyear Tire & Rubber Co.
Goodyear designed its G619 RST specifically for spread-axle trailers. Other companies also make models that appear to thrive in that hostile environment, such as the Continental HSR2, Michelin XZE and Bridgestone Ulti-Rib designs, which incorporate stabilizer ribs to combat irregular wear and rounded shoulders for spread-axle applications.
Similarly, while long-haul fleets often seek wear-extending or low-rolling resistance attributes in their trailer tires, regional and urban operators seek a tire that easily shakes off the threats from curbing, scrubbing and scuffing common to that application. “For regional applications, you want a tire with a thicker tread, say 19-23/32,” says Walt Weller, senior vice president of sales and operations at China Manufacturers Alliance LLC, a subsidiary of Double Coin Holdings Ltd.
“You’ll need a tire that’s cut- and scrub-resistant, and can take some abuse from drivers running up on curbs and over certain hazards.
“Just dragging a trailer around city street corners all day will take a toll on the tires sooner rather than later.”
Retreading is a cost-effective way of maintaining a stock of service-ready trailer tires. Top fleets know that retreads play a major role as a tire program best practice. Retreads for trailer tires are available in SmartWay-verified models, with tread designs tailored to fuel efficiency, wear battling, or extra-long life.
“Given that retreads typically cost a fraction of a new tire and perform as well as or better, it makes sense for the bottom line to incorporate retreads into a tire program,” says Sherrell Watson, communications specialist for commercial tires at Bridgestone Americas Inc. “Truck tires are simply too big of an expense not to consider retreading.”
When considering this option, it’s important to take into account the quality of the casing.
“The casing quality will tell you a great deal about the tire — how it will hold up and the value the tire has for its second and third life in retreading,” says Schroeder. “Our Roadmaster brand tires offer a warranty of two retreads within six years.”
As Stuart suggests, a tire in a trailer position can last up to seven years, so a quality casing is certainly called for.
Another procurement strategy is to spec new trailers with drive tires. When the trailers are delivered, those tires are stripped off the vehicle, put into stock and replaced with retreaded tires from inventory. Fleets are researching where they can get the best pricing on the tires — from the trailer builder, from the tire supplier, from a tire dealer, adding up the costs including labor and restocking charges.
“There’s usually a pretty steep upcharge from the zero-dollar standard tire option when going up to a drive or steer tire,” cautions Stuart. “Often, the math just doesn’t work, but depending on how you account for the tire costs, it may work for some fleets.” If it does, spec’ing drive tires on the trailer can be a cost-effective but labor-intensive way of building your drive tire inventory.On the other hand, spec’ing a trailer tire with a shallow tread depth, say 11/32-inch, will give a year or so of fairly fuel-efficient operation before you have to worry about the tread becoming too thin to resist punctures. “There is just no way to say this option or that one will work for all fleets,” Weller reminds us. “Any number of strategies will work for most fleets, including combinations of new, used and retreaded tires.” Remember the highest risk exists in the extremes. Thinner tread at end-of-life will yield the lowest rolling resistance, but it will also expose your customer to the greatest risk for a mission-crippling puncture. Cheaper tires from the outset may not provide the longest miles to take-off or multiple retread opportunities. Premium tires may get scuffed and curbed to a premature death by drivers who aren’t careful when driving in urban environments.
“Fleet managers should identify the average miles that can be expected on each wheel position and application within the fleet,” Perrow says. “This allows a fleet manager to identify areas of opportunity for improvement and create a set of best practices. It also helps with budgeting and fleet cost predictions.”
But keep this in mind: You can’t fix what you can’t measure. Determining which approach works best for trailer tires still requires tracking and monitoring to get a measurable result. From there, you can take steps to get the best performance from the tires themselves and the capital tied up in the program.
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