Tires: The Third-Largest Maintenance Expense
A tractor-trailer combination rolls on 18 tires. New steer tires cost $350-$550 each, drive tires $280-$450, and trailer tires $200-$350. A full set of 18 new tires runs $5,000-$8,000. Most operators replace tires in sets of 2-4 at a time, but the annual tire expense for a truck running 120,000 miles is typically $4,000-$7,000 including replacements, repairs, and roadside flats.
Tire cost is best measured in cost per mile rather than cost per tire. A premium steer tire at $500 that lasts 200,000 miles costs $0.0025/mile. A budget tire at $300 that lasts 80,000 miles costs $0.00375/mile — the 'cheap' tire actually costs 50% more per mile. This is why experienced operators buy quality tires for steer and drive positions and save money on trailer tires where tread life matters less.
Tire Costs by Position and Type
Steer tires (position 1): replace every 150,000-250,000 miles. These are the most important tires on the truck — they control steering response and are your first defense against blowouts. Never skimp on steer tires. Budget $350-$550 per tire. Top choices: Michelin XZA3+, Continental HSL2, Bridgestone R283. Drive tires (positions 2-3): replace every 200,000-350,000 miles depending on tread depth and retread history. Budget $280-$450 per tire for new, $140-$200 for retreads. These tires handle torque and traction.
Trailer tires (positions 4-5): replace every 150,000-250,000 miles. These take the least stress and are the best candidates for retreads. Budget $200-$350 new, $100-$160 retread. Retreading is where you save real money — a quality retread performs 80-90% as well as a new tire at 40-50% of the cost. Most operators retread drive and trailer tires once (some twice) before casing condition makes it impractical. Avoid retreading steer tires — the risk of a steer-tire failure is not worth the $200 savings.
Maximizing Tire Life and Reducing Costs
Tire pressure is the number-one factor in tire life. Under-inflated tires wear faster, run hotter, and increase fuel consumption. Over-inflated tires wear unevenly in the center and are more prone to impact damage. Check pressure weekly with a calibrated gauge — the pressure stamped on the sidewall is the maximum, not the optimal operating pressure. Most steer tires run best at 105-110 PSI, drives at 95-105 PSI.
Alignment checks every 50,000 miles prevent uneven wear that kills steer tires prematurely. A $150 alignment check that catches a problem early can save $600 in premature tire replacement. Rotate trailer tires from the front axle to the rear axle halfway through their life since front trailer tires wear faster from scrubbing during turns. Buy tires from dealers who offer road hazard warranties and free roadside tire service — TA/Petro, Love's, and Pilot all offer fleet tire programs with per-tire pricing that beats retail by 15-25%.
Tire Budget and Replacement Schedule
Budget $0.03-$0.05 per mile for tires ($3,600-$6,000/year at 120,000 miles). Set up a tire tracking spreadsheet: for each position, record the tire brand, date installed, mileage installed, tread depth at installation, and check tread depth every 30,000 miles. This tells you exactly when each tire will need replacement and prevents surprises.
Keep one spare steer tire and one spare drive tire either on the truck or at your home base. A roadside tire service call costs $200-$400 for the service plus the tire cost, and wait times can be 2-6 hours. Having your own spare and a basic tire change kit (impact wrench, torque wrench, lug socket) lets you handle simple changes yourself or at least provide the tire to the service truck and save the markup.
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