A tiny rock, de-icing material or salt and sand can start the process of turning a perfectly good wheel into a rust-covered embarrassment or, worse, a safety hazard. To prevent that from happening, motor carriers are using effective maintenance techniques, while manufacturers are producing more corrosion-resistant wheels.

National sales data for off-road tires aren’t available because, compared with on-road tires, so few are produced.

As with on-road tires, incorrectly inflated vocational tires can be problematic — and so can mismatched tires.