Glossary

Tandem axle

Last reviewed: 2026-05-20

Source review note: This term covers a compliance, regulatory, or enforcement topic where current rules, annual updates, or carrier policy may affect the correct answer. Use this as background only. Verify applicable regulations and carrier policy before making decisions.

Two drive axles mounted close together on a tractor, sharing the drive load. Tandem axles on Interstates are federally limited to 34,000 lb combined weight under 23 U.S.C. 127. Tire rotation on tandem axles typically involves moving tires from the forward drive position to the rear, or swapping inner and outer positions.

Tandem axle tire wear depends on which axle carries more of the combined load — which varies by suspension type and load distribution.

Real-World Use

A maintenance manager reviewing tire wear on tandem positions notes the forward tandem consistently wears faster than the rear — consistent with the vehicle's suspension distributing slightly more load forward. Rotation intervals are adjusted accordingly.

What to Pair It With

Read this term with the full tire sidewall, vehicle rating information, manufacturer documentation, and the actual condition of the tire.

This site is for general information only. It does not replace professional tire service, DOT compliance advice, tire manufacturer instructions, vehicle manufacturer recommendations, or fleet policy.