Class A vs. Class B CDL: Which Training Fits Your Vehicle?

Q: What is the weight difference between Class A and Class B?

Under 49 CFR 383.91(a) , Class A covers a combination vehicle with a gross combination weight rating of 26,001 pounds or more, as long as the towed unit itself is rated over 10,000 pounds. Class B covers a single vehicle rated 26,001 pounds or more, or one towing a unit rated 10,000 pounds or less.

26,001 pounds is the number that decides it. Class A is a combination vehicle at or above that weight towing something over 10,000 pounds. Class B is a single vehicle at or above that weight on its own.

Published October 7, 2026 at 10:40 AM EDT by Chris Nesbitt

The exact federal threshold

49 CFR 383.91(a) draws the line, and it's more specific than most people expect.

Class A: a combination vehicle with a gross combination weight rating of 26,001 pounds or more, as long as whatever's being towed is itself rated over 10,000 pounds
Class B: a single vehicle rated 26,001 pounds or more on its own, or one towing something rated 10,000 pounds or less

Notice what actually matters here. It's not the total weight alone. It's whether you're pulling a heavy trailer behind a separate unit, or driving one vehicle that carries its own weight.

What that looks like on the road

A tractor-trailer, the classic eighteen-wheeler, is Class A. The tractor and the loaded trailer are two separate units, and that trailer alone clears 10,000 pounds easily.

A straight truck, a dump truck, most box trucks, and plenty of large buses fall under Class B instead. One vehicle, one frame, no separate heavy unit being towed behind it.

Different training, not more or less training

ELDT theory splits the same way. Class A uses the curriculum in 49 CFR Part 380, Appendix A. Class B uses Appendix B. They're not a longer version and a shorter version of the same material, they're built around the vehicle type you'll actually be driving.

Buy the course for the vehicle you're actually getting licensed for. Not the one you think you might drive in five years.

Upgrading later is normal, not a shortcut

Plenty of drivers start with Class B and move to Class A once the job calls for it. When that happens, federal law treats you the same as a first-time Class A applicant for training purposes, same Appendix A curriculum, no separate shortened upgrade path written into the rule.

That's not a loophole closing on you. It's just how the rule is written, and it means the training you'd need to upgrade later is already a known quantity today.

Pick the one that matches your vehicle

View our Class A and Class B courses, $15 each, built around the vehicle you're actually getting licensed for.

Questions people ask

What is the weight difference between Class A and Class B?

Under 49 CFR 383.91(a), Class A covers a combination vehicle with a gross combination weight rating of 26,001 pounds or more, as long as the towed unit itself is rated over 10,000 pounds. Class B covers a single vehicle rated 26,001 pounds or more, or one towing a unit rated 10,000 pounds or less.

Does Class A training cover more than Class B?

They cover different required curricula under 49 CFR Part 380, Appendix A for Class A and Appendix B for Class B, built around the vehicle type, not a simple more-or-less ranking.

If I have Class B, do I need separate training to upgrade to Class A?

Yes. An upgrade to Class A follows the same Appendix A training required of a first-time Class A applicant. There's no separate, shorter upgrade curriculum defined in the federal rule.