What does 4.80-12 mean on a trailer tire?

The short answer: 4.80-12 means the tire is about 4.8 inches wide and mounts on a 12-inch rim — the same width number as a 4.80-8, but built for a bigger wheel, and it doesn’t swap with one. If your trailer’s sidewall reads 4.80-12, that’s the whole size — here’s what it gets you.

This is the small-trailer size you’ll find on single-axle utility trailers and boat trailers running a 12-inch wheel — one step up from the 8-inch carts-and-dollies world. Four minutes here and you’ll know exactly what to order, plus the one mix-up that costs people a return shipping label.

The two-number system, on a 12-inch rim

4.80-12 uses the same two-number format as a lot of small-equipment tires: the first number is section width in inches, the second is rim diameter in inches. So 4.80-12 reads as a tire roughly 4.8″ wide across the tread, built for a wheel that measures 12″ across at the bead seat. Nothing in that number states overall height — that’s the part everyone assumes is in there and isn’t. For the full rundown of how two-number and three-number sizes differ, our guide to reading tire sizes covers both formats.

Not the same tire as a 4.80-8

4.80-12 and 4.80-8 share a width number and nothing else that matters. The second number is a rim diameter, and it has to match your wheel exactly — a 4.80-12 will not stretch onto an 8-inch wheel, full stop. That matters because these two sizes get confused constantly: worn sidewalls are hard to read, and a 12-inch wheel and an 8-inch wheel can look closer in person than the numbers suggest. Measure your rim, don’t eyeball it.

Same section width, a genuinely different tire. If your sidewall reads 4.80-8 instead, our 4.80-8 explainer covers that size the same way. And if you’re trying to decide between the two stocked 8-inch trailer sizes we carry, the 4.80-8 vs. 5.70-8 comparison walks through that call.

How tall does a 4.80-12 stand?

A 4.80-12 stands roughly 20.5 inches in overall diameter mounted and inflated — a figure that comes from trailer-tire fitment references, not our own spec sheet, since the two-number size itself never states height. That’s meaningfully taller than the 15–16″ neighborhood a 4.80-8 lives in, which tracks: same width, four more inches of rim to wrap around. If fender clearance or a matched-height spare is the question, measure your current tire’s full diameter rather than trust the size alone — brand and tread pattern shift the number slightly.

What actually runs a 4.80-12

4.80-12 is a step up from the 8-inch cart-and-dolly world — this size shows up on single-axle utility trailers and boat trailers running a 12-inch wheel, the kind that actually see highway speed rather than getting pushed across a yard. We stock it as the Deestone D901, 6-ply, Load Range C, rated for 990 lbs at 90 psi — the specific tire this size guide is about. Ply and load range matter more than tread pattern here: a trailer tire carries its full rated load constantly, at highway speed, not just when someone’s pushing on it. Browse the full lineup on the trailer tires page, or start from the small trailer tire guide if you’re not sure yet which of our three stocked sizes fits your trailer.

Tubeless, tubed, and the combo tube

The D901 4.80-12 ships as a tubeless tire and holds air fine on a clean, rust-free 12-inch wheel. Older steel trailer wheels are the exception — corrosion at the bead seat is the usual cause of a cart or trailer tire that goes soft every few weeks, and a tube is the standard fix. If yours needs one, the stocked 4.80/4.00-12 combo tube with a TR-13 valve stem covers both the 4.80-12 and the 4.00-12 tire sizes — one tube, either size, because they’re close enough in diameter on the same rim to share one. Details on how that combo sizing works (and the valve-stem question in general) are in the inner tube size guide. Find the tube itself on the inner tubes page.