SIZE GUIDE
A tire size looks like a serial number until someone explains it. These guides break down the sizing systems you run into on mowers, garden tractors, and trailers so you can order the right replacement the first time.
A 10-28 didn’t disappear — it became an 11.2-28. Here’s the verified chart for the renames that show up on our own antique fit pages, the fronts that never changed at all, and the rim-width catch that trips up restorations.
7 MIN · JACOB
TR-13 fits a 0.453″ rim hole, TR-15 fits a 0.625″ hole — the split runs by rim diameter, not by how old the machine is. How to measure your hole in 30 seconds, and which stem our stocked sizes actually use.
5 MIN · JACOB
Buy the tube for the tire size on your sidewall — tubes stretch to cover a range, which is why combo sizes like 4.00/4.80-8 and 550/600-16 exist. Plus TR-13 vs. TR-15 stems and when you need a bent one.
5 MIN · JACOB
The sidewall max is the ceiling, the manual has the target, and both are far below car habits. How to find your number, the soft-vs-firm trade, and the wear patterns that say you got it wrong.
5 MIN · GREG
Ply is a strength rating, not a layer count — a modern 4-ply has nothing like four layers. Here’s what 2, 4, and 6 ply really buy you, how load range letters map, and when more ply is wasted money.
6 MIN · JACOB
Modern mower tires are tubeless and fine that way — until rust pits the rim where the bead seals. Here’s when a tube saves the wheel, when tube-in-tubeless is fine, and when it’s lipstick on a dead tire.
5 MIN · GREG
About 23″ tall, 10.5″ wide, on a 12-inch rim — and that last number is the rim’s diameter, not its width, no matter what half the internet says. Here’s the size decoded, plus the machines that run it.
5 MIN · JACOB
4.80-8 means about 4.8 inches wide on an 8-inch rim — height isn’t in the number. Here’s how to read the two-number system, the 4.00-8 mix-up to avoid, and the one tube that covers both.
5 MIN · JACOB
Valve core, bead seat, puncture, dry rot, rim — in that order, cheapest first. A spray bottle of soapy water finds all five. Here’s the ladder, plus when the fix is a tube and when it’s a new tire.
6 MIN · GREG
Three different sizing systems show up on mower, garden-tractor, and ag tires. Here’s how to read all three — and match a replacement without guessing.
6 MIN · JACOB
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