How to Read a UTV Tire Size

The Stamp on Your Sidewall Is the Whole Spec Sheet

Every UTV tire carries its size molded into the sidewall, and once you know the code it tells you the tire's height, its width, how it is built and what wheel it fits. That one stamp is what you match when you replace a tire, what you measure against when you size up, and what we ask for when you call about fitment. Here is how to read it, using sizes from tires on our own shelves.

The Common Format: 30x10R14

Most modern UTV tires use the flotation-style stamp, and it reads left to right:

• 30 — the tire's overall height in inches, mounted and inflated. This is the number that decides clearance, gearing and whether the tire fits your machine at all.
• 10 — the tire's width in inches, across the tread. Width decides flotation in sand and snow, and how much room the tire needs inside the fender at full steering lock.
• R — radial construction. The cords inside the carcass run radially, across the tire, which is why radials ride smoother and run cooler. Our radial vs bias guide covers what the construction changes on the trail.
• 14 — the wheel diameter in inches the tire mounts on. A 30x10R14 only fits a 14-inch wheel. Height and width can change as you size up; this number cannot, unless the wheels change too.

So a Tusk Terrabite in 30x10R14 is a 30-inch-tall, 10-inch-wide radial for a 14-inch wheel. The same tire's 32x10-15 size (you will also see it written 32x10R15) is two inches taller on a 15-inch wheel — that wheel change is part of why sizing up often means new wheels, or a mounted package that pairs them.

The Dash Means Something Too

Some sizes are stamped with a dash instead of an R — 25x8-12 instead of 25X8R12. Traditionally the dash marks bias construction, and you can see both stamps side by side in one tire family on our shelves: the Sedona Mud Rebel is a bias tire stamped 25x8-12 ($128.95), while its radial sibling the Mud Rebel R/T is stamped 25X8R12 ($175.95). Two honest warnings about the dash: some brands print small sizes without the R even on radial tires, and old stock photos do not always match the current stamp. The sidewall on the tire itself is the authority — read the one in front of you.

Widths, Decimals and Staggered Sets

Widths are not always round numbers. A 35x10.5-15 is ten and a half inches wide, a 29X9.5R15 is nine and a half, and a 33X9.50R15 — like the Sedona Ridge Ripr at $300.95 — is a tall, narrow tire built for a different kind of grip than a 10-inch width. Narrower front and wider rear tires are also normal: many machines run a staggered setup, a 9-inch-wide front with an 11-inch-wide rear, which is why sets of four are sometimes two sizes, not one. When you read a listing here and see "front" and "rear" sizes, that is the stagger — both halves matter.

The Numbers Around the Size

• Ply rating — stamped as "8 ply rated" or similar. It is a strength rating, not a literal count of layers. Our ply ratings guide explains what the number does and does not promise.
• Load and pressure stamps — the sidewall also carries the tire's maximum load and the maximum pressure that load rating is measured at. That max pressure is a ceiling for seating and load, not a recommendation for trail pressure — our pressure guide covers where to actually run them.
• Compound notes — some tires add a compound callout instead of changing the size stamp: standard vs competition (sticky) versions of the same size are different tires in the same dimensions. The sticky vs standard guide explains when the soft compound is worth it.

Putting It to Work

Read the stamp on the machine you own before you shop: it is the only fitment fact nobody can argue with. Then decide what you are changing — taller for clearance, wider for flotation, a different construction for ride — and check what your machine clears in the tire sizes by machine guide. When you are ready, the full range is in the UTV tire collection, and the trail riders' shortlist is in our trail tire guide. Tell us the stamp on your sidewall and where you ride — contact Dirti Motorsports and we will confirm the size before you order.