Reading ATV tire sizes

ATV tires use a format such as 25x8-12 or 25x8R12. The first number is the overall height, the second is the tread width, and the last is the rim diameter, all in inches. An R indicates radial construction, while a plain dash means bias ply. Mixing sizes or types front and rear can change handling, so follow your machine's recommendations.

The ply rating is a strength designation rather than a literal count of layers. Higher ratings generally resist punctures better but can ride firmer.

Tread patterns by terrain

• Mud and all-terrain: Deeper, wider-spaced lugs clear mud, though they can wear faster on hardpack.
• Sand: Paddle or smooth-front designs float on loose dunes.
• Sport and trail: Shorter lugs favor traction and steering on groomed trails.
• Radial versus bias: Radials often ride smoother and last longer, while bias tires are common and can be tougher on sidewall.

Wheel details

ATV wheels are described by diameter and width, such as 12x7, along with the bolt pattern, for example 4 on 110 or 4 on 156. Backspacing or offset affects how far the tire sits from the machine. The bolt pattern must match the hub exactly, and the lug nut seat should suit the wheel.

Check the vehicle's maximum tire size, clearance at full steering lock and suspension travel, and the load rating before choosing a larger tire.

Mounting and safety

ATV tires mount on rims at low pressures, usually in the single-digit psi range, so follow the pressure printed on the sidewall or in the owner's manual. Seat beads carefully, use proper tire tools, and torque lug nuts to the machine's specification. Oversized tires can strain axles, bearings, and CV joints, and can change handling, so confirm fitment for your specific make, model, and year before choosing.

Choosing by riding style

Think about where you ride most. Wooded trail and mud riders benefit from deeper lugs and sturdy sidewalls, dune riders want paddle or smooth-front sand tires, and mixed riders may choose an all-terrain tread that compromises. Size and weight also affect acceleration and fuel use.

Replace tires as sets or at least in axle pairs, check the wheel nuts after the first ride, and inspect for cuts and bulges. Keep a plug kit and hand pump on rides far from the trailhead, and carry a tire gauge made for low pressures.

Check the condition of the machine at the same time. Worn wheel bearings, tie rod ends, and ball joints show up more with big tires, so inspect them before installing a new set. Make sure axle nuts and wheel studs are in good shape, and replace damaged studs rather than reusing them.

Understand how sidewall type affects handling. Softer sidewalls conform to terrain and ride smoothly but can roll at speed, while stiffer ones give crisp steering and carry loads better. Higher pressure within the tire's range helps on hardpack, and lower pressure helps in sand or mud.

Remember that tire and wheel combinations are also affected by offset and width. Wider wheels increase scrub radius and steering effort, so choose widths with the machine's design in mind. Keep a record of your tire sizes and part numbers for future replacements.