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Dirt Bike Tire Information
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Dirt Bike Tires
Search by your machine's make, model, and year. Browse all of our tires and filter using brands, sizes, type, or price range.
Selecting New Tires
When selecting new tires, make sure they meet the requirements of your motorcycle and its expected usage. Always refer to the owner's manual and tire manufacturer's website for recommended tire size, construction, performance, and suggested air pressure.
Dirt Bike Tire Terrain Types
Soft Terrain
Taller knobs penetrate loose dirt for better traction. The knobs are also spread out to help keep the tread cleaned out from mud and sand.
Medium/Intermediate Terrain
The middle ground between soft and hard terrain tires. They perform well on most surfaces.
Hard Terrain
Knobs are closer together to make a large contact patch for maximum traction in hard and rocky conditions.
Sand
Paddled tires designed for soft and deep sand.
Trials
Very soft and grippy rubber compound. Designed to give as much grip as possible on hard and slick surfaces.
Hybrid
Soft gummy rubber compound that combines the best characteristics of an off-road knobby tire and a trials tire.
Dirt Bike Tire Measurements
Dirt Bike tires are commonly measured in Millimeters,
while the rim diameter is in inches.
Width x Aspect Ratio x Rim Diameter (inches).
Term Definitions
Aspect Ratio: The aspect ratio is the height of the sidewall in relation to the width of the tread. For example, on the tire size above, the aspect ratio is 90% of the tread width (the first number in the tire size), creating a 99-millimeter sidewall height.
Radial: Radial constructed tires are more common with street tires and utilize both ply and breaker (or belt) cords. The ply cords extend from bead to bead at approximately a 90-degree angle to the centerline of the tire. The breaker (or belt) cords are placed on top of the ply cords across the width of the tire. Radial constructed tires are more common with street bike tires.
Advantages: Adding breaker (or belt) cords results in a stiffer carcass which helps provide a longer tread and tire life, better steering control and handling, overall smoother ride and comfort, and higher tread puncture resistance.
Bias: Bias tires typically have the ply cords that extend diagonally from bead to bead at a range of 30 to 60-degree angles from the centerline. Each successive ply is laid at an opposing angle, forming a criss-cross pattern.
Advantages: The design allows the entire tire body to flex easily, giving a comfortable ride on rough surfaces.
Dirt Bike Tire Conversion Chart
| Metric | Inches | |
|---|---|---|
| 70/100x17 | 2.75x17 | |
| 80/100x21 | 3.00x21 | |
| 90/100x14 | 4.10x14 | |
| 90/100x16 | 4.10x16 | |
| 100/100x18 | 4.10x18 | |
| 110/100x18 | 4.50x18 | |
| 120/100x18 | 5.10x18 | |
| 130/80x18 | 5.30x18 | |
| 140/80x18 | 5.60x18 | |
| 100/90x19 | 4.10x19 | |
| 110/90x19 | 4.50x19 | |
| 120/90x19 | 5.10x19 |
Maintenance
Checking tire pressure is the most important tire maintenance function you can perform. Check cold tire pressure frequently with a good-quality gauge that holds a reading - and always before extended trips. Inspect tires frequently for damage, and always heed warning signs such as vibration, handling instability, rubbing, or tire noise that occurs during the operation of your dirt bike.
Maintenance: Regular inspection of the dirt bike generally, and of wheels/tires in particular, is suggested because tire mileage and performance are adversely affected by a poorly maintained vehicle. Refer to the owner's manual for recommended suspension settings. Improperly maintained components and incorrect or unbalanced front fork pressures will affect stability. Low suspension pressure will generate excessive tire stresses.
Sidewall treatment: Use a mild soap solution to clean sidewalls, white striping or lettering. Rinse off with plain water. Never apply any other material, cleaners or dressings to enhance sidewall appearance. These may degrade the rubber and remove inherent ozone-cracking/weather-checking resistance.
Tire storage precautions: The treatment that tires receive during extended periods of inactivity may directly affect their mileage and performance
- Temperature: Try to avoid frequent and varied extremes of temperatures during storage. Do not keep tires next to radiators or sources of heat. Tires subjected to these conditions will age more quickly than those stored in a cool, constant environment.
- Sunlight: Tires stored in direct sunlight for long periods of time will harden and age more quickly than those stored in a cool, constant environment.
- Ozone: Do not store tires where electric motors are present. The high concentration of ozone will accelerate tire aging.
- Oil and gasoline: Prolonged contact with oil or gasoline causes contamination of the rubber compound, making the tire unsuitable for use. Wipe off any oil or gasoline immediately with a clean rag. Do not use any tire that has been exposed to oil, gasoline, corrosives or non-rubber compatible liquids.
Safety Precautions
Safety tips: Refer to your machine's documentation for proper maintenance. Always give tires a gentle "run-in" period to get the feel of new tires. Always match the front and rear tires for optimal handling, safety, and performance. Mixing radials with bias or belted-bias tires may adversely affect handling and stability. Worn/unworn tire combinations and worn tires used in wet conditions can result in deteriorated handling.
Air pressure: Always maintain the recommended tire pressure for the type of motorcycle that is being ridden; check the owner’s manual. Underinflated tires may cause wheel damage when ridden on rocky, rough terrain and allow the motorcycle to squirm or wander on smooth, hard terrain. Overinflation may damage the tires and cause an unnecessarily harsh ride. To accurately measure tire pressure, use a standard tire pressure gauge.
Inspection: Check for cuts and gouges that may cause air leakage. Also, check the tires for missing knobs and excessively worn tread. Wheels: To avoid loss of control or injury, make sure axle nuts are tight and secured. Grasp each tire at the front and rear and try to rock it on its axle to detect worn-out bearings or loose nuts. There should be no free play or slip as you rock the wheel. Inspect wheels for broken or loose spokes and for cracks on the hub or rim.
Tire Mounting Guidelines: Only specially trained persons should mount tires. Improper mounting can cause tire explosion and serious injury. Never exceed the tire manufacturer’s recommended maximum pressure when seating any tire. Never inflate above your tire manufacturer’s recommended psi amount to seat beads. Maximum pressure can be found on the sidewall of each tire.
Signs you could need new dirt bike tires: The primary thing to look at with tires is the tread. Is it worn too short? Are the knobs rounded? Are they showing other signs of wear (like cracks)? If so, it might be time for new tires. Worn/unworn tire combinations and worn tires used in wet conditions can result in deteriorated handling.
Warning
The charts and info on this page do not imply interchangeability. Consult your machine's manual to determine correct replacements, clearances, compatibility and stability, load-bearing capacity, speed rating, radial vs. non-radial recommendations and front-to-rear tire matching. Incorrect selection can result in tire failure or loss of control with serious injury or death.