120 vs 110 Dirt Bike Tire- Which One Better?

Regarding dirt biking, selecting the right tires is crucial for a smooth and safe ride. Choosing between 120 and 110 tires can be confusing, especially for beginners who may not fully understand the differences between these two sizes. While both tires are suitable for off-road riding, they have distinct features that make them unique. We’ll explore the key differences between 120 vs 110 Dirt Bike Tire and help you determine which is best suited for your needs.

We’ll cover everything you need to know before deciding which tire type is right for you.

120 vs 110 Dirt Bike Tire: Quick Comparison

Both 120 and 110 tire sizes are popular among dirt bike enthusiasts, and they have some slight differences you should know about before making your final purchase decision. The width is one of the primary distinctions between these two tire sizes. A 120 tire is more comprehensive than a 110 tire, which can provide better traction on uneven terrain.

A 120 tire will provide more grip and stability than a 110 tire due to its wider surface area. This makes it an ideal choice for riders who prefer aggressive riding styles and need maximum traction on all types of terrain.

If you primarily ride on more complex surfaces or prefer a more agile handling experience, a narrower 110 tire may be the way to go. It’s essential to choose tires that not only fit your bike but also match your riding style and environment.

It’s important to note that tire width measurements are not exact and cannot be compared. This means that even if two tires have the exact width measurement, they could still differ in size. Different manufacturers use different methods to determine tire sizes, confusing riders looking to upgrade their tires.

120 vs 110 Dirt Bike Tire: Table Comparison

Features 120/90-18 Dirt Bike Tires110/100-18 Dirt Bike TiresDifference
Diameter 26.5 inches26.66 inches0.6%
Width4.72 inches4.33 inches-8.3%
Sidewall height 4.25 inches4.33 inches1.9%
Aspect ratio9010010%
Circumference83.26 inches83.76 inches0.6%
Rim diameter18 inches18 inches0%
RPM760.95 revolutions756.45 revolutions-0.6%


A 120 tire has a diameter of approximately 26 inches, while a 110 tire is slightly smaller at around 25 inches. While this may not seem a huge difference, it can affect how well your bike handles certain obstacles or conditions. For example, a larger diameter tire will roll over rocks and roots more quickly than a smaller one, which could mean less strain on your body during long rides. It’s important to note that tire size isn’t the only factor that affects performance; tread pattern and rubber compound also play significant roles.


The 120 is typically wider than the 110, with an extra 8 millimeters wide. A wider tire means more surface area in contact with the ground, providing better traction and stability on loose terrains like sand or mud. These tires also tend to weigh more and may take longer to turn or accelerate. Narrower tires provide quicker acceleration and are lighter in weight for faster maneuvering through tight turns on hard-packed surfaces like dirt trails or tracks.

Aspect Ratio:

The aspect ratio is a crucial factor to consider when selecting the size of a dirt bike tire. This refers to the height of the tire’s sidewall relative to its width. A higher aspect ratio means a taller sidewall, while a lower aspect ratio means a shorter one. 

A 120 tire size has an aspect ratio of 80%, meaning its sidewall is relatively tall compared to its width. This can provide better stability and traction in certain conditions, such as loose or muddy terrain. The 110 tire size has an aspect ratio of 90%, making for a shorter, more rigid sidewall.


The circumference of dirt bike tires is crucial in determining the riding experience of your bike. The tire size affects everything from acceleration and braking to handling and stability.

A 120 tire has a larger circumference than a 110, meaning it covers more ground per rotation. This can make it easier for riders to accelerate quickly and reach higher speeds on straightaways. It also means that turning becomes more challenging due to the increased gyroscopic forces generated by the giant wheel.

110 tire has a smaller circumference than a 120, making it easier for riders to navigate tight turns and switchbacks.

Rim Diameter:

A 120 tire has a larger rim diameter compared to a 110 tire. The former measures around 18 inches, while the latter measures 17 inches. The bigger rim diameter of a 120 tire allows for better traction on rough terrain. It also improves stability when taking sharp turns and navigating tricky obstacles.

The smaller rim diameter of a 110 tire can provide faster acceleration and more responsive handling. It is also lighter, making maneuvering in tight corners or switchbacks easier. It is essential to consider the Rim Diameter when buying new tires for your bike to ensure that the selected tires are compatible with your bike’s rims. 


RPM stands for revolutions per minute and refers to how many times the engine’s crankshaft rotates in one minute. The higher the RPM, the more power your bike generates. When you switch from a 110 to a 120 tire size, you increase your wheel’s overall circumference, meaning that each rotation covers more distance than before. This results in fewer rotations per minute and decreases your RPM. This decrease in RPM does not necessarily mean your bike will be slower with a larger tire size.

Higher RPM means your engine is working harder and consuming more fuel to keep up with the increased rotation rate. This can result in a decreased fuel economy and increased wear and tear on your engine. 

120 vs 110 Dirt Bike Tire:

As someone who has been riding dirt bikes for years, I’ve always wondered about the difference between a 120 and a 110 tire. I decided to do some research and testing to find out which is better for my type of riding.

The wider footprint of the 120 tires also means it offers better stability when cornering and jumping. A narrower 110 tire will provide quicker handling and more precise tight-turn steering. It’s important to note that the ideal tire width depends on your riding style and personal preferences. 

For example, if you’re a beginner rider looking for more stability on rough terrain, a wider 120 tire might be your best option. More experienced riders who prioritize speed and agility might prefer the quicker response of a narrower 110 tire.


After comparing the 120 vs 110 Dirt Bike Tire sizes, I found pros and cons. The 120 tire provides more stability and traction on rough terrain but can add weight and affect maneuverability. The 110 tire is lighter and more agile but may not perform as well in challenging conditions.

The decision comes down to personal preference and intended use. Before making a choice, consider your riding style and the type of terrain you will be tackling. Whatever you decide, properly maintain your tires for optimal performance and safety on every ride.


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