Average Dirt Bike Dimensions (With 21 Examples)

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There are so many different sizes of dirt bikes, from kids size to adult. I’ve been wondering, what are the average dimensions of dirt bikes for the two different ages? Here’s the low-down:

The average adult dirt bike dimensions are as follows:

  • Average Seat height is 37.0 inches
  • Average length is 85.7 inches
  • Average width is 32.4 inches
  • Average weight is 252.0 lbs.

The average kid’s dirt bike dimensions include the following: seat height is 24.9 inches; bike length is 50.4 inches; bike width is 25.7 inches; finally, the bike weight is 137.5 lbs.

Here is a compilation of 21 dirt bikes for adults and kids from some of the most well known and popular dirt bike companies:

What are the dimensions of dirt bikes?

When you are looking for a bike, a major deciding factor is how well it fits you as the rider. Seat height, length, width, and weight are the four major dimensions you should probably know about.

Seat Height:

The seat height of your bike can determine your comfort level while riding, as well as your safety. The average seat height for an adult categorized dirt bike is 37 inches and the average seat height for a child’s dirt bike is 24.9 inches.

Some dirt bikes have the option to adjust the height of the seat how you need it. For bikes that do have available adjustability, most dirt bike seat height measurements are taken when the bike is adjusted at the lowest height.

What is the right seat height for you?

Of course, this depends on preference, but there are some general guidelines to consider. I would HIGHLY recommend that you try out the dirt bike (before you make your purchase) to make sure it’s the right size for you. But for more standardized measurements, here’s a link to an article with excellent seat height recommendations based on your height.


The length of your bike can determine the comfort and strain placed on your body while you’re riding. The average adult dirt bike length is 85.7 inches and the average kid dirt bike length is 56 inches.

The big deal with dirt bike lengths is that generally the longer the bike is the farther back the seat sits from the handlebars. I don’t think that you want to have to strain your arms just to reach your primary steering. First of all, that’s uncomfortable. Second, it’s just not safe. Finding a bike that’s not too long or too short will help ensure that you have good control over where your bike takes you.

If you find that the distance between you and your handlebars is a little too far, you can also adjust the wheelbase of your bike to give you a more comfortable space. For more information about what to consider about dirt bike lengths, you can find helpful notes about how to wheelbases and trailer here.

TRYING TO FIT YOUR DIRT BIKE IN YOUR CAR? You’re definitely not alone! That’s why this website has a very helpful guide on which trucks, vans, SUVs, and more can fit a dirt bike inside. Trust me, this guide is a lifesaver.


The main ways that width can affect your bike is the bulkiness and aerodynamics of your machine. The average adult dirt bike width is 32.4 inches, while the average kid dirt bike width is 25.7 inches.

The width of your bike is mostly a personal preference for whatever style of bike you’re looking for. For example, some people are looking for a slimmer looking bike, while others might not mind the bulk or like some of the bulkier features of a bike.

Extra width, however, can lead to more weight on your bike overall, so keep that in mind.


The weight of a bike is probably one of the major key components to the bike’s performance. The average adult dirt bike weight is 251.9 lbs. The average kid dirt bike weight is 137.5 lbs.

The weight of your dirt bike affects the speed of and control available for the bike. Generally speaking, the lighter the bike is, the faster the bike is able to go because there is not as much weight for the engine to carry. If you’re looking for a bike that can ride faster, I suggest looking for a bike that has lighter weight compared to other bikes in that cc engine range.

For those of you who are new to dirt biking, the best advice that I have to offer is to choose a lighter bike with a lower cc engine. Bikes that are lighter are easier to control and turn because you are able to react faster while riding them.

One other aspect of the dirt bike’s weight that’s important to consider is how much the rider weighs. Heavier dirt bikes (that have a higher cc 4-stroke engine) can support more weight while riding. Thus, they will perform better. For more information on how much weight a dirt bike can support and other aspects to consider, you can check out more information here.

Adult Dirt Bikes:

Dirt BikeSeat HeightLengthWidthWeight
Yamaha WR250R36.6 in85.6 in31.9 in278 lbs
Suzuki DR-Z400S36.8 in90.9 in32.5 in317 lbs
Honda CRF230F34.6 in81.1 in31.5 in249 lbs (curb)
Kawasaki KX250F37.2 in 85.5 in 32.5 in233.6 lbs
KTM 250 XC-F37.8 in218.7 lbs
Suzuki RM-Z25037.6 in85.4 in32.7 in 230.4 lbs
Yamaha YZ250FX38.0 in85.2 in32.5 in249 lbs (wet)
Honda XR650L37.0 in86.2 in33.7 in346 lbs
KTM 250 Freeride F36.0 in203.9 lbs
Kawasaki KX50037.4 in86.2 in 32.1 in220.4 lbs
Honda CRF250X37.7 in85.5 in32.5 in224.8 lbs

Kid Dirt Bikes:

Dirt BikeSeat HeightLengthWidthWeight
Honda CRF50F21.6 in51.3 in 22.9 in110 lbs (curb)
Yamaha PW5018.7 in49.0 in24.0 in90 lbs
KTM 50 SX Mini22.0 in36 in88.2 lbs
Kawasaki KLX11026.8 in61.4 in25.6 in165.5 lbs (curb)
Yamaha TTR-5021.9 in51.4 in23.4 in126 lbs (wet)
Honda CRF125F29.1 in69.7 in29.1 in 194 lbs (curb)
Suzuki DR-Z7022.0 in52.0 in22.8 in121 lbs (curb)
Kawasaki KLX14030.7 in71.7 in31.1 in205.0 lbs (curb)
KTM 65 SX29.5 in116.5 lbs
Yamaha TT-R110E26.4 in61.6 in26.8 in159 lbs (wet)

What to really consider when buying a dirt bike:

There are lots of aspects to dirt bikes and plenty of cool gadgets and styles, but there are a few major components that I would pay close attention to when considering whether or not you’ve found the bike for you.

One Size Doesn’t Always Fit All:

Whether it’s you or your kid, it’s important to go try out the bike; even sitting on it and taking it for a ride would be beneficial.

Why? To see if it’s the right fit for you. Generally speaking, it’s suggested that you make sure your feet can touch the ground while you’re static. I would suggest that you also make sure you’re not too scrunched up on the bike when your legs are up though. Otherwise, the bike might just be too small for you which leads to uncomfortable riding.

New or Used:

New Bikes:

If you’re considering buying a brand new bike, here’s my advice. Like cars, I wouldn’t choose the brand-spanking new bike that was just released. My reason being that normally manufacturers are still working out any kinks that come up.

If you’re still looking into buying a new bike, I would suggest you buy one that has been out for a year or two. It’s more certain that these bikes have been adjusted and had the kinks smoothed out since they were first released.

Used Bikes:

Although it’s always good practice to go check out the bike before you make the purchase, I highly advise you do so when considering buying a used bike.

The major factors that you’ll want to consider when looking into the dirt bike is the wear and tear on the bike’s pipes, cases, kick-start, and frame, and it’s overall running function. The video below gives some awesome advice on what you might come across in particular.

The Bike’s Reviews:

Whether you are buying a new dirt bike or a used one, it’s always a good idea study up on the reviews that people have left about the particular model you’re thinking of making your own to see what experiences (good and bad) other dirt bikers have had with it.

For example, the FX5 Mountain Moto is considered the lightest dirt bike on the market (132-136 lbs depending on model). While some reviewers have said the bike is awesome due to it’s light weight and ability to go into territory that bigger bikes can’t go, others have said it’s not a bike that they would take on a long ride and that it’s 125cc engine doesn’t go as fast as other bikes.

It’s all about experience, comfort, and personal preference:

If you’re a new rider, returning rider or a more experienced rider, the bike that you find best for you will likely not be the same as another rider’s dirt bike. But when you’re deciding on what dirt bike to purchase, There are three things to consider: experience, comfort, and personal preference.


If you’re a beginner, the lighter the dirt bike and the lower the cubic centimeters (cc) of the engine, the better. Bikes with these qualifications are easier to control while you’re learning to ride and getting used to the feel of riding on rough terrain.


Bike size ranges that I would suggest for beginners are in the 125cc and 150cc range. But if you have a bit more experience and you’re a heavier rider, I’d suggest a 250cc bike being the right fit for you. Just recognize it will have more power and speed than a 125cc or 150cc.

Here are some great bikes for beginners: the Yamaha YZ125 and the KTM 250 EXC.

For kids, ages 6-12, who are starting out on their first dirt biking experiences, I suggest dirt bikes with engine ranges between 50cc and 100cc depending on their size, age, and skill. As they get older and more experienced, it’s totally appropriate to upgrade to a 125cc bike at your discretion.

Here are some kid dirt bikes that come with excellent recommendations for kids: the Honda CRF80F and the KTM Mini Adventure

More Experienced:

If you’re a more experienced dirt bike rider, you’ll likely do just fine on a 250cc or higher dirt bike. These machines will be faster and harder to control, but you should be pretty capable to control them.

Of course, even if you can handle a bike with a higher cubic centimeter engine, I highly suggest you still make sure the bike isn’t too big or too heavy for your weight. Likewise, you’re going to want to make sure that the bike isn’t too small or too light to carry you where you want to go on your adventures.

There’s nothing worse than being on a bike that doesn’t have the power to carry you up to a hill so you painfully make your way up at a slow speed.

The Honda CRF250X and the Yamaha YZ250FX are both great bikes with lots of power that come up with top reviews above other bikes that I have seen.

Also, if you’re looking for a really powerful machine or one that can support more weight, the Kawasaki KX500 and the Suzuki DR-Z400S are both great dirt bikes that fit those higher criteria.


Comfort is a major factor for adults and kids alike, and making sure that your bike is the right size for you is crucial to your comfort. Can you imagine riding for three or four hours on a dirt bike that was too small for you? Or even a dirt bike that was too big for you? I know my nerves would be frazzled by the end of that riding trip.

Personal Preference:

Of course, all of this comes down to your personal preference. I’ve talked all about the averages of dirt bikes, but if your shorter, taller, bigger, smaller, you might find it more comfortable to ride a different sized bike.

For example, my brother, who’s 6’4″ would not be caught on a dirt bike with a seat height of 36 inches. It just wouldn’t happen. Everyone’s a little different; men, women and children. Don’t be afraid to go out there and try out some of your friends’ bikes or take a test run. It will be worth it in the end if you find the right size dirt bike for you.

Jim Harmer

I'm the co-owner of Dirt Bike Planet. I live in Star, Idaho and enjoy dirt biking with my wife and two boys throughout the Idaho mountains.

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