Average Length of a Dirt Bike – Dirt Bikes Size for Adults & Kids

Written by

James Stevens

Fact-checked by

Robert A. Verdin

average length of a dirt bike

Before heading to the shop, finding out the right dirt bike length for you is essential because it determines your comfort and safety while riding. In general, the average length of a dirt bike for adults and kids bikes is 85.7 inches and 56 inches, respectively.

To know more about the different sizes of dirt bikes or their dimensions, continue reading this article!

Average Dirt Bike Length


The length of a dirt bike, which is measured from the front tire tread to the back tire tread, should be taken into consideration when you’re looking for a dirt bike to ride. Having the correct length will ensure your comfort and safety while riding your bike.

On average, an adult dirt bike is 85.7 inches long. However, depending on the brand/model of your motorcycle, the dirt bike length varies.

For instance, Suzuki, Yamaha, Kawasaki, and Honda dirt bikes don’t have the same lengths. Please check the chart below for the examples:

Brand (Adult’s Dirt Bikes) Length
Honda CRF250F 83.0 inches (210.82 cm)
Kawasaki KLX 110L 61.4 inches (155.956 cm)
Honda CRF450R 85.9 inches (218.186 cm)
Kawasaki KX250F 85.5 inches (217.17 cm)
Yamaha YZ125 84.1 inches (213.614 cm)
Brand (Kid’s Dirt Bikes) Length
Apollo Dirt Bike 125cc 52.0 inches (132.08 cm)
Honda CRF50F 51.3 inches (130.302 cm)
Yamaha PW50 49 inches (124.46 cm)
Suzuki DR-Z50 52.0 inches (132.08 cm)
Yamaha TTR50E 51.4 inches (130.556 cm)

To know if you have the right dirt bike length, you need to consider the following:

  • When driving, if you feel like you can easily hold the handlebar, the length of the dirt bike should be just right for you.
  • Maneuvering the handlebar of your dirt bike shouldn’t be challenging as well. If you’re able to steer your dirt bike without straining your back and arms, you have the proper dirt bike length.
  • Lastly, the distance between the seat and the handlebar should be according to your preference. If you’re comfortable and content driving your dirt bike, its length should be perfect.

In case you don’t have the proper dirt bike length according to your liking, you can adjust your wheelbase to achieve your desired dirt bike length.

Other Dimensions of a Dirt Bike

When buying a dirt bike, your manufacturer can offer you the best dirt bike size calculator. They may need to consider many things, such as your height, weight, and age, to determine the appropriate size for you.

Here’s the dimension of the average-sized dirt bike aside from length:

Seat Height 37.0 inches
Width 32.4 inches
Weight 252.0 lbs.

1. Seat height


The seat height will depend on the kind of dirt bike you have, such as competition, recreational, or kids’ bikes. For example, the average seat height for competition dirt bikes is 37.6 inches, as it needs a long-travel suspension.

In addition, your height is a major factor when selecting your dirt bike’s seat height. Selecting the proper height will allow you to easily get on and off your bike.

The chart below will guide you when choosing the best dirt bike sizes for adults.

Height Seat Height Recommended Dirt Bike Sizes
6′ (182cm) 37.5″ (95.25 cm) 450cc
5’10” (178cm) 35 to 39″ (88.9-99.06 cm) 250cc
5’8″ (172cm) 34 to 38″ (86.36-96.52 cm) 125/150cc
5′ 6″ (167cm) 34 to 37″ (86.36-93.98 cm) 140/150cc
5’4″ (162cm) 33 to 36″ (83.82-91.44 cm) 140cc
5’2″ (157cm) 31 to 35″ (78.74-88.9 cm) 125cc

However, it’s important to consider that different manufacturers have different average seat heights for the same engine size. For instance, a Honda CRF125F (30.9″) won’t have the same seat height as KTM 125 SX 2020 (37.4″).

Depending on how tall your bike is, you may need a customized dirt bike stand when servicing your motorcycle. The average dirt bike stand dimensions are around 16-1/2″.

2. Width


The width of your dirt bike has an impact on its bulkiness and aerodynamics. For adults, the average width of a dirt bike is 32.4 inches, while it’s 25.7 inches for kids’ dirt bikes.

Choosing the width of a dirt bike is usually a matter of personal preference. However, the wider the bike is, the heavier it may also get.

3. Weight


Weight is another important factor for a dirt bike, as it influences the dirt bike’s speed and control. The average adult dirt bike weighs around 252.0 lbs., while it is around 137.5 lbs. for kids.

Generally, a dirt bike’s weight may depend on the type of bike you have and its engine size. For example, a 150cc dirt bike, like Yamaha PW50, weighs around 90 lbs.

In addition, the type of engine on your dirt bike also affects the overall weight of your motorcycle. Thus, 4-stroke dirt bike sizes may be heavier than your average bike due to its larger engine; for instance, an adult 250cc 4-stroke is around  240 lbs.

Factors That Affect the Length of a Dirt Bike


There are different factors that affect a dirt bike’s length and size in general. For instance, your age, height, and weight are all contributing aspects.

1. Will age affect dirt bike length?

When choosing a dirt bike, it’s best to consider the rider’s age. Given that younger riders are not tall, their bike’s length is also shorter to allow them to reach the handlebars easily. For kids, the average dirt bike length is 52.9 inches.

Generally, as a young rider grows up, the dirt bike’s height and length will also increase, along with the engine size. You may check the size chart below to determine the right dirt bike for your kid.

Age Height Bike Height CC
3-7 y/o 2ft 7in – 3ft 7in (78.74-109.22 cm) 17 – 21 inches (43.18-53.34 cm) 50cc
7-12 y/o 3ft 7in – 4ft 7in (109.22-139.7 cm) 21 – 25 inches (53.34-63.5 cm) 50cc – 110cc
12-14 y/o 5ft – 5ft 2 in (152.4-157.48 cm) 31 – 35 inches (78.74-88.9 cm) 125cc
14-16 y/o 5ft 2 in – 5ft 8 in (157.48-172.72 cm) 35 – 38 inches (88.9 cm-96.52 cm) 125cc – 250cc

2. Does height impact a dirt bike’s length?

Generally speaking, if you’re tall, your dirt bike should also be longer to allow you to comfortably extend your arms to reach the handlebars. You may ask your dealer for assistance to ensure you have the right length.

3. Does my weight affect dirt bike length?

Aside from impacting the bike size, your weight may also affect the length of your dirt bike. For instance, if you’re on the heavier side, your dirt bike must be longer and in turn bigger to accommodate your build and weight.

Frequently Asked Questions


How long is a full-size dirt bike?

A full-size dirt bike or the average dirt bike length for adults is 85.7 inches.

What’s the best dirt bike for beginners?

Again, choosing a dirt bike depends on a lot of things such as your skill level, height, weight, or age. For example, a 125cc dirt bike is perfect for adults who are trying to get into racing and who are on the shorter side.

Meanwhile, a 250cc dirt bike is ideal if you’re a bigger rider and has little experience.

I’m heavy. What dirt bike size is best for me?

Choosing the right size based on your weight prevents the suspension from being damaged and ensures you’re safe while using the dirt bike. The rule of thumb is to choose a bigger bike if you’re heavy.

For instance, for a 200-pound man, the recommended engine size is 250cc to 450cc. Nevertheless, you also need to assess your skill level and experience to ensure you can handle the dirt bike’s power.

How big is a 125cc dirt bike?

A 125cc 4-stroke is around 198 lbs. With an average of 31 – 35 inches seat height, a 125cc dirt bike is recommended for anyone who’s around 5ft to 5ft 2 inches tall.

What dirt bike length fits a truck bed?

It’s important to consider the length of your dirt bike when strapping it down onto a truck bed for transport. Thus, make sure the dirt bike length fits your truck bed to be able to close the tailgate.

For reference, if your dirt bike has the average motorcycle length or more, it may not fit on a short bed truck, as it’s only around 72-82”.


Choosing the size of your dirt bike depends on a lot of factors. Your age, height, weight, and skill level should be taken into consideration to ensure you’re safe and comfortable while riding your motorcycle.

In general, the average length of a dirt bike for adults is 85.7 inches and 56 inches for kids. By choosing the correct length, along with the right seat height, weight, and width, you’ll have fun riding your dirt bike

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James Stevens

James Stevens is an expert bike mechanic who knows everything from basic repairs to custom modifications. What sets him apart is his ability to explain complex concepts in a way that's easy to understand. Check out his content on Speedway if you need help with upgrades or modifications for your bike.