Dirt bikes weigh less than any other type of motorcycle thanks to small frames, light aluminum components, and no dash, lights, indicators, or side stands.
The average dirt bike weighs 203 lbs (92 kg) which is less than the smallest and lightest street bike. The Kawasaki KLX 300 R trail bike is the heaviest dirt bike at 282 lbs (128 kg), while the Yamaha PW 50 is the lightest dirt bike at only 90 lbs (41 kg). Trail bikes weigh more than race bikes, and 4-stroke dirt bikes weigh more than 2-strokes.
If you are unsure which dirt bike is right for you, the best way to get a feel for the bike’s weight is to take it for a test ride. If that is not possible, at least try to sit on each bike on your shortlist. To help you narrow down your search for the perfect dirt bike, I’ve sorted all the major dirt bike models according to their wet (curb) weight in pounds and in kilograms.
Complete List of Dirt Bike Weight (in lbs and kg)
For a complete list of dirt bike weights I’ve included a table below which includes engine capacity and weight in pounds (lbs) and in kilograms (kg). For a similar comprehensive list on dirt bike seat heights vs engine size, check out this post.
|Kawasaki KLX230R S||230||115||254|
|Kawasaki KX450 X||250||112||246|
|Yamaha YZ450F MONSTER ENERGY YAMAHA RACING EDITION||450||111||245|
|Kawasaki KX450 SR||450||110||243|
|Kawasaki KX250 X||250||109||240|
|KTM 250 SX-F Troy Lee Designs*||250||109||240|
|KTM 450 SX-F*||450||108||239|
|Gas Gas MC450F*||450||107||237|
|KTM 350 SX-F*||350||107||236|
|Gas Gas MC350F*||350||107||236|
|KTM 250 SX-F*||250||107||235|
|Gas Gas MC250F*||250||106||235|
|Yamaha YZ250F MONSTER ENERGY YAMAHA RACING EDITION||250||106||234|
|Gas Gas MC250*||250||103||228|
|KTM 250 SX*||250||103||228|
|Yamaha YZ250 MONSTER ENERGY YAMAHA RACING EDITION||250||103||227|
|Kawasaki KLX140R F||140||99||218|
|Kawasaki KLX140R L||140||95||209|
|KTM 150 SX*||150||95||209|
|KTM 125 SX*||150||95||209|
|Gas Gas MC125*||125||95||209|
|Yamaha YZ125 MONSTER ENERGY YAMAHA RACING EDITION||125||95||209|
|Honda CRF125F BIG WHEEL||125||90||199|
|Kawasaki KLX110R L||110||76||168|
|Husqvarna TC85 (19/16)*||85||73||162|
|Gas Gas MC85 19/16*||85||73||162|
|KTM 85 SX 19/16*||85||73||162|
|Gas Gas MC85 17/14*||85||72||159|
|KTM 85 SX 17/14*||85||72||159|
|Gas Gas MC65*||65||57||125|
|KTM 65 SX*||65||57||125|
|Gas Gas MC50*||50||44||97|
|KTM 50 SX*||50||44||97|
|KTM 50 SX Mini*||50||43||94|
The table above shows the engine size in cc so that you can compare the weights of similar sized dirt bikes. Some manufacturers’ bikes are lighter than others. I’ve quoted curb (wet) weights in the table which is how all the Japanese manufacturers list the weights on their websites.
The European manufacturers, KTM, Husqvarna and Gas Gas (indicated with an * next to the bike model), shows dry weight on their sites. As a result, I had to estimate the curb weight to keep it comparable by looking up the fuel tank, engine oil and coolant capacity, and then multiplying each by the weight of the relevant fluids.
Weights of Different Types of Dirt Bikes
While all types are dirt bikes weigh very little compared to other types of motorcycles, there are differences in the weights of different types of dirt bikes.
Dirt Bike Weight: Motocross (Race) vs Trail (Cross Country) Bikes
A motocross (or race/competition) bike and a trail bike from the same manufacturer will look identical to the untrained eye. Even though a motocross and a trail bike shares most of the same parts, they are designed with two very different styles of riding in mind.
A trail bike is designed to be more comfortable on longer rides on mountain or forest single tracks. Therefore, they have softer suspension and possibly a wide-ratio gearbox. A motocross bike needs to be fast around a race track, be able to soak up massive jumps without bottoming out, and accelerate quickly out of turns. Motocross bikes also have lower gearing with ratios that are closer together.
As a result of the different demands placed on motocross bikes compared to trailbikes, motocross bikes tend to be lighter than comparable trail bikes. The addition of a kickstand, headlight, and maybe an electric starter will make a trail bike heavier than a race bike.
As an example, the Honda CRF 450 R motocross bike weighs 244 lbs (111 kg) compared to 275 lbs (125 kg) for the Honda CRF 450 X trail bike. Side-by-side it is hard to tell them apart.
At 243 lbs (110 kg) the Kawasaki KX 450 competition bike weighs 45 lbs less than the Kawasaki KLX 300 R trail bike that weighs 282 lbs (128 kg), despite the 450 having a much larger engine.
Dirt Bike Weight: 2-Stroke vs 4-Stroke
A 2-stroke dirt bike generally weighs a bit less than a similar-sized 4-stroke dirt bike. This is thanks to a 2-stroke engine having less moving parts that add weight. There are no valves, rockers, camshafts, and cam chains in a 2-stroke engine. For an in-depth look at the difference between 2-stroke and 4-stroke dirt-bikes, check out this post I wrote.
Apart from the engine, there are no differences between a 2-stroke and a 4-stroke motorcycle. To give you an idea of the weight difference, the Yamaha YZ 250 2-stroke dirt bike weighs 227 lbs (103 kg) compared to the Yamaha YZ 250 F 4-stroke that weighs 234 lbs (106 kg). Both are motocross bikes.
Dirt Bike Weight vs Engine Size
One of the heaviest components on a dirt bike is the engine. As a result, dirt bikes with larger capacity engines will weigh more than their smaller siblings. The Yamaha YZ 125 is identical in size to the Yamaha YZ 250. In fact, the Yamaha YZ 125 has a slightly taller seat height (see my post of dirt bike seat heights here). Yet, the YZ 250 weighs 227 lbs (103 kg) which is nearly 18 lbs heavier than the YZ 125’s 209 lbs (95 kg). This is solely thanks to the 250’s larger motor.
To put things into context, the average weight of all 50, 65, 85, 125 and 250 cc 2-strokes dirt bikes, and 250 and 450 cc 4-strokes are shown in the table below.
|Dirt Bike (by engine)||Average Weight (lbs)||Average Weight (kg)|
|450 cc 4-stroke||249||113|
|250 cc 4-stroke||239||108|
|250 cc 2-stroke||228||103|
|125 cc 2-stroke||209||95|
|85 cc 2-stroke||162||73|
|65 cc 2-stroke||128||58|
|50 cc 2-stroke||104||47|
If you are unsure which dirt bike is best for you, please take note that there is more to it than the weight of the bike. To help you choose the right dirt bike for your experience level, build and intended use, check out this detailed post I wrote.
Why are Dirt Bikes so Light?
Dirt bikes are designed to go fast over rough terrain, be it a motocross track with huge jumps and whoops, or a forest single track littered with rocks and tree roots. To keep the weigh down, dirt bikes have very little accessories like lights, instruments, or kick-stands. Some dirt bikes don’t even have electric starters.
Another design feature to assist dirt bikes in off road riding and rough terrain is the long-travel suspension and big wheels. This increases a dirt bike’s ground clearance, but also raises the seat height (see more on dirt bike seat height here). Shorter riders often have trouble touching the ground with both feet on a dirt bike, but the light weight makes it easier to keep the bike upright.
And when you drop your dirt bike, which is not uncommon (even for experienced riders), you’ll be glad that it weighs much less than a similar-sized street bike.
How Can I Make My Dirt Bike Lighter?
While dirt bikes are generally very light already, there are a couple of things you can do to shed even more weight on your dirt bike.
The biggest weight saving that can be had is by replacing the factory exhaust with a lighter, aluminum or titanium exhaust. An aftermarket titanium exhaust can shave off more than a pound and increase the power and torque slightly. A free flowing aftermarket pipe will also eliminate the spark arrestor found in trail bikes. Just make sure it is legal to ride without a spark arrestor in your area.
Another weight saving modification is to replace your lead acid battery (if your bike has an electric starter) with a lithium battery. Lithium batteries, like this YTX-14 BS from Amazon, might be expensive, but they are smaller, much lighter and can hold a charge over winter without requiring a battery charger being hooked up.
Other weight saving tips include titanium bolt kits, lighter hubs (expensive and hard to find), and replacement race plastics. These are great ways to throw away money. Personally, I’d just replace the pipe and battery, and then eat less pork pies and cake. It is cheaper, healthier, and way more effective to go on a diet than to replace 1 oz parts here and there.
Dirt bikes are significantly lighter than any other type of bike. As a result, the weight of the bike should hardly be a deciding factor if you choose between different brands of dirt bikes. Make sure you consider your intended use and pick the bike with the right seat height, engine size and type (2-stroke vs 4-stroke), and suspension setup (race vs trail). Oh, and the one that looks coolest to you!