Mountain biking and motocross racing are similar in many ways. They both involve riding a motorcycle off-road, and the gear you wear is quite similar too. But there are important differences that make them not interchangeable for each other.

For one thing, motocross helmets have different ventilation systems than mountain bike helmets because they’re designed to pull air over your head rather than through it like with mountain bike helmets. So if you want to use a motocross helmet for mountain biking, you may find yourself reaching for the drink bottle more often because of how hot it will make you feel.

Key Differences between Mountain bike and motocross helmets:

A mountain bike helmet is better suited for use on paved roads and trails with fewer bumps and turns, while a motocross helmet can be used in more extreme conditions such as desert racing or riding over downed trees and logs on forest trails.


Motocross and mountain bike helmets are both designed to protect a rider’s head from injury during the course of their sport. 

However, motocross helmets provide more protection than mountain bike helmets because they have more space for padding in the front and back to absorb energy. Mountain bike riders will typically wear a helmet with less padding in order to maintain better balance on their bikes.

Motocross helmets also have a visor to protect riders from flying debris, mud and bugs when riding off-road. A mountain bike helmet typically does not include this feature.

It is important to protect your head when mountain biking because there is always a risk that you’ll fall and if you do, it’s best to be as protected as possible. So while motocross helmets are great for invigorating off-road racing, they may not be the best option for long leisurely rides through wooded trails.


Mountain bike helmets pull air through the helmet to keep you cool. Despite a motorcycle helmet’s lack of holes, a well-made motocross helmet can actually ventilate very well when traveling at high speeds.

Riding a mountain bike with your motorcycle helmet on feels like wearing a brick. The giant weight of the bulky object makes you believe that almost no air is coming through, if at all.

But if you were on a motorcycle wearing the motocross helmet, it might feel like such an afterthought that you’d forget about it entirely. The wind flowing over your head as you speed down the highway would be so freeing and luxurious, too.


To summarize, a traditional mountain bike helmet weighs 12 ounces while an average motorcycle helmet weighs 3.5 pounds. That’s about 4.5 times more!

The weight of a motocross helmet is about 20-22% more than that of a mountain bike helmet.

It’s because the motocross helmet needs to provide more protection for the head and neck, which require thicker foam padding. The extra weight also makes it easier for riders to hang on when they crash at high speeds. Meanwhile, since mountain bikers are often riding on uneven terrain or even jumping off cliffs, they need their helmets to be lighter so they can react quickly without getting weighed down by their gear. One way manufacturers achieve this is by using thinner materials in the construction of the shell and then adding extra-thick foam pads inside.

Can you use a motocross helmet on a mountain bike?

Some people think motocross helmets can be used on a mountain bike.

Motocross helmets were designed to protect the head while racing, not rocks and other obstacles while biking. The shape of the helmet is also different because it must fit tightly around the rider’s neck so that it doesn’t come off in a crash. 

In addition, many motocross helmets do not have openings for ventilation, since they are intended to be used only for short durations.

These factors make using a motocross helmet on a mountain bike dangerous. There are helmets designed specifically for mountain biking that offer better ventilation and lighter weight, making them safer for mountain biking.

Can you use a mountain bike helmet on a motocross bike?

Do you want to know if a mountain bike helmet will work on a motocross bike?

The answer is no. The two bikes are completely different, with very different needs. A mountain bike helmet is designed for the more leisurely sport of mountain biking, whereas a motocross one has to be able to withstand much rougher terrain and higher speeds. It’s also important that both helmets fit well, since if they don’t, they won’t offer the protection needed in case of an accident.

Can you use a motocross helmet for downhill mountain biking?

The answer then is no – a motocross helmet will not offer adequate protection when mountain biking because they do not have the capabilities to absorb impacts which is extremely important in downhill mountain biking. Helmets that are designed for this sport need to be able to reduce your speed through a variety of ways such as by having channels cut into the helmet or having vents and void spaces inside it. 

Can You Use a Dirt Bike Helmet for Mountain Biking?

The two helmets, dirt bike and mountain biking, do not serve the same purpose and should not be used interchangeably. A dirt bike helmet is designed to protect your head from stones, trees and branches that might fly up as you ride along or as you jump roosts or obstacles on a motocross track.

When you’re in a pinch, any helmet is better than no helmet at all. Motocross helmets and full-face mountain bike helmets are very similar; they both have large openings for goggles and airflow to prevent suffocation from dirt or dust inhalation during use.

Final Thoughts:

It is important to select a helmet that fits your head well. If you choose one that isn’t made for the activity or purpose, it may not protect you as much and could cause discomfort while riding.

To find out which helmet design will work best, do research on your ideal helmet and talk to experts at a local motorcycle dealership.