When choosing a mountain bike helmet, your head measurement must match snugly with the dimensions on the sizing chart of your chosen helmet. When finding the correct solution how to measure for mountain bike helmet, it is also essential to consider how much peripheral vision you will have in the new helmet. A good mountain bike helmet should seal 100% against your face but still allow for adequate breathing (e.g., air intake).
A helmet that fits well will also help to protect you from external trauma (such as a fall) or internal trauma (such as an impact from the head hitting a tree or ground) during a crash. As with bike fit, a good fit will also help you to stay safer, more comfortable, and more efficient when riding your mountain bike.
Considerations when choosing a mountain bike helmet:
Your head shape should be considered with this measurement because your head is not uniform in terms of circumference and thickness across the circumference. Your measurements can be used to help select the right size for you. Let’s look at each measurement:
1. The circumference (C) of your head is measured at the largest point on your head, usually located around the ears or on top of your head (for example, these are called “dynamic” measurements).
2. Your head’s frontal circumference (A) is measured from front to back, just above the brow line. If a helmet tilts down or away from your forehead, this measurement can increase by as much as 1-2cm (0.5-1 inch).
3. The head’s side circumference (B) is measured on your head’s right and left sides at the pointy part of the ear and pointy part of the jawbone. There are different ways to measure these; we will discuss some tips in our measuring section below!
4. The cheek area is measured around the forehead and on top of the ear.
5. The temple (C) is measured from the center of one ear to the center of the other, just below the eyebrows and above your hairline.
Now that we are aware of some basic head measurements, let’s look at some tips on how to find your measurements:
Read below to determine if you have a small, medium, or large size head!
If you fall into a “medium” category, then you may be having trouble finding a helmet that fits properly because helmets in this range are not designed for all sizes of heads. The helmet should be snug but not squeeze your head uncomfortably. Your helmet should fit high on your forehead and just above your eyebrows. It should have even pressure across the entire helmet.
An excellent way to check for the correct helmet size is by using a “pinch test” to squeeze the helmet with two fingers. If your head feels pinched or compressed, you need to find a bigger size. Another way to tell if your head is too big/small is to see how much room there is between your chin and the top of the helmet lining.
A good indication is if the space between your chin and the top of the helmet liner is 1 inch. To check, grab a piece of paper (or a flat cardboard ruler) and fold it in half to make two big rectangles with your head as one rectangle. For example, you may have 2 inches of space between your chin and the top of the helmet liner. You need to get a larger size if there is less than an inch.
A good measurement is to take measurements from the top of the helmet lining. There are two essential measurements we will be discussing:
1. The brow width is measured from one vertical line above the top of the helmet liner to another vertical line below it. This measurement should be about 1-2mm (0.5-1 inch).
2. The forehead width is measured on your forehead where two lines are drawn perpendicular to the outer edge of your helmet and extending back on each side of your head. This measurement should be at least 1 inch (e.g., 2 inches, 3 inches, etc.).
If you have a round face shape or a large forehead, you should pay attention to these measurements. You may have to get a more comprehensive helmet or choose a helmet with more room in the front. You do not want to pinch your temples or cheeks! The correct helmet can also make you feel safe and look great (check out our digital catalog for some awesome designs).
You should measure both sides of your head to ensure accurate results. Using these tools is also easier and faster than measuring with paper and pencil alone. There are several different types of measurement tools that can be used. However, they all work the same way: measuring a portion of your head and then adjusting the helmet to ensure it is snug and comfortable.
Demonstration of how a helmet should fit:
1. Adjust the eyelets to have a snug fit around your head. This works best with a hat underneath the helmet. (Figs 13 and 14).
2. Make sure that there is no gap between the inside of the helmet and your ear (Fig 15)
3. Make sure there is no gap between the inside of the helmet and your jaw (Fig 16). It should make contact with your lower jaw! If you feel your chin pushing against the bottom of the helmet – this will make you ride more safely 🙂
4. Make sure it is not too tight around your ears (Fig 17). This is the point that you want to be able to pull off your helmet and remove any road dirt before you take a look at it with the other riders.
5. Make sure the helmet fits nicely on your head (Fig 18). If there are any gaps between the helmet and your head, it will be uncomfortable when you ride. And if there are problems, you can adjust the helmet back up to fit perfectly.
6. Try on the helmet with a hat underneath for a snugger fit (Figs 19 & 20).
7. Verify that the helmet fits fine with no gaps between the helmet and ear and chin strap. (Figs 21 & 22)
8. Ensure no air is escaping from the ear vents (Fig 23). This will help keep you cool, especially in summer or if you sweat a lot because it lets air through your head and some of the external heat out. Some helmets have an extra ventilation system. There is little to be lost by installing these.
9. Look how well the helmet fits all your gear (ex: neck brace, glasses, etc. Fig 24).
One of the best ways to avoid unnecessary risks while riding is to prepare yourself and your bike. Fortunately, proper gear and riding technique will help you minimize crash injury and protect you when mountain biking. Always wear a helmet and ensure it fits correctly, has not been damaged (after a fall or crushed), and has the correct chinstrap seal. If your helmet is damaged, throw it away! If your helmet has no cracks or problems but still feels it doesn’t fit right, throw it away! No exceptions!! You will not ride safely if you do not wear your safety gear correctly.
How do I know my helmet size?
In order to how to measure for mountain bike helmet the right size, you need to know how to measure your head. The good thing is that it is not difficult to do this.
First, you must ensure that your hair is pulled back and out of the way. Next, find a ruler or measuring tape and wrap it around your head above your eyebrows. Measure the circumference in inches and add 2 inches for comfort. This will be the size of your helmet.
What size helmet do I need for a 26-inch head?
When measuring your head, you’ll also want to consider your forehead and ear size. If you have a round or oval-shaped head, the measurement for a helmet should be taken from the middle of one ear to another.
A medium-sized helmet is recommended if your head is less than 26 inches in circumference.
What size helmet is 22 inches?
Helmets are made in different sizes, but the most common size is 22 inches.
The size of a mountain bike helmet is measured in inches. A standard mountain bike helmet is 22 inches in diameter.
What size helmet is 21 inches?
A 21-inch helmet is the size of a standard football helmet. This size is also used for other sports, such as lacrosse, field hockey, and ice hockey.
The 21-inch helmet was designed to be comfortable for the wearer and provide a good fit. It has evolved to include more padding in the back of the head area, which can be adjusted with a dial on top of the helmet.
If you are unsure of your head measurement, it is best to go with the helmet that fits the largest size on the sizing chart. If you are still concerned about fit, try a few different helmets and see which one feels snugger without being too tight. Either way, always use a helmet when mountain biking to protect your head in case of an accident.