Richtige Fahrradhelm Größe finden – so sitzt dein Helm perfekt

Find the right bicycle helmet size – this is how your helmet fits perfectly

Place the tape measure 2.5 cm above the eyebrows, measure the head circumference at the widest point, compare with the size chart. In 3 steps you will find the perfect helmet size for you and your kids.

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When you're on a bike, a helmet is essential, we all already know that. But did you know that a poorly fitting helmet cannot protect you optimally - or in the worst case, not at all? Therefore, the right size and the perfect fit are essential for a bicycle helmet. But how do you find the right size for your bicycle helmet? How do you adjust your helmet correctly and when does it become too tight? We'll show you how to find the perfect fit so you can ride safely and comfortably.

Why the right helmet size is crucial

Choosing the right helmet size is not only a question of comfort, but also of your safety. A bicycle helmet only fulfills its protective function if it fits correctly. A helmet that is too large can slip in the event of a fall and not adequately protect your head. Conversely, a helmet that is too small can be uncomfortable and, in the worst case, prevent you from wearing it. The right size ensures that the helmet fits snugly without being uncomfortable and provides you with optimal protection in the event of an accident.

How do you measure the head circumference for your helmet?

To find the right size for your helmet, you must first measure your head circumference. To do this you will need a flexible tape measure or string and a ruler. Wrap the tape measure around your head about 1 inch above your eyebrows and make sure it fits across the widest part of your skull. Write down the circumference in centimeters. At this point, we recommend that you carry out the measurement several times to ensure that you get an accurate result. Make sure the tape measure is neither too loose nor too tight; it should fit comfortably without causing pressure points.



All of ours Helmets have a closure system, with which you can adjust your helmet. Therefore, when choosing your helmet, you can choose a size that is up to one centimeter larger than your dimensions. 

Bicycle helmet size charts

Once you have measured your head circumference, you can determine the appropriate size using the helmet size chart. These tables vary depending on the model. We offer different sizes for each helmet so you can find a helmet that fits your head perfectly. Thanks to our closure system, adjusting the helmet is child's play!


We would be happy to show you the sizes using an example. With ours Pedalon you can choose between three different sizes. 


Head circumference in centimeters 

size

53-56 

S

56-59

M

59-63

L

The right size for children's helmets

When choosing a children's helmet, it is particularly important to choose the right size, as children's heads grow quickly. Make sure the helmet fits well and is not too loose. The wrong size can not only be uncomfortable, but it can also endanger your child's safety. 


To determine the helmet size for children, you should, as explained above, measure your child's head circumference and use the corresponding size charts on ours Children's helmets compare. 


Below you will find a size chart for the Children's bicycle helmet Meggy II Trend 2024


Head circumference in centimeters 

size

44-49

XS

46-51

S

49-53

S/M

52-58

M

If you are currently still looking for something suitable Children's bike accessories If you're looking for something, just browse through ours Accessories department

Adjusting your bicycle helmet 

Since the KED helmets are equipped with a practical closure system, adjusting your helmet is very easy. You can quickly and easily adjust the helmet either tighter or looser in no time using the dial. If you have one of our innovative K-Star Pure-Helmets If you choose, you even benefit from it K-FIT Adjustment system. This system ensures even faster and precise adjustment of your helmet!

Conclusion: Determine the size of your bicycle helmet – comfortable, firm and safe 

The right helmet size is crucial for your safety and comfort while cycling. By accurately measuring your head circumference and following the size charts of each KED models By taking this into account, you can ensure you find the perfect helmet. Your head deserves only the best! 

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No tape measure to hand?

Did you know? A non stretch piece of string works too: place it around the head 2.5 cm above the eyebrows, mark where it overlaps and measure the length with a ruler or folding rule. That gives you the head circumference.

Frequently asked questions about the topic

How do I measure my head circumference for a bicycle helmet?

In three steps: place a flexible tape measure horizontally around the head about 2.5 cm above your eyebrows. Run it over the widest point at the back of the head and read the value in centimetres. Repeat the measurement 2 to 3 times for an accurate result.

Which bicycle helmet size do I need with a head circumference of 57 cm?

That depends on the model. On the KED Pedalon, 57 cm corresponds to size M (56 to 59 cm). With other makers or models the mapping can differ, so always check the model specific size chart.

What do I do if my head circumference falls between two helmet sizes?

Choose the larger size. With the fit system, at KED the K-FIT system, you can tighten the helmet by up to 1 cm and achieve a safe, comfortable fit.

How do I find the right bicycle helmet size for my child?

Measure your child's head circumference with the same method as for adults (tape measure 2.5 cm above the eyebrows). Compare the value with the kids size chart. Never buy a helmet that is too big for your child to „grow into“, that is dangerous.

How tightly should a bicycle helmet fit?

Firmly, but without pressure points. The helmet sits two fingers above the eyebrows, must not slip when the head is shaken, and exactly one finger fits between the chin strap and the chin. After five minutes of wear, no spot should press uncomfortably.

Are bicycle helmet sizes the same across all makers?

No. The letter sizes S, M and L are not standardised and vary by maker and model. Always measure your head circumference and use the maker's own size chart.

Does head shape affect the choice of helmet size?

Yes. Oval and round head shapes can fit the same helmet differently even with an identical circumference. Put the helmet on and check after five minutes whether pressure points appear. If they do, try another model.

Melissa

Melissa writes about bicycle helmets, cycling and road safety. With a clear eye for trends and consumer issues, she prepares specialist knowledge in such a way that it is easy for readers to understand and use immediately.