Size guide
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Designed and produced in combination with Italian motor helmet manufacturer AGV, this helmet will offers its wearer nothing but the best. The sporty look of Diesel’s Hi-Jack helmet is well balanced with the use of the latest technology and highest quality materials. The sky is the limit when wearing Diesel’s Hi-jack jet helmet.

Coming in 2 sizes, the outer shell of this Hi-Jack helmet weighs only 1100 grams. When you look at the inside of this helmet you will see that Diesel and AGV used Dri-Lex fabric for the inner liners of this helmet. This moisture and odor wicking liner received a sanitizing treatment, to prevent the growth of bacteria. With this liner being completely removable and washable, you’ll never have to worry about dirty padding anymore. When designing this helmet, Diesel sought inspiration in the aviation industry. This Hi-Jack helmet is based on helmets worn by helicopter pilots. The visor is scratch-proof and anti-fog, and provides protection against UV rays. This scratch-resistant visor can easily be removed thanks to AGV’s quick release visor system. If you are looking for a touring helmet and you consider purchasing a jet helmet, than Diesel’s Hi-Jack is an option to consider. The strong, homologated outer shell will keep you safe, while numerous of AGV’s features included in this helmet ensure maximum wearing comfort. The Hi-Jack is available in a wide variety of colors, so there is a Hi-Jack for everyone.

additional information

Brand Diesel
Is on Sale Yes
Helmet Series Hi-Jack
Homologation ECE 22.05
Helmet design Graphic
Paint finish Gloss
Black Friday No

size guide

CM 51-52 53-54 55-56 57-58 59-60 61-62
Inch 20-20.5 20.9-21.3 21.7-22 22.4-22.8 23.2-23.6 24-24.5


How do I measure my helmet size?

The circumference of your head provides a good guideline for the size you need for a helmet. Use a tape measure to measure the widest circumference of your head. For most people, this point is about an inch above your eyebrows, along the junction of your ear and over the lump on the back of your head. In the size chart you will find which size fits the circumference of your head in cm.

What are the different helmet fit

All heads are different and that is why manufacturers make different helmet shapes, this can be roughly categorized into three shapes: round, oval and round-oval.

  • Round: length and width of the head are almost the same;
  • Round-oval: the length of the head is slightly greater than the width;
  • Oval: the length of the head is significantly greater than the width.

Most motorcycle helmet manufacturers provide a predominantly round-oval fit so that they can appeal to the widest possible audience. Keep in mind that the fit of a helmet is very complex and difficult to describe exactly. Small differences may therefore also be possible within these three categories!

Are sizes the same for all brands?

In general, the helmet sizes and the corresponding number of cm do overlap. If your previous old AGV was size L, chances are you also need an L for your new Nolan. But as mentioned before, there can be small differences in fit per brand and even series. That is why it can happen that the cool new helmet you've been eyeing, even when you have measured yourself well, simply wont fit well.

How do I make sure the helmet I received actually is the right fit for me.

You can check the size and fit in the following ways:

  • Keep the helmet still and then try to tilt your head back into the helmet. If the helmet is too large (in the longitudinal direction), you will hit the inner shell with your nose without too much effort. Sliding a little bit is allowed, but this should only happen with the necessary resistance.
  • Keep the helmet still and turn your head from left to right. Again, a little sliding is allowed, but with resistance. If the helmet comes off the face completely at the temples, the helmet is too big.

A good "tight" fit is what you are looking for, after all, you don't want your helmet to suddenly start shifting while riding. If you think the helmet is too small, keep in mind that the inner lining hase to be worn in a bit, and the helmet will become a bit wider when used. The cheek pads in particular usually feel quite tight in the beginning but quickly become more comfortable. The best way to determine whether a helmet has a good tight fit or simply is to small, is to keep the helmet on at home for half an hour to an hour. If you don't start to suffer from a headache or get red pressure spots, Then it's all good!


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