The Electric Bike Buying Guide


A correctly fitting helmet is not only safer to wear, it’s more comfortable and will reduce the likelihood of headaches, excessive sweating or chafing against your skin.

Step 1: Measure your headBack to top

Bike helmet sizes are typically given as Small/Medium/Large, or in measurements of centimetres/inches. With a tape measure (you can download and print your own tape measure here), start approximately 1-2 finger-widths above your eyebrows and measure right around the back of your head at the widest part. Use the chart below to work out what helmet size is right for you:

Head size (centimetres) Head size (inches)
Small* 50 to 55 19 ¾ to 21 ½
Medium* 54 to 59 21 ½ to 23 ¼
Large* 58 to 63 23 ¼ to 25
*S/M/L equivalent sizes may vary slightly between manufacturers

2. Find a style and colour you likeBack to top

You might not think it matters, but it’s important to have a cycle helmet that you like the look of and you’re comfortable wearing. Bicycle helmets come in all sorts of shapes and sizes, and will vary depending on the type of cycling you do. For example, you don’t need a big heavy full-face helmet just for a quick ride to the shops and back.

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3. Find the right position

Your helmet should sit level on top of your head, without covering your eyebrows or sitting low down on the nape of your neck. You should be able to fit 1-2 fingers between your eyebrows and the front edge of the helmet. A quick test* you can try which works for most people: If you were to walk upright into a wall, your helmet should come into contact with it before your nose does.

*We take no responsibility for any damaged noses caused by people headbutting or running full-speed into walls whilst trying out this test

4. Set the tightnessBack to top

Helmets typically come with either a set of interchangeable thick/thin inner padding, an adjustable ring at the back of the head, or both. Once you have found the correct position, try changing the inner pads and/or adjusting the ring-strap to find the best fit. This is usually done by trial and error, but only needs to be done once.

Your helmet should be:

  • Tight enough that you can shake your head around without the lid flopping all over the place
  • Loose enough to not cause headaches
  • Loose enough to be easily removable by hand without trying to take the top of your head off with it

Step 5: Adjust the strapsBack to top

Your helmet will have an adjustable chin strap, and often also adjustable front & rear straps on each side. First, centre the buckle or quick-strap under the middle of your chin using the left/right straps. As you make adjustments, you want this buckle to stay in the middle.

With the helmet on and in place, open your mouth as wide as you can:

  • If your chin pulls the strap down very tightly, it needs to be slackened
  • If your chin doesn’t pull the strap at all, it needs to be tightened
  • If your chin just begins to pull on the strap, it is tightened correctly

Whilst you are out riding your bike:

  • If your helmet rocks forwards over your forehead, the padding/head band may be too loose and the rear straps need to be tightened
  • If you helmet rocks backwards and exposes your forehead, the padding/head band may be too loose and the front straps need to be tightened

Popular choicesBack to top