Bell 4Forty Air Mips MTB Mountain Cycling Helmet











Key Features:
- Impact Management: Mips® Evolve
- Circumference: 52-56 cm
- Construction: Fusion In-Mold polycarbonate shell
- Visor: 3-Position adjustable visor
- Fit System: Float Fit™ with Fidlock® Buckle
- Product Weight: 360g (Size M)
- Certification: Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older
Occasionally, without notice, manufacturers change product design and/or specifications.
Bell 4Forty Helmet Size Guide
|
Size |
Cm |
Inches |
|
S |
52 – 56 |
20 ½” – 22” |
|
M |
55 – 59 |
21 5/8” – 23 ¼” |
|
L |
58 - 62 |
22 ¾” – 24 3/8” |
|
XL |
61 - 65 |
24” – 25 5/8” |
How to measure
To find the circumference of your head, place a tape measure in the centre of your forehead, wrap it around above your ears and around the back of your head. If there's a slight difference between two different sizes, always go for the tighter size.
Once you know the circumference of your head, select a size with a range that your head size fits within.

As well as an adjustable chin strap the majority of cycling helmets have some form of adjustment for size, usually in the form of a ratchet adjuster to tighten or loosen the headband or replaceable pads of different thicknesses.
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