Bell 4Forty Air MIPS MTB Helmet

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  • The perfect Trail helmet with extended coverage
  • Accommodates both goggles and glasses
  • MIPS® Technology (integrated with fit system)
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The 4Forty Air MIPS is equipped with pro-level features yet designed with the privateer in mind. With a sleek new shell design and 3-position visor, the benefits aren’t just visibly rad but functionally significant for increased air ventilation, effective sweat management, and better goggle compatibility. Bell’s Float Fit™ system, built-in Sweat Guide™ and anti-microbial Ionic+ padding ensures all-day comfort, while integrated MIPS and extended hard-shell coverage helps you stay committed in all shred conditions. Upgrades like eyewear ports, a Fidlock® magnetic buckle, and premium straps make the 4Forty Air MIPS your go-to for daily trail riding life.

  • Rotational Energy Management
  • MIPS® (integrated with fit system)
  • 3-Position Adjustable Visor
  • Goggle Gripper
  • Eyewear Ports
  • Fidlock® Magnetic Buckle
  • No-Twist Tri-Glides™
  • Sweat Guide™
  • Ionic+™ Comfort Padding
  • Construction: Fusion In-Mold polycarbonate shell - A process pioneered by Bell bonds the helmet's outer shell to the EPS foam liner to create a sturdier helmet.
  • Fit System: Float Fit - A minimalist, lightweight fit system with an easy-to-turn rubber over moulded dial for adjustments. No-Twist Tri-Glides: Quick-adjust fasteners that help keep straps flat and properly positioned
  • Weight: 360 grams (size M)
  • Certifications: CPSC Bicycle*, CE EN1078

What is MIPS? MIPS (Multi-Directional Impact Protection System) is a leading slip plane technology inside the helmet designed to reduce rotational forces that can result from certain impacts.

    Size Chart

    MPNBEH7139320, BEH7139321, BEH7139322, BEH7139323

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    Our Payment Options

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    Online we currently accept payment from the methods listed above including a wide range of finance options. In store we also accept payment in the form of cash and gift vouchers.

    Finance Options

    In order to get the kit you want, when you need it, without ruining the family finances we offer a highly flexible range of finance options to help you get the best products on your bike now rather than at the end of the season when you've saved up the cash to make the purchase. There are even interest free options which effectively spread the cost without costing you any extra.

    D.T.(Automotives) Limited T/A Tweeks Cycles is authorised and regulated by the Financial Conduct Authority and is the broker and not the lender. Our FCA registration number is 689896. D.T.(Automotives) Limited offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance and Klarna. Credit is provided subject to affordability, age and status. Minimum spend applies. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority.

    Delivery & Returns

    UK Mainland Delivery Prices

    Delivery Type Cost Estimated Delivery Time
    Standard Delivery for orders under £49.99 from £1.33 2-3 working days from day of despatch(Excludes weekends and Bank Holidays)
    Standard Delivery for orders over £49.99 Free
    Express Delivery from £1.68 1-2 working days from day of despatch(Excludes weekends and Bank Holidays)
    Special Delivery from £12.54 For any next working day delivery order before 4pm Monday to Thursday.
    For any weekend delivery order before 4pm Friday
    Click & Collect from £7.62 Collect your parcel from a local post office. 2-3 working days from day of despatch(Excludes weekends and Bank Holidays)

    For international shipping please visit our delivery page.

    For information about returning an item please visit our returns page.