Bell 4Forty MIPS Bike Helmet

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Mountain biking is a demanding sport, and compromising on gear is never a good idea. The Bell 4Forty MIPS bike helmet withstands the rigors of the trail, with generous venting and extra rear coverage.

  • Features

    • Boasting comfort, protection and capable features of helmets costing twice as much, it's a bantamweight, all-conditions, all-kinds-of-trail champion packing heavyweight value
    • Rotational motion can cause brain injuries; with MIPS, a low-friction layer slides 10 to 15mm in all directions, reducing rotational motion to the brain during impact
    • Fusion in-mold polycarbonate shell boasts a comfortable Float Fit that's integrated with the MIPS technology
    • 15 vents let cooling airflow in
    • GoggleGuide adjustable visor system puts the visor where you want it
    • Adjustable No-Twist tri-glides keep the helmet straps flat and properly positioned
    • Sweat Guide padding ensures your eyes stay clear for the trail
    • CPSC Bicycle and CE EN1078 certified


    To find your size, position a tape measure just above your ears and about 1 in. above your eyebrows. Keep the tape level to measure the circumference around the largest part of your head and then find the corresponding size in the Technical specs info.
    View all Bell Mountain Bike Helmets
  • Technical Specs

    Best Use

    Mountain Biking

    Helmet Style

    Mountain Bike

    Helmet Construction


    Shell Material







    13.4 ounces



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