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Planet X

On-One Helmets

Off-Road Protection


Off-Road Protection From On-One

Whether you're XC racing, trail riding or earning the descents by pedalling the inclines we've got the perfect helmet for your preferred riding style. The new range of On-One off-road helmets delivers the protection you need and the comfort and good looks that everyone wants at prices that won't leave a hole in your pocket.

Our XC helmet offers lightweight protection and maximum ventilation. With a carefully designed aero profile and 22 vents, it'll keep you cool and protected in the heat of competition and on your longest trail adventures.

For riders who love a gravity challenge but don't want to be encumbered by the weight and heat build up of a full-face helmet we have designed our new On-One Enduro helmet. With extended side and rear protection, 3-way fit adjustability and a durable Double Shot construction it's perfect for Enduro exploits.


  • Lightweight Protection
  • Double Shot Construction
  • Maximum Ventilation
  • Featherweight
  • In-Mould Anchored Fixtures
  • 3-Way Adjustability
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Maximum Cooling Effect

Minimum Drag

Air Conditioning For Your Head

Computer designed Venturi Air-Vents provide exceptional air flow through the helmet to keep your cool without adding excessive drag. Front visors help to enhance air-flow over your head as long as you are moving.

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Tilt, Height And Circumference Adjustment

Dial In Your Perfect Fit

3-Way Fit Adjustability

3-way size adjustability offers height, circumference and tilt adjustment to enable you to dial in the perfect fit. Every On-One helmet offers 15mm of height and 65mm of circumference size adjustment.

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Anchored Helmet Fixtures

Strong And Secure

In-Mould Technology

The strongest way to construct a helmet with strategic fixture and fitting anchor points being bonded directly into the EPS body of the helmet during injection moulding to help provide you with a stronger and safer helmet.

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Protection And Performance

Designed For Real Cycling

Lightweight, High Strength

Every one of our helmets is designed with the optimal balance of safety and lightweight in mind. We select only the finest materials and weave them together with the most advanced construction techniques to create helmets of matchless quality.

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Planet X

On-One Helmets range

From £4.99
Carnac / On-One XC MTB Helmet Spare Pad Set

Replacement pad set for your favourite XC MTB helmet from On-One or Carnac.

  • OEM replacement pad set

From £19.99
On-One Enduro MTB Helmet

Enduro is the MTB buzz word this season and we've always been huge fans of slogging the climbs to earn the right to smash out the downhill section and now we have the perfect helmet to keep us safe as we push the limits.

  • Extended rear coverage
  • Sizes: Small-Med 56-59cm, Lrg-XL 59-61cm
  • Weight: 345grams Sm-Med
  • en 1078 approved

From £19.99
On-One XC MTB Helmet

With the On-One XC helmet protecting your head there's one less thing for you to think about while you ride. Designed with XC racing and trail riding in mind this lightweight marvel offers all-round protection, massive ventilation and easy adjustment.

  • Lightweight protection and maximum ventilation
  • Durable, seamless, dual-shot, in-mould construction
  • 3-Way, height, tilt and circumference adjustment
  • Removable, anti-bacterial comfort pads and fly mesh