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Styled for maximum airflow and go-fast good looks, the lightweight, 21-vent Circuit was designed using Computational Fluid Dynamics, for an air-gobbling shape that delivers superb ventilation and unbeatable air flow.


$129.00 AUD



  • Lightweight road helmet for superior performance
  • 21 CFD software enhanced vents for maximum airflow and efficiency
  • Premium, wicking fit pads
  • One-hand adjustable Zip-Tite fit system
  • Three sizes assure the best fit
  • In-molded strap retention system with Lockdown strap adjusters
Part No. MSRP* Size Certification Color Weight
424890 129.00 Small (52-56cm) AS/NZS 2063 Gray / Red / White 280g
424893 129.00 Small (52-56cm) AS/NZS 2063 White / Silver 280g

*Pricing is set by Bontrager retailers and does not include freight, import duties or taxes for retailers outside of the US.

Ride it and love it. If not, we’ll take it back.

Ride it and love it. If not, we’ll take it back.

It’s that simple.

If for any reason you’re not satisfied with your Bontrager products, return the item - along with the original sales receipt - to the place of purchase within 30 days of purchase date for exchange or store credit.