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.

Features

  • Lightweight road helmet for superior performance
  • 21 CFD software enhanced vents for maximum airflow and efficiency
  • Premium, wicking fit pads
  • One-hand adjustable ZipTite fit system
  • Three sizes ensure the best fit
  • In-molded strap retention system with Lockdown strap adjusters
Part No. Size Certification Color Weight
430266 Elite S 20 1/2 - 22 1/8, 52 - 56cm CE, CPSC Adult Black / White / Red 280g
430268 Elite L 23 1/2 - 25, 60 - 64cm CE, CPSC Adult Black / White / Red 320g
420670 Elite S 20 1/2 - 22 1/8, 52 - 56cm CE, CPSC Adult Matte Black 280g
420677 Elite L 23 1/2 - 25, 60 - 64cm CE, CPSC Adult White / Silver 320g

Pro Sizing

Measure the circumference of your head using a cloth tape measure or a piece of string and a ruler. Use the chart below to find the proper helmet size based on your measurement.

cm 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
  Small                  
          Medium            
                  Large    
                      X-Large

1 Head

Take your measurement horizontally across your brow and over your ears.

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.