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The high-performance, lightweight Lithos has everything hard-charging mountain bikers need to tackle the most demanding trails. Excellent coverage. Awesome high-speed and low-speed ventilation. And great usability, thanks to a removable and adjustable visor that gives 10-degrees of indexed tilt adjustment.

Lithos

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Features

  • In-mold composite skeleton increases structural integrity and allows a greater variation of vent shape and size
  • Micro-Manager - Fully adjustable fit system accommodates a wide range of head sizes
  • AgION fit pads - Moisture-wicking antimicrobial pads eliminate odors completely and naturally
  • LockDown strap dividers - Helmet strap management made simple: flip open to adjust, flip closed to secure
  • Internal, recessed channels manage airflow through the helmet and over the head
  • Removable visor with 10 degrees of adjustability
  • Unconditional Bontrager Guarantee
  • Crash Replacement Guarantee - Free replacement if your helmet is involved in a crash during the first year of ownership
Part No. Certification Color Size Weight
420421 CE, CPSC Adult Black Bontrager S 52 - 56cm 310g
420422 CE, CPSC Adult Black Bontrager M 54 - 60cm 330g
420423 CE, CPSC Adult Black Bontrager L 58 - 64cm 350g
420425 CE, CPSC Adult White Bontrager S 52 - 56cm 310g
420426 CE, CPSC Adult White Bontrager M 54 - 60cm 330g
420427 CE, CPSC Adult White Bontrager L 58 - 64cm 350g
420429 CE, CPSC Adult Digital Blue Bontrager S 52 - 56cm 310g
420433 CE, CPSC Adult Tech Grey Bontrager S 52 - 56cm 310g
420434 CE, CPSC Adult Tech Grey Bontrager M 54 - 60cm 330g
420435 CE, CPSC Adult Tech Grey Bontrager L 58 - 64cm 350g
430260 CE, CPSC Adult Rhythm Blue / Green Bontrager S 52 - 56cm 310g
430261 CE, CPSC Adult Rhythm Blue / Green Bontrager M 54 - 60cm 330g
430262 CE, CPSC Adult Rhythm Blue / Green Bontrager L 58 - 64cm 350g
Lithos

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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.

Lithos

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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.