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We're sorry but all Size options for this product are currently out of stock. You can be notified upon their arrival by choosing the Size option you are interested in and then entering your email in the yellow box below.
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Thor Quadrant Pro Circuit Helmet
  • Thor Quadrant Pro Circuit Helmet
  • Thor Quadrant Pro Circuit Helmet
  • Thor Quadrant Pro Circuit Helmet

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The Quadrant Helmet offers increased performance, reduced weight, and innovative styling. Designed to exceed both DOT and ECE 22.05 standards, the Quadrant is truly a world-class helmet loaded with features normally found only on more expensive helmets. Featuring a dual-density expanded polystyrene liner, extensive venting, molded roost guard and a plush removable liner, the Quadrant offers comfort and performance in a lightweight package that’s got just the right balance and a great, secure fi t. Next time you ride, don’t settle for anything less then the category leading Quadrant Helmet.


  • Blended Acrylonitrile Butadiene Styrene and Polycarbonate shell provides maximum coverage without excess weight
  • Molded roost guard for added protection
  • Oversized forehead venting
  • Direct flow mouth guard with mesh filter
  • Dual-density expanded polystyrene liner
  • Plush removable/washable comfort liner
  • Molded rear goggle strap holder
  • DOT and ECE 22.05
  • Approximately 3.2 LBS. (1450 GRAMS)

Thor Helmet Sizing

Size Inches CM
2XS 20-1/2 52-53
XS 20-7/8 - 21-1/4 53-54
SM 21-5/8 - 22 55-56
MD 22-3/8 - 22-3/8 57-58
LG 22-3/4 - 23-1/8 59-60
XL 23-1/2 - 24 61-62
2XL 24-3/4 - 25-1/8 63-64

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

Click here to see the full Thor Size Chart
Product Style RevZilla Item # Manufacturer Product # Availability
XS 787215 01102782 Out of Stock
SM 787216 01102783 Out of Stock
MD 787217 01102784 Out of Stock
LG 787218 01102785 Out of Stock
XL 787219 01102786 Out of Stock
2XL 787220 01102787 Out of Stock


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If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

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Thor Quadrant Pro Circuit Helmet
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