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GiroRadix MIPS Helmet


Item # GIRZ31K

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  • Matte Black, L ($99.95)
  • Matte Black, M ($99.95)
  • Matte Black, S ($99.95)
  • Matte Black Hypnotic, L ($99.95)
  • Matte Black Hypnotic, M ($99.95)
  • Matte Chalk, L ($99.95)
  • Matte Chalk, M ($99.95)
  • Matte Portaro Grey, M ($99.95)
  • Matte Portaro Grey, S ($99.95)
  • Trim Red, L ($99.95)
  • Trim Red, M ($99.95)
  • Trim Red, S ($99.95)
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Item # GIRZ31K

Radix MIPS Helmet

The Radix helmet supplies top-notch functionality and durability features at an entry-level price point. MIPS technology diffuses rotational force in the event of a crash, giving you confidence in your equipment and as a result, your riding.

Antimicrobial padding and an adjustable visor add to the functionality of the helmet, making it a go-to choice for riders who frequent the trails during the week. The minimalistic feel remains comfortable for long rides while making the helmet suitable for the occasional road-ride commute.

  • Stylish helmet meets the demands of modern aggressive trail riding
  • Lightweight feel and maximum ventilation provide all-day comfort
  • Roc Loc 5.5 technology allows for an impressive range of adjustability
  • EPS foam liner is directly fused to polycarbonate shell for durability
  • Adjustable visor adjusts for branch and sun protection
  • Ages 5 and older

Tech Specs
Shell Materialpolycarbonate
Ventilation25 vents
Fit AdjustmentRoc Loc 5.5
Visor15 degrees of adjustment
Manufacturer Warrantylimited 2 years


Adult Cycling Helmets
Super Fit™
Head Circumference

18.5 - 20in

(47 - 51cm)

20 - 21.75in

(51 - 55cm)

21.75 - 23.25in

(55 - 59cm)

23.25 - 24.75in

(59 - 63cm)

24 - 25.55in

(61 - 65cm)

Head Circumference

21.25 - 24in

(54 - 61cm)

19.75 - 22.5in

(50 - 57cm)

22.75 - 25.5in

(58 - 65cm)

How to Measure:
For best results, use a tape measure to measure around your head where your hat would fit comfortably.

What do you think about this product?


>Rating: 4

Awesome helmet for the weekend warrior

I've used it several times
True to size
Size Bought
6` 0"
190 lbs

This helmet performs admirably at this price point. If you're riding once or twice a week, this helmet will definitely suit your needs. The adjustment is simple and wide-ranging so that it will fit most noggins. It's lightweight but still feels substantial enough to protect your dome. The straps are sort of annoying in that sometimes they will twist up around the ear, but as an entry-level helmet, you really can't ask for better.

>Rating: 5

Good value, light weight

I've used it several times
True to size
Size Bought
5` 10"
150 lbs

This helmut is comfortable and fits well especially with the choice of sizes instead of one size fits all. Make sure you measure your head to select the proper size. Good value for a mountain bike helmut that I also use from road biking and has all the features I really need. Sunglasses fit well with helmut on. Adjustment in back works well. Only slight drawback is that the visor is not adjustable such that it can be pulled down to block the sun near dawn and dusk.