Dissident

Designed for riders who push the limits of downhill speed and big air, the Dissident is the lightest, most-ventilated, and technically advanced carbon fiber full-face mountain bike helmet available today.

Designed for riders who push the limits of downhill speed and big air, the Dissident is the lightest, most-ventilated, and technically advanced carbon fiber full-face mountain bike helmet available today.

Helmet Size Chart

Model
Fit Size
Hat Size
Inch
Metric
Airnet
Small
6-3/8 -
7
20"-
22"
51-
56cm
Medium
6 7/8-
7 3/8
21 3/4"-
23 1/4"
55-
59cm
Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
Align
One Size
6 3/4-
7 3/4
21 1/4"-
24 1/2"
54-
62cm
Ambush / Ambush Comp
Small
6 3/8-
7
20"-
22"
51-
56cm
Medium
6 3/4-
7 1/4
21 1/4"-
23"
54-
58cm
Large
7 1/8-
7 5/8
22 1/2"-
24"
57-
61cm
X-Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
Aspire
Small
6 3/8-
7
20"-
22"
51-
56cm
Medium
6 7/8-
7 3/8
21 3/4"-
23 1/4"
55-
59cm
Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
Centro
One Size
6 3/4-
7 3/4
21 1/4"-
24 1/2"
54-
62cm
Chamonix
One Size
6 3/4-
7 3/4
21 1/4"-
24 1/2"
54-
62cm
Covert
Small
6 1/2-
7
20 1/2"-
22"
52-
56cm
Medium
7-
7 1/2
22"-
23 1/2"
56-
60cm
Large
7 1/2-
7 7/8
23 1/2"-
24 3/4"
60-
63cm
Covert Kids
X-Small
6-
6 5/8
18 1/2"-
20 3/4"
47-
53cm
Small
6 1/2-
7
20 1/2"-
22"
52-
56cm
Medium
7-
7 1/2
22"-
23 1/2"
56-
60cm
Dissident / Dissident Comp
Small
6 3/4-
6 7/8
21 1/4"-
21 3/4"
54-
55cm
Medium
7-
7 1/8
22"-
22 1/2"
56-
57cm
Large
7 1/4-
7 3/8
22 5/8"-
23"
58-
59cm
X-Large
7 1/2-
7 3/4
23 1/2"-
24 1/4"
60-
62cm
Duet
One Size
6 1/4-
7 1/4
19 3/4"-
23"
50-
58cm
Echelon
Small
6 3/8-
7
20"-
22"
51-
56cm
Medium
6 7/8-
7 3/8
21 3/4"-
23 1/4"
55-
59cm
Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
Evade / Evade Tri
Small
6 3/8-
7
20"-
22"
51-
56cm
Medium
6 7/8-
7 3/8
21 3/4"-
23 1/4"
55-
59cm
Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
Flash
One Size
6 1/4-
7 1/4
19 3/4"-
23"
50-
58cm
Flash
One Size
7-
8
22"-
25 1/4"
56-
64cm
Mio
One Size
< 6-
6 3/8
18"-
20"
46-
51cm
Prevail
Small
6 3/8-
7
20"-
22"
51-
56cm
Medium
6 7/8-
7 3/8
21 3/4"-
23 1/4"
55-
59cm
Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
Propero 3
Small
6 3/8-
7
20"-
22"
51-
56cm
Medium
6 7/8-
7 3/8
21 3/4"-
23 1/4"
55-
59cm
Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
S-Works TT
X-Small/Small
6 3/8-
7 1/8
20"-
22 1/2"
51-
57cm
Medium/Large
6 3/4-
7 1/2
21 1/4"-
23 1/2"
54-
60cm
Sierra
One Size
6 1/4-
7 1/4
19 3/4"-
23"
50-
58cm
Shuffle Child
One Size
6 1/4-
6 7/8
19 3/4"-
21 3/4"
50-
55cm
Shuffle Youth
One Size
6 1/2-
7 1/8
20 1/2"-
22 1/2"
52-
57cm
Small Fry Child
One Size
< 6-
6 7/8
18 1/2"-
21 3/4"
47-
55cm
Small Fry Toddler
One Size
< 6-
6 1/2
17 1/2"-
20 1/2"
44-
52cm
Tactic
Small
6 3/8-
7
20"-
22"
51-
56cm
Medium
6 7/8-
7 3/8
21 3/4"-
23 1/4"
55-
59cm
Large
7 3/8-
7 7/8
23 1/4"-
24 3/4"
59-
63cm
  • Engineered to protect World Cup downhill and gravity riders.
  • Meets the ASTM DH safety testing standards for impact protection and chin bar performance.
  • Lightweight Carbon Matrix shell—target weight 1000g.
  • 4th Dimension Cooling System and ventilation provides superior comfort.
  • Magnetic chin strap buckle improves comfort and allows for easy, one-handed use.
  • Helmet EJECT™ system compatible.
  • Leatt™ brace compatible.
  • Speaker compatible.
  • Includes a padded travel bag with micro-fleece liner and external goggle pocket.
  • Removable washable liner and cheek pads.
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Dissident

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