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O'Neal Sierra Helmet vs Scorpion ADX-2 Flip-Up Helmet

The Scorpion ADX-2 is the more versatile helmet: a flip-up chin bar, a wide size run and an adventure shell that works on road and dirt. The O'Neal Sierra is a simpler full-face off-road helmet with Bluetooth built in, which suits riders who stay off pavement and want comms without add-ons. Owners of the ADX-2 praise the modular chin bar and drop-down sun visor; Sierra owners like the light shell but note wind noise at highway speed.

  • Choose the O'Neal Sierra if you ride mostly dirt, want a full-face off-road helmet, and want Bluetooth ready out of the box.
  • Choose the Scorpion ADX-2 if you ride a mix of road and trail and want a flip-up chin bar and a sun visor.

Prices

  • O'Neal Sierra Helmet: $149.00 at eBay (last seen Nov 10)
  • Scorpion ADX-2 Flip-Up Helmet: $206.31 at Motoin (last seen Nov 10)
  • Difference: the O'Neal Sierra Helmet is $57.31 cheaper than the Scorpion ADX-2 Flip-Up Helmet at the latest prices (Nov 10)
O'Neal
O'Neal Sierra Helmet

O'Neal Sierra Helmet

$149.00at eBayChecked 13 h ago
See all prices and details
Visit eBay

Store links may earn us a commission.

Pros
  • Bluetooth included, no add-on unit needed
  • Full-face off-road shell with peak
  • ECE certified
  • Simple, light build for dirt riding
Cons
  • No flip-up chin bar
  • No internal sun visor
  • Limited size availability
  • Wind noise on the highway
Scorpion
Scorpion ADX-2 Flip Up Enduro Helmet

Scorpion ADX-2 Flip-Up Helmet

Scorpion ADX-2 Flip Up Enduro Helmet

$206.31at MotoinChecked 13 h ago
See all prices and details
Visit Motoin

Store links may earn us a commission. Price via Klarna.

Pros
  • Flip-up chin bar for stops and hot days
  • Internal drop-down sun visor
  • Wide size range from XS to XL
  • Works on road and trail
Cons
  • No Bluetooth built in
  • Heavier than a plain off-road shell
  • Modular mechanism adds parts to maintain

What separates them

O'Neal Sierra HelmetScorpion ADX-2 Flip-Up Helmet
Chin barFixed full-faceFlip-up modular
Intended useOff-road and motocrossAdventure, road and dirt
BluetoothBuilt inNot built in
Sun visorNot listedDrop-down internal visor
Size rangeX-Large only listedXS through XL
CertificationECE certifiedECE certified (adventure full-face)
Weight and noiseLighter shell, noisier at speedHeavier, quieter behind the visor

Price history

$206.31$149.00
Nov 10Nov 11
  • O'Neal Sierra Helmet: lowest $149.00 on Nov 11 at eBay.
  • Scorpion ADX-2 Flip-Up Helmet: lowest $206.31 on Nov 10 at Motoin; $206.31 on Nov 11.

Prices at every store

O'Neal Sierra Helmet

  • eBayNew

    Availability unknownSold by visana19

    $149.00Checked 13 h ago
    Visit eBay
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $161.99Free shippingChecked 13 h ago
    Visit Amazon
  • oemcycle.comNew

    Availability unknown

    $161.99Checked 13 h ago
    Visit oemcycle.com
  • Motorcycle CloseoutsNew

    Availability unknown

    $161.99Checked 13 h ago
    Visit Motorcycle Closeouts

Store links may earn us a commission.

All 7 stores and price history →

Scorpion ADX-2 Flip-Up Helmet

  • MotoinNew

    In stock

    $206.31+ $37.83 shippingChecked 13 h ago
    Visit Motoin

Store links may earn us a commission. Price via Klarna.

Prices and history →

Specs compared

SpecO'Neal Sierra HelmetScorpion ADX-2 Flip-Up Helmet
StyleFull Face, Off-road—
BluetoothYes—
DepartmentMen's / Unisex—
ECE CertifiedYes—
UseMotorcycle—
SizeX-Large—
Color—Black, Red, Gray
Helmet Size—XS, S, M, XL
Age Group—Adult
Type of Helmet—Adventure, Flip-up Helmet, Full Face Helmet

What reviewers say

Scorpion ADX-2 Flip-Up Helmet

Owners call the ADX-2 a versatile, good-value modular adventure helmet. Many praise the sun visor and flip-up chin bar, while others complain about weight and wind noise at speed.

What people mention
  • WeightCriticisedOwners say it feels heavy, especially after long rides or compared with fixed full-face helmets.
  • NoiseCriticisedRiders report wind noise at highway speed and suggest earplugs.
  • Sun visorPraisedThe retractable internal sun visor is a favorite feature for bright days.
  • Flip-up chin barPraisedOwners like flipping the chin bar up at stops and for talking.

Questions and answers

Which is better for highway commuting?
The Scorpion ADX-2. The flip-up chin bar and internal sun visor make it easier to live with on road, and the closed shell is quieter than the Sierra's off-road shape.
Which is better for motocross and trail riding?
The O'Neal Sierra. It is a dedicated off-road full-face with a lighter build, and the built-in Bluetooth keeps comms without a separate unit.
Does the Scorpion ADX-2 have Bluetooth?
No. You add a communicator to the ADX-2. The Sierra has Bluetooth built in.
Which lasts longer?
Both are ECE certified and should hold up for a normal helmet service life. The ADX-2's flip mechanism is the extra wear point; keep it clean and it holds up.
Is the ADX-2 worth stepping up to?
If you ride on road as well as dirt, yes. The flip-up chin bar, sun visor and wider size range cover more riding than the Sierra's fixed off-road shell.

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