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Britax Roundabout 55 - Onyx

The Britax Roundabout 55 achieves revolutionary head safety through the use of Britax SafeCell Technology in the base, integrated steel bars, and energy absorbing Versa-Tether that work together to minimize head excursion and reduce the risk of head injury during a frontal impact. The Roundabout 55 also incorporates Britax Side Impact Protection, offering a five-point harness, as well as multiple buckle and recline adjustments. A body pillow is provided for extra comfort and infant positioning.


  • Base with SafeCell Technology designed to compress in a crash, significantly lowering the center of gravity and counteracting the forward rotation of the child seat which normally propels the child toward the front seat
  • Integrated Steel Bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash
  • Energy-Absorbing Versa-Tether features a staged-release tether webbing to slow the forward movement, reducing the crash forces reaching the child, and a two-point attachment to minimize forward rotation while anchoring the top of the child seat
  • Side Impact Protection with energy-absorbing EPP foam distributes crash forces, shields from vehicle intrusion, and contains the head, neck and body
  • Premium Lower LATCH Connectors for a quick and simple installation featuring a push button for easy release
  • Certified for Aircraft Travel
  • Includes car seat base

Manufacturer Recommended Weight/Height Limits:

  • Rear Facing: 5 to 40 pounds
  • Forward Facing: 20 to 55 pounds
  • Up to 46 inches

Product Dimensions:

  • Width/Height/Depth: 18.5 x 26 x 21 inches
  • Weight: 17.6 pounds

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• Made in the USA and Imported
• 100% Polyester

Product Notes

Popularity: #9 in Car Seats
View All Britax Roundabout 55 View All Britax View All Car Seats

Britax Roundabout 55-G3 - Silverlake

442 reviews
$159.99 SALE

List: $199.99

Britax Roundabout 55-G3 - Silverlake
Discontinued by vendor
Britax Roundabout 55-G3 - Gumdrop
Discontinued by vendor
Britax Roundabout 55-G3 - Isabella
Discontinued by vendor
Britax Roundabout 55-G3 - Onyx
Discontinued by vendor
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