Choosing whether to buy Britax Roundabout G4.1 or Diono Radian R120 is likely to be tricky. Here’s a quick snapshot of how the two compare, followed by some more detailed exploration of each point.
Britax Roundabout G4.1 vs Diono Radian R120

Britax Roundabout G4.1

Diono Radian R120

Spec Comparison of Britax Roundabout G4.1 and Diono Radian R120

Britax Roundabout G4.1 Diono Radian R120
Our rating: Our rating:
Type
Convertible Car Seat All-In-One Convertible Car Seat
Color Options
Dash, Luna, Marthon, Silverlake Twilight, Essex
Child Weight Min – Rear Facing
5 lbs
5 lbs
Child Weight Max- Rear Facing
40 lbs
45 lbs
Child Weight Max- Forward Facing
20-55 lbs 20-80 lbs
Child Standing Height
46″ or less
44″ or less
Child Seated Shoulder Height Min – Rear Facing
9″
Child Seated Shoulder Height Max – Rear Facing
15.75″
Child Seated Shoulder Height – Forward Facing
12 – 15.75″
Shoulder Width
13″
14″
Inside Hip Width
11″
Inside Seat Depth
11″
13″
Inside Seat Height
23″
External Widest Point
19″
17″
Type of Harness
5 point No Re-thread Harness 5 points,energy absorbing EPS foam and provide excellent side impact protection
Lowest Harness Position
10.5″
Highest Harness Position
17.5″
17.”
Expiration Date
7 years 8 years as harness: 10 years as booster
Car Seat Weight
17.6 lbs
26 lbs
Car Seat Height
26″
28.5″
Car Seat Width
18.5″
17″
Car Seat Depth
21″
16″
Features
  • Safe cell impact protection is an integrated system of safety components that work together to protect your child beyond the federal safety standards, this includes our impact absorbing base and complete side impact protection plus
  • Safecell complete side impact protection surrounds your child in a deep protective shell designed to absorb crash forces and shield your child from debris
  • Tangle-free, 5-point harness prevents the straps from twisting making it easier to load your child into the seat and ensuring a safer ride
  • 3 recline positions for your child’s comfort and safety
  • Quick-adjust 2-position buckle allows you to easily move the buckle outward for a comfortable, secure fit as your child grows
  • The Diono Radian family of car seats are the only all-in-one car seats with a full steel frame, making them one of the safest car seats available today
  • Grows with your child: rear-facing from 5-45 lbs., forward-facing from 20-80 lbs. (up to 57″) in a 5-point harness, and booster mode up to 120 lbs.
  • Aluminum reinforced sides, energy absorbing EPS foam and Safe Stop harness system for additional safety
  • Infant body support cushions and memory foam for added comfort
  • Folds flat for travel and fits 3 across in most mid-sized vehicles, perfect for growing families

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Britax Roundabout G4.1 Reviews

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Diono Radian R120 Reviews

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    Britax Roundabout G4.1 vs Diono Radian R120

    Britax Roundabout G4.1 vs Diono Radian R120