To best decide between the Britax Marathon G4.1 or Diono Radian RXT carefully review our detailed analysis. To help you make the decision that is right for you, we’ve compiled a list of the most important specs and features in our comparison table.
Britax Marathon G4.1 vs Diono Radian RXT

Britax Marathon G4.1

Diono Radian RXT

Spec Comparison of Britax Marathon G4.1 and Diono Radian RXT

Britax Marathon G4.1 Diono Radian RXT
Our rating: Our rating:
Type
Convertible Car Seat Convertible Car Seat
Color Options
Azul, Confetti, Onyx, Domino, Gridline, Jet set, Pink giraffe, Silver cloud, Static, Blue, Midnight, Shadow, Black scarlet, Black mist, Black plum, Essex
Child Weight Min – Rear Facing
5 lbs
5 lbs
Child Weight Max- Rear Facing
40 lbs
45 lbs
Child Weight Max- Forward Facing
20-65 lbs 20-80 lbs
Child Standing Height
49″ or less
44″ or less
Child Seated Shoulder Height Min – Rear Facing
9″
Child Seated Shoulder Height Max – Rear Facing
16.75″
Child Seated Shoulder Height – Forward Facing
12-16.75″
Shoulder Width
13″
14″
Inside Hip Width
14″
Inside Seat Depth
12″
Inside Seat Height
24″
External Widest Point
19″
17″
Type of Harness
10-position, quick-adjust harness 5-point energy-absorbing harness
Lowest Harness Position
8.5″
9″
Highest Harness Position
17.5″
17.5″
Expiration Date
7 years 10 years
Car Seat Weight
19.5 lbs
22 lbs
Car Seat Height
26″
28.5″
Car Seat Width
18.5″
17″
Car Seat Depth
21″
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
  • Safe cell complete side impact protection plus provides an advanced level of protection: a deep, foam-lined shell absorbs crash forces and shields your child from debris, and an energy-absorbing headrest keeps your child’s head and neck secure
  • Quick-adjust, 10-position harness and 2-position buckle allows you to easily move the harness upward and 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
  • Rear facing 5 to 45 pounds. Forward facing 20-80 pounds (up to 57″) in 5-point harness. Booster to 120 pounds
  • Infant body support cushions and memory foam for added comfort
  • Adjustable headrest with reinforced sidewalls. Infant body support insert is tucked under the seat.
  • Lined with EPS foam and energy-absorbing harness system for added safety
  • Folds flat for travel and fits 3 across in mid-sized vehicles

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    Britax Marathon G4.1 vs Diono Radian RXT

    Britax Marathon G4.1 vs Diono Radian RXT