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Britax Marathon ClickTight fit guide

ClickTight makes a tight belt install foolproof — the entry point to Britax’s convertible line. Here's exactly which children it fits, how NHTSA rated it, and which cars it fits — including three-across.

Britax Marathon ClickTight
★★★★☆NHTSA Ease-of-Use
18.5"external width
Convertibleseat type
0NHTSA recalls
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ℹ️ Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip. Width: Britax published spec (~18.5 in).

Which children it fits

ModeWeightHeightLATCH limit
Rear-facing 5 lb – 40 lb up to 49" up to 40 lb on lower anchors
Forward-facing harness 20 lb – 65 lb up to 49" up to 40 lb on lower anchors

Weight/height limits are the seat's NHTSA-published values. Beyond the LATCH limit, install with the vehicle seat belt instead of the lower anchors. Always follow the labels on your seat and the vehicle manual.

NHTSA Ease-of-Use detail

★★★★☆Overall
★★★★★Securing the child
★★★★☆Vehicle install features
★★★★★Instructions

NHTSA's Ease-of-Use rating measures how easy a seat is to install and use correctly — the single biggest factor in real-world safety, since most seats are installed wrong. It is not a crash-test score; NHTSA does not crash-rate individual car seats.

Which cars the Marathon ClickTight fits three across

At 18.5" wide, three Marathon ClickTights should fit across the back of these vehicles we track (test-fit to confirm):

Ford F-150 SuperCrew
Pickup Truck · 56" bench
3-across fits

Will it fit your exact car?

Check the Marathon ClickTight against a specific vehicle — single position and three-across:

Honda Fit
2015–2020
1–2 fit
Kia Soul
2020–2024
1–2 fit
Honda Civic
2016–2021
1–2 fit
Toyota Corolla
2014–2019
1–2 fit
Subaru Impreza
2017–2021
1–2 fit
Honda Accord
2018–2022
1–2 fit
Toyota Camry
2018–2022
1–2 fit
Honda CR-V
2017–2022
1–2 fit
Toyota RAV4
2019–2024
1–2 fit

Common questions

What are the weight and height limits of the Britax Marathon ClickTight?

Rear-facing: 5 lb–40 lb and up to 49" tall; Forward-facing harness: 20 lb–65 lb and up to 49" tall. These are the manufacturer's NHTSA-published limits — always defer to the label on your seat.

How is the Britax Marathon ClickTight rated by NHTSA?

NHTSA gave the Britax Marathon ClickTight an Ease-of-Use rating of 4/5 stars, including 4/5 for vehicle-installation features. Ease-of-Use measures how easy the seat is to install and use correctly — not crash performance, which NHTSA does not rate for individual seats.

Can the Britax Marathon ClickTight fit three across?

The Britax Marathon ClickTight is about 18.5" wide. Three should fit across the back seat of 1 of the vehicles we track, including the 2015–2024 Ford F-150 SuperCrew.

Sources: ratings, modes & recalls — NHTSA (pulled 2026-06-17); external width — Britax published spec (~18.5 in). Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip.