Radian 3QXT › fit in › Honda Fit
Will the Diono Radian 3QXT fit in a 2015–2020 Honda Fit?
The Radian 3QXT is about 17" wide; the Fit's usable rear bench is about 47". It fits one rear position comfortably. Three across is tight (51" needed vs 47"). Note: rear legroom here is limited, so a rear-facing install may crowd the front passenger.
What fits this Fit
- One seat, rear position: Yes. The Radian 3QXT installs in an outboard rear position of a 2015–2020 Honda Fit, though you may slide the front seat forward for rear-facing.
- Three across: Tight — three need ~51" against only ~47". A narrower seat is the better bet.
- Modes this seat covers: rear-facing → forward-facing → booster.
- LATCH: lower anchors up to 40 lb; the Fit has 2 lower-anchor positions.
Common questions
Will the Diono Radian 3QXT fit in a 2015–2020 Honda Fit?
Yes — the Diono Radian 3QXT (17" wide) fits a single rear seating position in a 2015–2020 Honda Fit. Because this vehicle has limited rear legroom, a rear-facing install may require sliding the front seat forward. Three across is tight — its rear bench is about 47" and three of these would need 51".
Can you fit three Radian 3QXTs across a Fit?
Probably not — three Radian 3QXTs need about 51" but the Fit's usable bench is only about 47". Consider a narrower seat — see our narrowest-seats guide.
Sources: seat ratings & modes — NHTSA (pulled 2026-06-17); dimensions — manufacturer specs and owner measurements. 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.