Gazelle S FAQ names non-Cybex seats that 'also fit', without saying which adapter they need.
Two car seats on the Gazelle S (twin mode) need additional adapters.
About this pair
The Nuna Pipa (original) goes on the Cybex Gazelle S with the Cybex Gazelle S car seat adapter (model 520003583), which ships with the stroller. With the carrier on, you are pushing about 36.4 lb (28.4 lb stroller, 8 lb carrier).
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5 other infant seats fit the Cybex Gazelle S.
Summary from the makers' published data.
How to set up the Nuna Pipa (original) on the Cybex Gazelle S
What you need
The Cybex Gazelle S
The Nuna Pipa (original) carrier
The Cybex Gazelle S car seat adapter — it comes in the box
The adapter maker shows the fitting steps in pictures; see the manuals below.
Before every walk
Check that the carrier is locked on both sides the way your manual describes. How we check our answers
Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.
Cybex says it needs an adapter (Gazelle S car seat adapter).
“... the Maxi Cosi Mico 30, Maxi Cosi Mico Max, Maxi Cosi Coral XP, Nuna Pipa, Nuna Pipa Lite, Chicco Keyfit 30, Peg Perego Primo Viaggio 4-35, Peg Perego Lounge, Britax Bsafe 35, and Britax Bsafe 35 Elite also fit.”