Only certain Chicco/Peg Perego models; maker points to its compatibility chart.
About this pair
The Chicco KeyFit 30 goes on the Baby Jogger City Mini GT2 with the Baby Jogger City Mini adapter for Chicco seats (model 2083994), about $84.99. With the carrier on, you are pushing about 31.9 lb (22.4 lb stroller, 9.5 lb carrier). The seat itself is rated up to 30 lb and up to 30 in, per Chicco.
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11 other infant seats fit the Baby Jogger City Mini GT2.
Summary from the makers' published data.
How to set up the Chicco KeyFit 30 on the Baby Jogger City Mini GT2
What you need
The Baby Jogger City Mini GT2
The Chicco KeyFit 30 carrier (its car base stays in the car)
The Baby Jogger City Mini adapter for Chicco seats (model 2083994)
Step by step
1Take the stroller canopy off and recline the backrest.
2Assemble the adapter as shown in the manual.
3Make sure the elastic fabric is not covering the accessory mounting slots.
4Push the L and R adapter brackets into the stroller's mounting brackets until they click (left and right as seen facing the stroller).
5Set the car seat on the brackets and press down firmly until it clicks.
Baby Jogger says it needs an adapter (City Mini adapter for Chicco seats).
“2026 INFANT CAR SEAT (ICS) COMPATIBILITY LIST ... Chicco: KeyFit 30 | city mini GT2: 2083994* (* Can only be used with the stroller when the canopy is removed)”