The Chicco Fit2 attaches straight to the Chicco Bravo; there is nothing extra to buy. With the carrier on, you are pushing about 35.9 lb (24.9 lb stroller, 11 lb carrier). The seat itself is rated up to 35 lb and up to 35 in, per Chicco.
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2 other infant seats fit the Chicco Bravo; Chicco KeyFit 30 and Chicco KeyFit 35 need no adapter at all.
Summary from the makers' published data.
How to set up the Chicco Fit2 on the Chicco Bravo
What you need
The Chicco Bravo
The Chicco Fit2 carrier (its car base stays in the car)
The Chicco carrier attaches straight to the stroller frame; the manuals below show exactly where.
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.
“Compare Full-Size Strollers ... Bravo / Bravo Sport / Bravo LE ClearTex / Bravo Primo ClearTex / Corso LE / Corso Primo ClearTex / Corso Flex ... Car Seat Compatibility: All KeyFit & Fit2”