The Britax B-Safe Gen2 goes on the Baby Jogger City Select 2 with the Baby Jogger City Select 2 adapter for Britax seats (model 2151253), about $49.99. With the carrier on, you are pushing about 37.6 lb (26.71 lb stroller, 10.9 lb carrier). The seat itself is rated up to 35 lb and up to 32 in, per Britax.
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11 other infant seats fit the Baby Jogger City Select 2.
Summary from the makers' published data.
How to set up the Britax B-Safe Gen2 on the Baby Jogger City Select 2
What you need
The Baby Jogger City Select 2
The Britax B-Safe Gen2 carrier (its car base stays in the car)
The Baby Jogger City Select 2 adapter for Britax seats (model 2151253)
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.