I could swim 25m when I was 5 so I must have learned before that, but I didn't get a bike until I was 7 so I didn't learn until then.

Dd1 could swim independently with arms and breathng from age 4 but had lessons from 6m. She rode her pedal bike before she turned 4, never had training wheels as she had a run bike.
Dd2 is 3 and can swim about 5m independently but has had lessons from 6m as well. She rides her run bike everywhere and can balance and turn with 2 feet off the ground so I dare say as soon as she is tall enough for dd1's old bike she will be on that with no training wheels.