Riding a bike can be a nice way to change up your birding pace. You can cover a lot of ground quickly and as soon as you see bird activity you can just stop and get off the bike for a while. I think birds are less spooked by a bicyclist than they are by a pedestrian too. You kind of sneak up on them silently and quickly.
I'm old school when it comes to biking. You're not going to convince me that riding in traffic is safer than riding on a sidewalk. Bicycle versus car-the bike loses every time. I don't mind slowing down to a walking pace where there are potential obstacles. If I see a pedestrian I am more than happy to hop off the bike and walk it until the pedestrian passes. Still, a path specifically designed for biking is better than a sidewalk.This time of year you can come across migrant birds even on a well-manicured city path. The House Wren has a bubbly song that it repeats constantly. Another noisy bird that is here throughout the year is the Northern Mockingbird. They're always busy singing multiple songs or staring you down as they go about conspicuously gathering food.