Summer in Tokyo: Cycling, general q’s

Hey everyone,

I am a student (21M) doing an internship in Tokyo this summer. I am posting to ask about the following questions I have:

1. Bike Rental: I am an amateur cyclist and think renting a bike while in Tokyo would be a lot of fun / allow me to see a lot of the city quickly on my rides. Do you know of any place where I could rent a nice road bike (size 56cm)? Any cycling groups that I might be able to join / do group rides with?

2. What are the best ways to meet other people? Is it culturally appropriate to approach people and start conversations? I don't want to be rude or culturally insensitive at all.

3. Any other Tokyo-specific advice for how to fit in more?