Biking in Tokyo

I am considering buying a folding bicycle while in Tokyo next month and bringing it home. Any recommendations on brand, etc.? Any recommended bicycle shops near Ueno or Asakusa? Thanks.

A bicycle specialty store near Ueno
"Hakusen Co., Ltd."
Taito-ku, Tokyo Taito 4-13-20

http://www.hakusen.co.jp/_Shop/index.htm%82%8C


A catalogue of folding bicycle
http://www.flow76.com/bbb/
There is folding bicycle by "electric assistant player-type bicycle"

If there is the plan that you go to Shinjuku for, please try to go to "Tokyu Hands".
folding bicycle is sold in "Tokyu Hands".
http://www.tokyu-hands.co.jp/shinjuku.htm

Thank you!