Chengdu Rental Bicycles

There is an ingenious technology-based bicycle rental system here. Almost everywhere we see tidy rows of yellow bikes.

Every so often it's obviously necessary to rearrange them.

From "Synotrip": 

https://www.synotrip.com/samtour/public-bicycle-rental

You need to require a local transportation card (Tianfu Tong), which can get from bus stations, some super markets and grocery stores, this card also can be used for city bus and metro,  after recharging 300 RMB as bicycle deposit to your card, you can use the card to get a bicycle from any cycling station.

It's free if you only used for less than one hour, then every two hours is 2 RMB.