Other bike-rental companies are considering raising prices, as warmer weather brings a likely rebound in trip numbers.
Chinese bike-rental firms, Mobike and Hello Transtech, expressed their willingness to enter the bidding.
Didi hopes new strategies will help it complete a U-turn that will get it out of the dead-end in which it finds itself.
The rental economy has permeated every aspect of life.
The rules went into effect on Wednesday on Didi’s bike-rental platforms Qingju and Bluegogo.