====== Bike Shop Tycoon ======
Game loop: 
  * Buy store 
  * Buy bikes 
  * Order bike parts 
  * Receive bikes
  * Rent bikes 
  * Repair bikes 
  * Sell old bikes 
  * Expand store 
  * Hire staff 
  * Assign staff to different roles
  * Buy more bikes 
  * Rent more bikes 
  * Buy new store 

 each of these aspects of the game loop should be games themselves. 

Buying bikes you should compare different models and requirements 
Weight and size