are use to buy cars and shops. They are also use for research and breeding bikes. (They can be a bet in a drag race(easy mode).)
Also see Mystery card.
Ways to earn coins:
- Selling bikes
- Collecting them in buildings
- Increasing your Reputation
- Random event to find a Spy.
- Win a race against a Friend (not implemented yet)
- Leveling up
You can also earn coins by spending 
, but this is generally considered a waste of resources. For example, 100 only earns you 25,000 Coins - you can earn more than that by selling a few of the bikes.