Classes are assigned to racehorses based on their Levels and Evo. Racehorses that have Levelled Up enough will be able to upgrade and race in higher classes. For example, racehorses with similar statistics and Levels will be grouped in Class 6. Depending on its Evo, that racehorse can upgrade to Class 5.
In ZED RUN, Class 1 is the highest rated Class and Class 6 is the lowest.
A racehorse’s highest class is determined by its breed type and Evo. Lower breed types and Evo will result in lower max levels, thus limiting how high in the class system it can reach. However, high breed types and Evo will mean a racehorse can reach higher in the class system.
No, racehorses can only move up in classes with an optional upgrade when it reaches its level cap.
Racehorses can only race in their own class.