If you are currently running at a sprint track, in ICC - Intercontinental C (2004 IKF National Class #9), the most likely road race crossover classes are...
 
 

IKF National Class #14 - ICC

 
Rule Differences...
 

Chassis:
 

Minimum seat inclination of 50 degrees from horizontal.
 

Race / Heats:
 

20 minute heats.
 

IKF National Class #17 - Formula 125

 
Rule Differences...
 

Chassis:
 

Minimum seat inclination of 50 degrees from horizontal.
 

Race / Heats:
 

20 minute heats.
 

NCK Local Option Class #29 - West Coast 125cc Sprint

 
Rule Differences...
 

Chassis:
 

Minimum seat inclination of 50 degrees from horizontal.
 

Race / Heats:
 

30 minute race.