... findet man auch

I don't know if this fits your context, but "motor-racing" googles well with "junior series"

Hope that helps!

--------------------------------------------------
Note added at 30 mins (2009-10-28 14:22:07 GMT)
--------------------------------------------------

This may or may not be relevant in your case:

Formula Junior is a formula racing class first adopted in October 1958 by the CSI (International Sporting Commission, the part of the FIA that then regulated motorsports). The class was intended to provide an entry level class where you could use inexpensive mechanical components from ordinary automobiles. The idea to form the new class came from Count Giovanni "Johnny" Lurani who saw the need of a class for single-seater racing cars where younger drivers could take their first steps.

http://en.wikipedia.org/wiki/Formula_Junior

This is a possibility, although it will depend on your precise context.

See, e.g.

But a permanent foothold in Formula One racing remained elusive and in 2005, Kovalainen signed to drive in GP2, the new feeder series for Grand Prix aspirants.
http://www.formula1.com/teams_and_drivers/drivers/813/biogra...

Michel: "GP2 bleibt Nachwuchsserie Nummer eins"
Schon allein das macht uns zur erfolgreichsten Nachwuchsserie auf dem Weg zur Formel 1.
http://www.motorsport-total.com/formelsport/news/2009/03/Mic...

F1: New Feeder Series to Rival Successful GP2 Might Not Be All It Seems
http://bleacherreport.com/articles/32958-f1-new-feeder-serie...