J. billig set a record in P-AG in 2013 and Scooter's yearbook shows her on a scooter. But don't ask me how that was possible, because the wheels are not 15". Must be because it was running in "Production" class with original wheels that weren't 15". You'll really have to send an email to BMST tech, because they don't usually like to answer tech questions on the forum.
Tom