Wayne Rainey's MotoAmerica race series in the USA has finally come of age with the addition of a Twins Cup class for 2018. Not quite the crazy wide open "GP" type series of the old "Circle Bell" days, but a real twins race class none the less. Presently, there is an 850cc limit on engine size, and the preliminary list of eligible bikes includes a Ducati and a couple Harleys, so let the cheating begin!
Preliminary info:
http://www.motoamericaregistration.com/PDF/2018/Regulations/MotoAmerica%20Twins%20Eligibilty%20List%204.03.18.pdfhttp://www.motoamericaregistration.com/PDF/Bulletins/2018%20Part%202.8%20MotoAmerica%20Twins%20Provisional.pdf