Grothus Dragbikes Adds Special Incentives to Man Cup Dragway 42 Race, July 13-15 Jack Korpela 6 years ago The Grothus Dragbike team in the IDBL winners circle at the July 30th Bike Fest. Check out the incentives the Grothus Dragbike racing team has added for competitors entering the Man Cup Fast by Gast Nationals at Dragway 42, July 13-15. Ed Grothus