Reply To: 2018 series talk Home › Forums › Club Races › Racing Calendar, Classes & Regulations › 2018 series talk › Reply To: 2018 series talk January 7, 2018 at 11:37 PM #11527 porsche917Keymaster RevoSlot rules update – minimum front tire diameter post race – the minimum front tire diameter post race has been changed from 19.60mm to 19.40mm. Please prepare your cars to this new standard. Marty
