I've put the ride (Coromandel northern loop) into the calendar, and details from the club newsletter in the Rides Calendar, Auckland forum. Rides to the south of Auckland usually start from the motorway service centre (BP) near Papakura, and rides to the north from Starbucks at Westgate. I doubt if yours would be the oldest bike on the ride, and it sounds like there might be a gravel option if that is of any interest to you.