This is a well ridden hard packed dirt road in East San Diego located off the 8 freeway behind the Viejas Casino. It’s a little over 4 miles of 6% if you count the uphill paved bit before the dirt begins. In terms of rideable dirt, this is about as firm as it gets. Graham has ridden this on 23, 25, and 28 mm tires with his PR coming on the 25’s. It wasn’t noticeably different using 25-28.