Solo. There were three significant climbs, one climb of 5% for 4km, one climb of 5% for 3km, and one 2km climb at 9%. The rest of the ride was fairly flat with a few rolling hills. It was a bit hot at 35C (95F) so I ran out of gatorade with 30km left (poor planning). I thought 3litres would be enough but I guess not.