Hello, I am training for my 1st Century this spring. I usually ride 25 to 45 miles at a a time alone. 17 to 18 mph avg. Would this ride be out of my league? or will riding in a group with periodic stops help me through this? Also does anyone reccomend a good quality pair of shorts for a long ride. At 30 miles I tend to have some soreness. Not sure if due to low end shorts or improper seat height. Any help or reccomendations would be nice in what to expect.