I only get a chance to ride with a group once a week and some of them are riding in the 53 tooth cog and some in the small cog. I am confused. When riding by myself I ride the small cog and can ride between 20 and 22 mph with a cadance of 100 or high. Is it better to keep the higher cadance? When riding with a pack should I go to the 53 to build some strength because the draft will make it easier? Thanks for the help