Congrats on choosing a Seven! Just got my Axiom in July, first day out rode in an Aquabike race, 2.4 mile swim, 112 m. bike! No soreness at all! Seven is an awesome company, they and your bike shop can recommend which bike, Axiom or Elium, would be right, as wel as your correct crank length. I went with all their choices and couldn't be happier or more comfortable! Good luck in your search! By the way, Seven's customer service is phenomonal!