one of most favorable price, authentic components for the bicycle(derailleur, brake, crank,saddle,flywheel, chain and so ... assemble the bicycle themself . It is very difficult for you to judge whether the components (saddle, tire, shifter,brake, crank and so ... , from training to racing. Also available in a 700Cx25 size for touring and commuting.Grooved slick designIron Cloak protectionFront or Rear ...