The Shimano 105 is lighter, more efficient, and makes "pro-level" technology more accessible to part time racers and fitness enthusiasts. Shimano 105 is a by-product of our premier engineering range but has its own unique identity, offering a greatly enhanced feeling and sleek design that's backed by a high performance. The Shimano 105 design concept of "Smooth, Round and Natural" is consistently demonstrated in every component, giving it's user a sense of satisfaction and pleasure and fulfillment.