Wilier gtr sl endurance ultegraroad bikethe wilier gtr sl endurance ultegraroad bike is light and responsive yet comfortable and versatile its also more aerodynamic than previous generations in fact its so good that it performs almost as well as wiliers top of the line models and its not hard to see why when you consider that the frame weighs a mere 990g in the medium sizewilier has employed forks with a tapered 1 18 to 1 steerer which provides strong and responsive control th