Just as your choice of fi’zi:k Spine Concept™ saddle shape is guided by your degree of spinal flexibility & subsequent pelvic rotation, fi’zi:k offers this same Spine Concept™ guideline to help you choose your most comfortable road handlebar shape. The application of The Spine Concept™ to handlebar shape is the result of fi’zi:k’s research with riders of 3 UCI World Tour Teams that were riding fi’zi:k saddles. A correlation was found between the saddle shape each rider was using & the handlebar shape they were riding. Your shoulders’ width should determine your handlebar width. Choose from the following centre-centre measurements: 400/420/440/460mm. Fi’zi:k handlebars widths are measured centre-to-centre ‘on the tops’ (behind where the STIs are attached to the bar). They are NOT measured centre-to-centre ‘on the drops’ (between the centre of each bar plug). The Snake Handlebar: If you are very spinally flexible (far less than 90 degrees between your straight legs & your back when bending over as far as you can, keeping your legs straight a shoulders’ width apart), you are a Snake. You are better able to reach further & get down lower to use the full radius of more rounded, classic-style, deeper-drop handlebars. You will prefer the Snake Handlebar because it has a longer reach (85mm) & deeper, classic-style drop (140mm). The Chameleon Handlebar: If you have an intermediate degree of spinal flexibility (approximately 90 degrees between your straight legs & your back when bending over as far as you can, keeping your legs straight a shoulders’ width apart), you are a chameleon. You are better able to reach further, but perhaps you can’t get down quite as low on the handlebar drops as a Snake would be able to. You will prefer the Chameleon Handlebar because it has a longer reach (85mm) but a shallower, more ergonomic-style drop (135mm). The Bull Handlebar: If you have a relatively low degree of spinal flexibility (more than 90 degrees between your straight legs & back when bending over as far as you can, keeping your legs straight a shoulders’ width apart), you are a Bull. You will not be able to reach as far or bend as low as a Snake or a Chameleon would be able to. You will prefer the Bull Handlebar because it has a shorter reach (80mm) & a shallower, more ergonomic-style handlebar drop (130mm).