Zipp s newly redesigned Service Course SL stem takes the proven legacy of the original and brings it bang up to date. Designed for the fit And performance needs of Pro Cyclists Lightweight 7075 Aluminium construction with titanium Torx T25 hardware31.8mm handlebar clamp diameter & suitable for 1 1/8th inch steerer tubesWeight from just 125gProven at the very highest level with victories in Paris-Roubaix and the Vuelta a Espana, the Service Course SL is lightweight and stiff with next to no flex during sprints and accelerations and weights starting from just 125g. The 7075 aluminium construction is strong and durable, while the 2 finish options are the ultimate in class and go perfectly with any modern road bike. Titanium T25 Torx hardware is also ultralight and will keep looking great for years to come. Available in a huge range of sizes and rises, there is a Service Course SL stem for any cyclist looking for top level performance and killer looks.