Sram sl 500 aero tt shiftersrams sl 500 aero tt shifter provides high performance shifting for tt and triathlon enthusiasts at a much more economical price point with indexed shifting setup is easy and gear changes are fast and precise so you can solely focus on the road ahead sl 500 shifters are made from lightweight aluminium and are also very comfortable in the hand thanks to their ergonomic shape featuresmaterial aluminium shifter bladetechnology highlight exact actuationrear indexe