The sl sprint 12 degree 1 18 carbon stem from zipp had one main goal to be the best performing carbon stem ever it does that by having the highest stiffness to weight ratio of any stem on the market it has an amazing 18gnm stiffness which has been achieved by using srams exogram technology to design it the same technology which helped design the ultra light and strong sram red cranks just like a cyclist optimises performance by being as light but as powerful as possible the sl stem is