The speed 55t fulcrum spent hours and hours in wind tunnels they studied the effects of rolling on the structure of the rim to make a wheel dedicated to the very essence of speed when average speeds are really high and every watt has to count the new 55 mm design is the latest response to the historic challenge of headwinds and attrition rim full carbon technology full carbon fulcrumreg rims are built using combinations developed in the laboratory of different types of fibre includ