Variable Pulley

PULLEY AND SPEED SHIFTING SYSTEM AS NARROW AS THE BELT

YOU CHANGE THE GEAR RATIO BY SMOOTHLY CHANGING THE DIAMETER

NO AXIAL DISPLACEMENT

NO EFFORT TO CHANGE THE GEAR RATIO

NO EFFORT TO KEEP THE SAID DIAMETER

NO NEED FOR A TRAPEZOID BELT

NO HEAVY AND BULKY CONE

JUST A NARROW PULLEY