The introduction of indexed shifting by SHIMANO, and the subsequent evolution of the SIS technology over the decades, defined the reliable and enjoyable ride experience that most of us take for granted today. Gone are the days of knee-shifting the downtube levers in the middle of a field sprint or fiddling to find the right gear during a critical section of trail.
SHIMANO Indexed Shifting means that a properly adjusted system will deliver the right gear at critical moments over and over again. It saves energy, allowing riders to focus on responding to attacks during a race, picking perfect lines through roots and rocks, or just cruising along while enjoying the ride.
changed the very experience of riding a bicycle for the better, and this technology continues to evolve year after year on every SHIMANO drivetrain.