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SIS Rear Index Shifting System

SIS Rear Index Shifting System

The system constituents such as the index mechanism built in the shifter, the frictionless SIS rear index shifting cable and the smooth action rear derailleur realize the SHIMANO INDEX SYSTEM.

Benefits & Features

・ Fast, accurate, indexed shifting performance

What is SIS?

SIS = SHIMANO INDEX SYSTEM was introduced by SHIMANO in 1984. Each SHIMANO component group featured SIS.
SIS features a mechanism inside the shifter. Because of this mechanism you hear a ‘click’,every time you shift. The shifter and rear derailleur make a synchronised movement.

SIS, what does it feature?

Accurate shifting

By using the SHIMANO shifting lever, rear derailleur, multiple freewheel, chain, outer casing and cable guide, you can obtain an accurate, fast and smooth shifting performance.

Release cyclists from mis-shift 

By simply “clicking the shifter” to the next gear, you can keep your eyes on the road. Thus SIS gives a contribution to enjoyable cycling.

Optimise bike's performance & cycling performance

SIS makes cycling easier and brings shifting performance to a higher level.

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