YOU CAN IMPROVE BOTH THE PERFOMANCE AND APPEARANCE OF YOUR BIKE WITH DRIVEN SPROCKETS!.  THE FRONT SPROCKETS ARE MADE OUT OF CASE HARDENED CHROMOLY STEEL AND MACHINED TO EXACT DIMENSIONS, HEAT TREATED FOR GREATER SURFACE STRENGHT AND HARD ANODIZED FOR PROTECTION AGAIN CORROSION.  ALL SPROCKETS ARE MACHINED TO TOLERANCES NO GREATER THEN 0.2 MM WHICH IS LESS THEN HALF OEM STANDARDS 

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