The dual-sided Park Tool GSC-3 Drivetrain Cleaning Brush is specifically designed for cleaning hard-to-reach areas of your drivetrain. The long, stiff bristles of the GSC-3 are narrow enough to reach between the gears of tightly-spaced modern cassettes, while the slim contoured end is capable of picking grit and grime out of tight spaces such as derailleur pulley wheels.
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