Show Sidebar
  
  
Park Tool Quality for Drivetrain Maintenance
This dual-sided brush is specifically designed for cleaning hard-to-reach areas of the bicycle 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.
 
            
            
            
            
             
           
          ![Shimano BUILT-IN TYPE Di2 BATTERY [SD300 TYPE]](https://unitedbycycling.com/cdn/shop/files/shimanoBT-DN300-di2battery_220x220.jpg?v=1735645011) 
          ![Shimano BUILT-IN TYPE Di2 BATTERY [SD300 TYPE]](https://unitedbycycling.com/cdn/shop/files/shimanoBT-DN300-di2battery-electronicshifting_220x220.jpg?v=1735645030) 
           
           
           
          
         
           
           
           
           
           
           
           
           
               
               
               
               
               
               
               
             
             
             
             
             
             
            