Vortex Racing Rear Sprockets - 420 (40-54 tooth)

Made with the highest quality 7075 T6 aluminum. The 420 pitch size is made for mini bikes (pit bikes), such as the Honda Grom, Honda Monkey, XR50/CRF50, and Kawasaki Z125.

30 tooth is the stock size for the Kawasaki Z125 rear sprocket.  
34 tooth is the stock size for the Honda Grom rear sprocket and Monkey rear sprocket on 14-21 models. 2022 and newer Groms with the 5spd use a 38 tooth rear sprocket. 

Color options include silver, black, red, and blue.

Available for:

  • Honda - Grom MSX125 (MSX 125)
  • Honda - XR50/CRF50
  • Honda - Monkey 
  • Kawasaki - Z125 Pro (Z 125)


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