Driven Racing 420 Front Sprocket - Honda Grom / Monkey 125

Driven Racing EVO TECH 15 tooth front sprocket for Honda Grom and Monkey 125cc with 420 chain. This is a high-quality, case-hardened steel replacement sprocket.

Driven Honda Grom / Monkey 125 front sprockets for 420 chain is available in 15 tooth, which is the stock front sprocket size on the Honda Grom.

A few rules regarding gear ratios for sprockets are as follows:

• Drop teeth on front/add teeth to rear = increased torque, increased acceleration, wheelies, racetracks with short straights
• Add tooth on front/reduce teeth on rear = increased top end speed, open road cruising, lowers RPMs, better gas mileage, tracks with long straights
• 1 down on the front is like adding 3 teeth on the rear
• The bigger the rear sprocket, the lower the gearing and the faster the acceleration
• Available in 15 Tooth
• Case Hardened
• Fits #420 Chain
• Inner Diameter (peak to peak): 14mm
• Inner Diameter (valley to valley): 17mm
• Thread Size: M6x1.00
• Made in USA!

Honda Grom 125

Model Fitment

Honda Grom 125, Honda Monkey 125