Shin Yea Yamaha Zuma 125 Final Drive Gear Set (2009-2015)

If you're planning on using your 2009-2015 Yamaha Zuma 125 scooter as a street-driven, drag-bike, you really need the best acceleration you can buy. While top speed is important, you need to get to that speed quickly. This is where the 12/40 (3.33 Ratio) gear set comes in. You get the best acceleration and with a small hurt in speed, while at the same time being able to tackle steeper hills, too. The 12/40 will also work well with stock Zuma 125.

For Zuma 125 with a big bore that's looking for more top speed, the 13x39 (3.00 ratio) is what you need.

 2009-2015 Yamaha Zuma 125 Final Drive

• 11/44 = 4.00:1 ratio: OEM Final Drive
• 12/43 = 3.58:1 ratio: 
• 12/40 = 3.33:1 ratio: Optimum gear for 70mph
  
• 13/39 = 3.00:1 ratio: Big Bore Motor