Renthal 420-47P Rear Sprocket, 121U-420-47GBBU, for Yamaha YZ65

Renthal UltraLight Rear Chainwheels are CNC machined from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel. Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer. A combination of high strength base material, cutting edge manufacturing methods and exceptional hardwearing surface treatments its clear to see why Renthal's light weight all aluminum rear sprockets can be found on the rear wheels of many factory race team machines.

The Renthal UltraLight Rear Chainwheel is a CNC-machined rear sprocket made from 7075 T6 aluminum. Its lightweight construction is designed to reduce rotating mass compared with steel sprockets, while computer-engineered tooth profiling supports efficient power transfer and consistent chain engagement.

Manufactured to tight tolerances, this blue Renthal rear sprocket is engineered for precise fitment, concentricity, and load dispersion. Its hardwearing surface treatment is designed to support durability in powersports applications.

This sprocket fits 2018, 2019, 2020, and 2021 Yamaha YZ65 models. The manufacturer part number is 121U-420-47GBBU, and the vendor part number is 121U-420-47GBBU.

Features:

• Brand: Renthal
• Model: UltraLight Rear Chainwheel
• Size: 420 chain size with 47 teeth
• Part Number: 121U-420-47GBBU
• Material: CNC-machined 7075 T6 aluminum
• Color: Blue
• Design: Grooved rear sprocket with computer-engineered tooth profiling
• Fitment: 2018 Yamaha YZ65
• Fitment: 2019 Yamaha YZ65
• Fitment: 2020 Yamaha YZ65
• Fitment: 2021 Yamaha YZ65

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1
Fitment:
2018 Yamaha YZ65 Base
2019 Yamaha YZ65 Base
2020 Yamaha YZ65 Base
2021 Yamaha YZ65 Base