Supersprox - Sprocket 40 Rear Yamaha Black (RST-857-40-BLK) past type tag-Sweaters Junior and Mini Riders Fit:

Junior and Mini Riders Fit: S/M-XXL (105-165cm)

but they aren’t expensive for what you get

Inline water resistant fuse holder

Mirror Diameter = 100mm (4")

Supersprox - Sprocket 40 Rear Yamaha Black (RST-857-40-BLK) past type tag-Sweaters Junior and Mini Riders Fit:Drive Sprocket Front Drive Sprocket Supersprox front sprockets are the best on the market today, with a balance between performance and longevity. Features SCM435 Ni Chrome Molybdenum low corrosion steel. Case hardened surface for maximum water resistance. Low carbon core to prevent breakage. Has the ultimate combination of strength and hardness. Rear Drive Sprocket (many style available) Stealth Sprocket (aluminum & steel) Longer system life without