Fits YAMAHA Adult bikes
YZF 250 / 450
YZ 125 / 250
• The longest lasting most durable off-road sprocket you can buy developed over 5 years.
• The unique flat face design keeps weight to a minimum and means the TwinRing's as narrow as a regular chainwheel.
• Inner Ring is high strength Ultralight 7075 T6 Aluminium. Outer Ring is Electroless Nickel Coated steel
• Outer is expanded at 200 °C and then fitted to inner, creating a permanent bond for the life of the sprocket