Compatible with Yamaha modelsYFZ450R 2009-2021YFZ450 R Special Edition 2010-2021MeasurementsOuter Diameter | 38.5mm Mounting Surface Height | 54.5mmBolt Spacing Center to Center | 115mmAccepts 24t 25mm SplinePart Numbers 18P-2538-00-00 | 18P25380000NoteThis part only fits on the R models/ Will NOT fit YFZ450/ Use only on YFZ450 R Order Includes: 2x Wheel Collars Compatible with Yamaha models: YFZ450R 2009-2021, YFZ450 R Special Edition 2010-2021 Part Numbers: 18P-2538-00-00 / 18P25380000, Measurements: Outer Diameter / 38.5mm, Mounting Surface Height / 54.5mm, Bolt Spacing Center to Center / 115mm, Accepts 24t 25mm Spline Note: This part only fits on the R models/ Will NOT fit YFZ450/ Use only on YFZ450 R We strongly suggest comparing the posted picture to the unit(s) that needs to be replaced. Brand Caltric Exterior Metal Manufacturer Caltric Manufacturer Part Number WH128*2/1