Motorcycle 520 Front Sprocket For Yamaha MT-03 16-22 YZFR3 15-22 YZFR25 15-18 FZ400 TT500 DT400 Fit For Yamaha MT-03 MT03 MTN320 16-22 FZ400 YZFR3 15-22 YZFR25 15-18 TT500 77-80 DT400 75-76 520 motorcycle front sprocket; standard inner spline fits countershaft without for quick installation machined tooth profile 520 chain; reduces drivetrain vibration power loss during acceleration adopts treated carbon material; long term chain friction thermal deformation under load integrated anti wear tooth surface; extends life for daily commuting off road riding accurate inner spline size tooth pitch; creates stable seamless fit with engine drivetrain assembly