Drivetrain Engineering LabDeterministic Final Drive & Speed-per-Gear Simulator
Motorcycle Gearing, Sprocket & Chain Calculator
Analyze factory vs. modified sprocket configurations, 520 chain conversions, speedometer calibration offsets, swingarm axle slot displacement, and full speed-per-gear RPM curves across OEM platforms.
Speed Units:
Instant Tuning Profiles
Factory BaselineHonda OEM
Front Countershaft
14T
Rear Driven Wheel
40T
Chain Pitch & Links
520 • 106L
OEM Final Ratio
2.857
Rear Tire: 120/80-18 (78.29" circ)
Primary Ratio: 2.808:1 • Redline: 9,000 RPM
Active Configuration (Custom)0.0% Delta
New Final Ratio
2.857
Swingarm Axle Displacement
0.0 mm Neutral
Wheelbase remains at OEM baseline position with chosen sprocket and chain link count.
Countershaft Speedo Calibration
0% Error
At an indicated 70 MPH, true actual speed is 70 MPH.
520 Race Conversion Analysis
520 Standard Pitch
Retains OEM chain pitch and tensile ratings. Upgrade to 520 for reduced gyroscopic inertia.
Interactive Engine Tachometer Scrub
9,000 RPM
1,000 RPM (Idle)4,500 RPM (Mid-Range)9,000 RPM (Rev Limiter)
Verified Catalog Hardware
Matching Chains, Sprockets & Drivetrain Workshop Tools
Browse authentic replacement drive components configured for Honda CRF300L / Rally.
Drive Chains
520 Pitch Chains (106L+)
D.I.D, RK, EK X-Ring / O-Ring sealed chains.
VIEW IN-STOCK CHAINS →
Countershaft Sprockets
Honda 14T Front
Sunstar, Vortex, Renthal case-hardened steel.
BROWSE FRONT SPROCKETS →
Rear Sprockets
Honda 40T Rear
7075-T6 Hard-Anodized Aluminum & Steel.
BROWSE REAR SPROCKETS →
Workshop Tools
Chain Breaker & Press Tool
Heavy-duty pin extractors and quad-stake riveting kits.
VIEW CHAIN TOOLS →