Chain & Sprocket Calculator
Calculate final drive ratio, top speed at redline, and cruising RPM. See the effect of going up or down a tooth before you buy.
Quick Presets
Current Sprockets
Ratio: 2.471:1
Proposed Sprockets
Ratio: 2.588:1
Engine & Tire
Side-by-Side Comparison
| Metric | Current (17/42) | Proposed (17/44) |
|---|---|---|
| Final Drive Ratio | 2.471:1 | 2.588:1 |
| Top Speed (at redline) | 470 MPH | 449 MPH |
| RPM at 60 MPH | 1,532 | 1,605 |
Speed change: -4.5% — lower gearing (more torque, less top speed)
Sprocket Tuning Rules of Thumb
• −1 front tooth ≈ +3–4 rear teeth in ratio change. Front changes are cheaper and easier.
• Larger rear / smaller front: more acceleration, lower top speed, higher cruising RPM.
• Smaller rear / larger front: better top speed, lower highway RPM, less low-end pull.
• Check chain length requirements after any sprocket change — you may need to add or remove links.
• Always replace chain and both sprockets together for even wear.