Flat Fender Customs
Gear Ratio Calculator
Squarespace-ready HTML calculator for matching tire size, highway speed, transmission top gear, and target RPM to a practical axle ratio.
Results
Ideal Ratio
0.00
Nearest Available
0.00
Engine RPM @ Speed
0
Flat Fender Customs
Speeds & Feeds Calculator
Squarespace-ready standalone HTML tool for manual milling estimates. Use Normal mode for quick shop answers, or switch to Advanced for more material and tooling choices.
Results
RPM
0
Feed Rate (IPM)
0
Chip Load / Tooth
0.0000
Use these as starting values, then tune for machine rigidity, workholding, tool stick-out, coolant, and finish requirements.
Flat Fender Customs
Spring Rate Calculator
Use Single Rate or Dual Rate mode to estimate combined coilover spring rate and wheel rate from motion ratio.
Results
Combined Spring Rate
0
Wheel Rate
0
Estimated Sag
0.0
Single Rate uses one spring. Dual Rate combines two springs in series until crossover.