◀ TOOLSBATTERYPACK WEIGHT
EVUL Empire Racing

GEARING CALCULATOR

MOTOR PINION → SPUR → DIFF PINION → RING → WHEEL · final drive, rollout, top speed, motor load
GOODCAUTIONRACE ZONE · at the limitBEYOND LIMIT · past the motor's published rating

Starting numbers and thresholds are EXAMPLE ASSUMPTIONS, adjustable under Advanced. Motor ratings: Tenshock factory chart. RATED = published number · EST. = estimated from published numbers · FIT = gearing fit, not a rating.

Gears turn at their true speed ratio
MOTOR Tenshock EVO
HOW TO MEASURE ROLLOUT (tire circumference)
1 · MARK TIRE + FLOOR 2 · ROLL EXACTLY ONE TURN 3 · MEASURE MARK TO MARK = CIRCUMFERENCE Use your race tire, glued and trued. Push down with about the car's weight. Diameter × 3.1416 = circumference. Foam / belted tires grow at speed: see growth %
ADVANCED · pack, efficiencies and status thresholds
SETUP STATUS
LIMIT
Stage 1 (spur÷pinion)
Diff (ring÷pinion)
Extra stage
Motor turns per wheel turn
Rollout per motor rev
Wheel torque multiplier
Top speed
Theoretical top
Taller gear (lower number) = more load on motor and pack. Check the pack in the Battery Sizing Calculator: enter this final drive as its gear ratio.
WHAT IF · current vs alternative (gears or tire)
QUICK LOOKUP · final drive for pinion × spur