Tools

Quick calculators for the pit table

Final drive ratio

Spur ÷ pinion × the transmission's internal ratio.

Spur

Pinion

Internal

7.8:1

Final drive ratio

Spur / pinion

The gear ratio on its own, without the internal ratio.

Spur

Pinion

3:1

Gear ratio

Tyre rollout

Distance the car travels per motor revolution.

Tyre diameter (mm)

Final drive ratio

Leave blank for plain circumference.

201.06mm

Tyre circumference — add a final drive ratio for true rollout

Shock oil

Weight and centistokes, on the chart for the oil in your hand.

Whose oil

The chart most kit manuals and forum posts quote. The safe guess when you are not sure.

Value

From

350cSt

Losi / TLR

Cell resistance spread

Read the internal resistance off your charger, one box per cell.

Cell 1

Cell 2

Cell 3

Cell 4

Fill in the numbers above.

Unit converter

Millimetres to inches, grams to ounces.

Measure

Value

From

1in

What these numbers mean

Each calculator has a page explaining the formula behind it, with reference tables.