Bikes.

Your average speed in mph and km/h, plus pace per mile and per km, or how long a ride takes at a target speed.

Your pedalling cadence in rpm from your speed, chainring, cog and wheel size, with gear ratio and development.

Estimate how far your electric bike will go from its battery watt-hours, assist level, terrain and weight.

Gear ratio, gear inches, gain ratio, metres of development and speed from your chainring, cog, wheel and cadence.

Recommended frame size and S/M/L from your height and inseam for road, gravel, mountain, hybrid and city bikes.

The correct chain length in links and inches from your chainstay and largest chainring and cog.

Calories burned on an exercise bike from your weight, workout time and intensity, with your calories-per-hour burn rate.

Distance covered on a stationary bike in miles and km from your workout time and average speed, with pace per mile.

Calories burned per session and per week on an exercise bike, your weekly weight loss, and how long to reach your goal.

A structured indoor cycling session built from your goal, time and fitness level, with warm-up, intervals and calories.

What a frame refinish really costs, with prep, blasting, finish and masking itemised and a realistic quote range.

Estimate what your bike is worth from its original price, age, condition and type, with a fair asking-price range.

Saddle height, setback, bar drop, reach, stem length, crank length, bar width and frame size from your height and inseam.

The watts you need to hold a given speed, with W/kg and a full aero, rolling resistance and gravity breakdown.

Calories burned on a recumbent exercise bike from your weight, workout time and intensity, with your calories-per-hour burn rate.

A recommended mountain bike handlebar width in mm from your height, riding discipline and shoulder width, with a range to test.