Cycling Tools
Tyre pressure, gearing and the numbers that decide how a bike actually rides.
Front and rear tyre pressure from your weight and tyre width, with the hookless and sidewall limits applied — not one number for the whole bike.
Bike Gear Ratio and Gear Inches CalculatorGear inches, development, ratio and speed at any cadence for every gear on your bike — with the overlapping gears you cannot actually feel flagged.
FTP and Cycling Power Zones CalculatorEstimate FTP from a 20-minute, 8-minute or ramp test, get all seven Coggan training zones in watts, and see your watts per kilogram.
Cycling Climb Time and VAM CalculatorHow long a climb takes at a given power, with VAM, average gradient and where the watts actually go — validated against famous climbs.
Bike Chain Length CalculatorHow many chain links your bike needs, from chainstay length and your largest ring and sprocket — plus the wrap method that gets the cut right.
Cycling Ride Fuel and Calorie PlannerCarbohydrate, fluid and sodium per hour for a ride, the energy it actually costs, and how many gels or bars that means packing.
Bike Fit CalculatorSaddle height, crank length and frame size from your inseam and height, with the symptom table that tells you which way to adjust.
Bike Chain Wear and Service Interval CheckerRead a chain wear measurement against the right threshold for your drivetrain, and see which service jobs are due or overdue by mileage.
Century and Long Ride Pacing PlannerWhat moving average a target finish time actually demands once stops and climbing are counted, with checkpoint times to ride to.
Bike Commute Savings CalculatorWhat cycling to work saves against driving — with the fixed costs excluded unless the car genuinely goes away, which most versions of this get wrong.
E-Bike Range and Charging CalculatorRealistic e-bike range from battery, assist level, weight, speed, climbing and temperature — plus charge time with the lithium taper included.
Bikepacking Load and Daily Distance PlannerWhat your loaded bike weighs, how far that gets you in a day on road, gravel or trail, and whether the food you packed covers the route.
About these cycling tools
Almost every question about how a bike rides comes back to two numbers, and both are routinely set wrong. Tyre pressure is the first. The figure that matters is tyre drop — how far the tyre squashes under load, around 15 per cent — and holding that constant means the front and rear need genuinely different pressures, because a seated rider puts roughly 55 per cent of their weight on the back wheel. Running both ends the same guarantees one of them is wrong, and it is usually the front, which ends up harsh and short of grip. Width matters more than anything else here: moving from 25 mm to 32 mm cuts the correct pressure by about a third, so fitting wider tyres and keeping the old pressure produces a bike that rides worse than it did before. Gearing is the second. Gear inches collapses chainring, sprocket and wheel size into one comparable number, which is the only way to tell whether a new cassette actually changes anything — and it usually reveals that a double chainset carries several pairs of gears within a few per cent of each other, steps too small to feel and therefore gears you have paid for and cannot use.