Help

Guides

Step-by-step guides for every tool, plus everything about accounts, the trial and your subscription.

Create an account, sign in, add to home screen, start a trial, and manage or cancel your subscription. On Android you can also install the app.

Pick your bike, change sprockets and see speed in every gear, roll-on pull times, chain length, tire effect and power to weight.

Time 0–60, 60–130, 1/8 and 1/4 mile and more with your phone’s GPS. Graphs, timeslip, history and custom windows.

Log or import Dragy times and correct them for weather (density altitude) and weight so you compare your bike to itself.

An educational ignition-timing estimate for liter-class sportbikes, with an RPM × throttle map you can download as CSV.

Live conditions, density altitude, US alerts, hourly and 7-day forecast and a radar loop for where you ride.

Garage & quick calculators

Keep your bikes in one list, pick the active one for the quick calculators, and edit or remove them.

Change a bike’s power, weight, redline, primary ratio, sprockets, chain, tire and gear ratios, or enter a new bike by hand.

Search the 137 bikes from the gearing bench library and add one to your garage in a tap.

Step the sprockets and see the final drive and speed at redline in every gear, stock vs now.

How many links you need for new sprockets, worked out from your stock chain and sprockets.

Compare rear tire sizes: diameter, road speed change and true speed at 100 indicated.

Quick roll-on time and distance estimates for the speed windows you care about.

hp per ton, pounds per horsepower and watts per kilogram for your bike and rider.

Keep peak hp and torque from your dyno sheets, with the sprockets each run was on.

Still stuck? Read the FAQ or contact us.