Getting started
Setting up your bike, tires and cockpit
How frame size, tires, rim widths and cockpit choices feed the model.
Frame and size
Choosing a catalog bike links it to its reference CdA. When geometry is available, selecting your size adjusts that figure relative to the size that was tested.
Tires and rims
Pick the actual tire, pressure, tube type and surface. Internal and external rim width change the tire's real width; enter a measured width (WAM) if you have one and it overrides the estimate.
Cockpit
Enter spacers, stem length and bar width. Tick 'Custom handlebar' only for aftermarket bars to reveal stem angle, bar reach and bar drop.
Try it on your own rides
Start free →