Riding position explained

You want to understand why you sit the way you do: tubes, measurements and angles of the bike.

The bike

Bike explained Tap any tube or component: what it is and what it changes about your position. Stack to reach The number from forums and geometry charts: typical values per bike type across rider height. Frame map Every frame on one map of stack and reach, and where your measurements put you. Geometry lab Five sliders on the frame: what angles and lengths change for you and for the ride. Calm or agile How a bike steers, on one axis with real bikes.

You on the bike

Where the bars go The field where your hands should be: riding style sets the height, your arms set the length. Crank and foot What a different crank length and a different foot angle change at the saddle, hip and knee. Where your weight sits The centre of mass of you and the bike, and how much weight rests on the front wheel. How do pros sit? Four bikes from four eras: how the pros' position has changed.