What Stack and Reach Do I Need?

Determining your ideal stack and reach is a journey of balancing your anthropometric measurements (arm length, torso length, inseam) with your flexibility and riding goals. As a general rule, a “comfort” fit usually requires a higher stack-to-reach ratio (around 1.55 or higher). If you have a shorter torso or limited lower back flexibility, you will need a higher stack to prevent overreaching. Conversely, riders with long arms or high flexibility often prefer a lower stack and longer reach to achieve a flat-backed, aerodynamic profile.

The best way to find your required numbers is to look at a bike you currently find comfortable. Measure its current effective stack and reach. If you feel too cramped, you need more reach; if you feel neck pain, you likely need more stack. Remember that your needs change over time—as you get fitter, you might move toward a more aggressive reach, whereas aging or injury might dictate a move toward a higher stack. A professional bike fit is the gold standard for defining these specific coordinates for your unique anatomy.