You'll know that you have a bike that is well fitted if you can ride with proper form and comfort for the duration of your ride without any muscle fatigue or discomfort. Proper form means cycling with good posture, whether seated or standing. This means that your upper body will be straight with a slight bend in your elbows and wrists, and your lower body (hips and knees) will be in a straight line with the pedal axle. If you experience pain, numbness, or tingling in your hands, feet, or backside, you might need to adjust your seat height, stem length, seat setback (fore/aft), handlebar height, and reach (how far forward/backward you can comfortably reach the handlebars), stem angle (how far the handlebars turn down or up from level) and saddle angle (how far forward or backward your pelvis falls).