Sag Meaning in Cycling

Sag is the amount a bicycle’s suspension compresses under the weight of the rider when they are sitting still.

This is a fundamental setting for mountain bikes with front forks or rear shocks. Sag ensures that the suspension can move both up and down to follow the bumps in the trail. If you have no sag, your wheels will lose contact with the ground when you go over a dip.

Most riders set their sag so the bike sits about twenty to thirty percent into its travel. You adjust this by adding or removing air from the suspension chambers using a special high-pressure pump.

For example, a mountain biker will measure their sag by standing on the pedals in their full riding gear. This ensures the bike handles predictably and provides maximum grip on uneven dirt paths. It is the baseline for a smooth and safe off-road experience.