Compression is a setting on a bike’s suspension that controls how fast it squishes down. When you hit a bump, the fork or shock moves inward to absorb the impact. High-speed compression handles quick hits like sharp rocks or roots.
Low-speed compression manages slower movements like your weight shifting as you pedal or brake. Adjusting this allows you to find a balance between a plush ride and a supportive one. If the compression is too soft, the bike might feel bouncy or dive too much. If it is too firm, the ride will feel harsh and vibrate through your hands.
Most high-end suspension systems feature a dial to let you tune this feel on the fly. For example, a mountain biker increases their low-speed compression before a long climb to stop the bike from bobbing. This keeps the bike stable and saves energy while they pedal toward the summit. It is a vital tool for customizing how your bike reacts to the trail.
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