How to Measure Your Shocks
      Back to home
      1. Shockwarehouse Help Center
      2. Measurement & Fitment
      3. How to Measure Your Shocks

      What Size Shock Do I Need? A Guide to Measuring Shocks

      Here’s how to measure shocks properly and what those numbers actually mean.

      Not all shocks are created equal—and if you’re working on a custom setup, lifted vehicle, or anything outside of stock geometry, you’ll need to measure before you buy. Ordering the wrong length can limit your suspension travel or cause damage, so it’s worth getting right the first time.

      Key Shock Dimensions

      Every shock has three critical measurements:

      • Extended Length – The length of the shock fully extended, from center of mount to center of mount.

      • Compressed Length – The length when fully compressed.

      • Travel – The difference between extended and compressed lengths (i.e., how far the shock can move).

      Why These Numbers Matter
      If your shocks are too long, they’ll bottom out your suspension or pull apart at full droop. Too short, and you won’t get enough travel—which means a harsh ride and possible damage when the suspension tops out.

      How to Measure Your Current Shocks

      If you’re replacing existing shocks and they’re still on the vehicle:

      1. Park on level ground and measure the distance from the center of the upper mount to the center of the lower mount.

      2. Record that length. This is your ride height measurement.

      3. From there, compare with shock specs to find a model that matches your suspension at ride height, but also allows room for both compression and droop.

      If your shocks are off the vehicle:

      1. Compress the shock completely and measure from mount to mount = Compressed Length.

      2. Pull the shock fully extended and measure again = Extended Length.

      3. Subtract compressed from extended = Travel.

      Mount Type Matters Too

      Make sure to note your shock’s mount style:

      • Eyelet (loop)

      • Stem (threaded post)

      • Clevis

      • Bar pin

      If you’re building a custom suspension, this will affect what options are available to you.

      What If You Don’t Have Existing Shocks to Measure?

      No problem. Here’s a basic method:

      1. Jack up the vehicle and let the suspension hang. Measure mount-to-mount = Max extended length.

      2. Compress the suspension fully (removing the bump stop if needed). Measure again = Minimum compressed length.

      3. Pick a shock that fits within that range while maximizing travel.

      Still Not Sure? We Can Help

      At Shockwarehouse, we carry a huge variety of lengths and mount styles for trucks, SUVs, RVs, and more. If you’re unsure, send us your measurements or vehicle info, and we’ll help you match the perfect fit.