Shock Therapy Ride Height Chart

Understanding and Using a Shock Therapy Ride Height Chart

Most people treat ride height like a guessing game. You bolt the shocks on, bounce the bike, and hope the handling doesn't terrify you. A Shock Therapy Ride Height Chart is supposed to remove that guesswork, but honestly, it's only half the picture if you don't understand what's actually happening underneath the numbers on the page. I picked up a chart like this back when I was running a small race shop, setting up bikes for local club riders. The chart gives you sag measurements, preload targets, and sometimes spring rate recommendations based on rider weight and intended use. The problem is that most riders apply it blindly and wonder why the bike still handles wrong. The chart is a starting reference point, not a finish line. You still need to measure, adjust, and verify.

Shock Therapy Ride Height Chart

Here's how it works in practice. You measure your static ride height first. That's the bike sitting on its wheels with no one on it, suspension uncompressed. Then you measure your sag, which is how much the suspension compresses under the bike's own weight plus the rider's weight in riding gear. Total sag is usually split into free sag and preloaded sag. The chart will give you target numbers. For most street bikes, 25 to 30 percent total sag is a reasonable target range. For sport riding, you might drop it toward the lower end of that range. For loaded touring, you might go higher. The chart typically breaks this down by spring rate too. Heavier riders need stiffer springs. Lighter riders need softer ones. The numbers are estimates. A rider who's 200 pounds wearing full leather armor isn't the same as a 200-pound rider in shorts and a t-shirt, because the gear weight changes the effective load on the suspension. I've seen this mess up setups more than once. Someone follows the chart exactly, gets the sag numbers to match, and then realizes the front end feels vague and the rear end wallows in corners. The chart didn't account for the fact that they're carrying 15 pounds of gear and the springs were chosen without factoring that in. One edge case that genuinely bit me: a customer brought in a BMW R1200GS with an aftermarket shock and a chart from the manufacturer. He had dialed in the sag perfectly according to the chart. Free sag was 30 millimeters. Preloaded sag was 80 millimeters out of 300 millimeters of travel. Everything looked correct on paper. The bike, however, felt like it was swimming through everything. Turns out the shock was a dual-rate design and the chart was written for a linear-spring version. The progressive rate changed how the suspension actually behaved under hard cornering loads, even though the static sag numbers matched. We ended up swapping to a linear spring shock and the handling improved noticeably. The chart couldn't have warned him about that because it wasn't built for his specific shock configuration.

When you're actually using the chart, here's the workflow I recommend. Get a proper sag measuring tool or at minimum a long ruler with a hook. Measure free sag with the bike on its side stand first, then kick it onto the center stand or have someone hold it upright. The difference between side-stand height and center-stand height matters because the suspension settles differently depending on how the bike is supported. Then measure active sag with the rider in full gear sitting on the bike in a normal riding position, not bouncing up and down. Write all three numbers down. Compare them to the chart targets. Adjust preload accordingly. Test ride. Measure again if the numbers feel off after a few miles because the suspension breaks in slightly. There are limitations to keep in mind. Ride height charts assume you're running stock geometry. If you've changed swingarms, relocated the shock mount, or added a lifting or lowering kit, the chart is no longer accurate for your setup. You need to recalculate or consult someone who understands how the geometry change affects leverage ratios. Also, tire pressure matters more than most people realize. A tire that's 5 psi underinflated changes the effective ride height and handling characteristics enough to throw off your setup. Check tire pressures before you measure anything. Another thing that charts don't address well is temperature. Cold shock fluid is thicker. Valving behaves differently. If you're setting up for a track day in 90-degree weather and then racing in 50-degree weather, your sag numbers and handling will shift. I've seen this happen at road courses where the morning session felt great and the afternoon session felt completely different because the shock fluid heated up and the valving opened differently. It's not a chart problem. It's just how physics works.

If your bike has adjustable rebound and compression damping, use the chart as a baseline for sag and then dial in the damping separately. Sag tells you about spring rate and ride height. Damping controls how fast the suspension moves. They're related but they're not the same thing. Mixing them up is the most common mistake I see. Someone adjusts rebound to fix a sag problem and then wonders why the bike bucked over bumps the next day. For a download link, most manufacturers that produce these charts post them on their websites. Shock Therapy, if you're referring to the motorcycle suspension brand, typically provides them through their dealer network or product packaging. If you can't find one, any decent suspension calculator online will give you similar baseline numbers, though the specificity of a branded chart usually accounts for that manufacturer's particular shock designs and valving profiles. Check the brand's official site first. Third-party forums often have archived copies if the link has gone dead. The bottom line is that a Shock Therapy Ride Height Chart is useful as a reference tool, not as a substitute for actual measurement and testing. It gives you a starting point so you're not completely guessing, but the real work happens after you get off the paper and start measuring on your actual bike. Budget some time for it. An hour or two of careful setup will save you a lot of frustration on the road or track.