To prevent bottoming on your adventure motor, you need to increase compression damping, which controls how quickly your suspension compresses under impact. Start by locating the compression adjusters on your shock (usually marked with a ‘C’ or colour-coded), then add 2-3 clicks of compression damping at a time. Test ride on familiar terrain where bottoming occurs, and continue adjusting until harsh bottom-outs are eliminated whilst maintaining comfort and traction. High-speed compression damping addresses sharp impacts like rock strikes, whilst low-speed compression controls gradual compressions from body movement.
What does it mean when your suspension bottoms out?
Bottoming out happens when your suspension compresses fully and runs out of travel, causing the shock shaft to hit the internal bottom-out bumper or the suspension to reach its mechanical limit. You’ll feel a harsh, jarring impact that travels straight through the bike into your body, often accompanied by a metallic clunk or thud sound.
When your suspension bottoms out, the shock can no longer absorb energy from impacts. Instead of the suspension doing its job, the force transfers directly to the frame and your body. This feels dramatically different from normal suspension movement. Rather than a controlled, damped compression, you experience a sudden, harsh stop that can knock you off line or cause you to lose control.
The occasional mild bottom-out isn’t necessarily a problem. If you’re pushing hard on challenging terrain or hit an unexpectedly large obstacle, even properly set up suspension might bottom out once in a while. However, repeated harsh bottoming indicates your suspension settings need attention. Frequent bottoming compromises both safety and comfort, as it reduces traction, causes rider fatigue, and can damage suspension components over time.
Harsh bottoming also puts stress on linkages, bearings, and shock seals. The violent metal-to-metal contact inside the shock creates wear that shortens service life. On your adventure motor, where you’re covering varied terrain with a loaded bike, proper suspension setup that prevents regular bottoming becomes even more important for both performance and component longevity.
How does compression damping actually prevent bottoming?
Compression damping controls how quickly your suspension compresses when it hits a bump or obstacle. Inside your shock, oil flows through valves during compression. The damping circuit restricts this oil flow, creating resistance that slows down the compression stroke. More compression damping means more resistance, which prevents the shock from compressing too quickly and using all its travel.
Think of compression damping as a speed controller for your suspension. When you hit a rock or land a jump, the shock wants to compress rapidly. Without enough damping, it compresses too fast and bottoms out. With proper damping, the shock compresses at a controlled rate that absorbs the impact whilst preserving some travel for additional hits.
Compression damping works together with your spring rate to prevent bottoming. The spring supports your weight and provides the initial resistance to compression. The damping then controls the speed at which the spring compresses. If your spring rate is too soft, even maximum compression damping might not prevent bottoming because the spring simply can’t support the forces involved. Conversely, if your spring is properly rated for your weight and riding style, adjusting compression damping gives you precise control over how the suspension behaves under different impacts.
The relationship between these elements matters on your adventure motor because you’re dealing with varied terrain and load conditions. Proper compression damping helps your suspension work through its travel progressively, using the full stroke without harsh bottom-outs. This keeps your tyres in contact with the ground, maintains control, and prevents the harsh impacts that cause fatigue on long rides.
What are the signs you need to adjust your compression settings?
The most obvious sign is feeling harsh bottom-out impacts when you hit bumps, land jumps, or drop off obstacles. You’ll hear a distinct clunk or metallic thud at the end of the suspension stroke, and feel a jarring impact through the bike. If this happens regularly on terrain that shouldn’t cause bottoming, your compression damping is too light.
Another indicator is feeling every rock and root harshly, as if the suspension isn’t absorbing impacts properly. When compression damping is too stiff, the suspension can’t move quickly enough to absorb sharp hits, so impacts transfer directly to you. This feels different from bottoming out. Instead of a harsh stop at the end of the stroke, you feel harsh impacts throughout the stroke because the suspension isn’t moving freely.
Loss of traction after big hits also suggests compression issues. If your adventure motor bounces or skips sideways after landing a jump or hitting a large bump, the suspension likely compressed too quickly and rebounded harshly. This indicates insufficient compression damping that allows the shock to blow through its travel too fast.
You might also notice your suspension using more travel than expected on moderate terrain. If you’re consistently using 90-100% of your travel on normal trails, you need more compression damping to control the stroke. Most riders should use about 70-80% of available travel during typical riding, with the remaining travel reserved for bigger hits.
It’s important to distinguish compression issues from incorrect spring rate or air pressure. If your bike sags excessively when you sit on it (more than 30-35% of total travel), you need a stiffer spring or more air pressure, not just compression damping. Compression damping can’t compensate for a fundamentally wrong spring rate. Check your static sag first before adjusting compression settings.
How do you adjust compression damping step by step?
Start by locating the compression adjusters on your shock. Most adventure motor shocks have compression adjusters at the shock body or remote reservoir. They’re typically marked with a ‘C’, colour-coded (often red), or labelled ‘compression’. Some shocks have separate high-speed and low-speed compression adjusters, whilst others have a single combined adjuster.
Before making changes, establish a baseline. Turn the compression adjuster clockwise until it gently stops (don’t force it), counting the clicks. Then turn it counter-clockwise to fully open, again counting clicks. This tells you the total adjustment range. Now set the adjuster to the middle of its range as your starting point. Many manufacturers recommend starting at 12-15 clicks out from fully closed.
Make incremental adjustments of 2-3 clicks at a time. If you’re experiencing bottoming, add compression damping by turning the adjuster clockwise (more resistance). If the suspension feels harsh and isn’t absorbing bumps well, reduce compression damping by turning counter-clockwise (less resistance). Small changes make noticeable differences, so avoid making large adjustments.
After each adjustment, test ride on familiar terrain where you experience the problem. Ride the same section multiple times to accurately assess the change. Pay attention to how the suspension feels over bumps, whether you’re still bottoming out, and how much travel you’re using. Check your shock shaft for the telltale o-ring position that shows maximum travel used.
The goal is finding the balance between preventing bottoming and maintaining traction. You want enough compression damping to control the stroke and prevent harsh bottom-outs, but not so much that the suspension feels harsh and skips over bumps. On your adventure motor, this balance becomes particularly important because you need suspension that works across varied terrain, from smooth tarmac to rough trails.
Keep notes on your adjustments and the results. Write down the click settings and how the bike felt. This helps you track changes and return to previous settings if needed. If you make multiple adjustments and lose track, return to your baseline middle setting and start again.
What’s the difference between high-speed and low-speed compression?
High-speed and low-speed compression damping refer to shaft speed, not vehicle speed. High-speed compression controls how the shock responds to rapid shaft movement from sharp impacts like hitting rocks, roots, or landing jumps. Low-speed compression affects slower shaft movement from gradual compressions like body weight transfer, braking, or rolling through gentle dips.
High-speed compression is your primary tool for preventing harsh bottoming from sudden impacts. When you hit a rock or land a jump, the shock shaft moves very quickly. High-speed compression damping provides resistance to this rapid movement, slowing the compression rate and preventing the shock from blowing through its travel. If you’re bottoming out on sharp hits but the suspension feels good otherwise, add high-speed compression damping.
Low-speed compression affects how your adventure motor handles weight transfer and body movement. It controls how much the suspension compresses under braking, how it supports you through corners, and how it responds to gradual terrain changes. Too little low-speed compression makes the bike feel vague and wallowy. Too much makes it feel harsh on small bumps and prevents the suspension from settling into its travel.
These two circuits work together to provide complete compression control. On shocks with separate adjusters, you can tune each independently. This lets you prevent bottoming on big hits with high-speed compression whilst maintaining plush small-bump compliance with appropriate low-speed compression. Shocks with a single compression adjuster affect both circuits simultaneously, though usually with more influence on low-speed compression.
For different bottoming scenarios, adjust accordingly. If you’re bottoming on sharp rock strikes or jump landings, increase high-speed compression. If you’re using too much travel during acceleration, braking, or through rolling terrain, add low-speed compression. If you have both adjusters, start with high-speed compression for impact bottoming, then fine-tune low-speed compression for body movement control.
How can we help you dial in your adventure bike suspension?
We specialise in custom suspension solutions specifically designed for adventure motors and the unique demands they face. Whilst adjusting compression damping yourself works well for fine-tuning, achieving optimal performance requires suspension that’s properly valved and sprung for your weight, riding style, and typical terrain from the start.
Our custom tuning service accounts for all the variables that affect bottoming resistance. We consider your weight with typical luggage load, the type of terrain you ride most often, and whether you’re touring on tarmac, exploring gravel tracks, or tackling serious off-road terrain. This comprehensive approach ensures your suspension has the right spring rate and damping characteristics to prevent bottoming whilst maintaining the comfort and traction you need for long adventure rides.
Professionally tuned suspension systems prevent bottoming through proper internal valving, not just external adjustments. We modify the internal valve stacks to provide appropriate compression damping characteristics throughout the stroke. This gives you progressive resistance that ramps up as you approach full travel, preventing harsh bottom-outs whilst keeping the suspension supple over small bumps. The external adjusters then let you fine-tune for different conditions or loads.
Our suspension products are designed specifically for adventure motorcycles, with features that address the challenges you face. We build shocks that handle the weight of loaded touring, provide control on rough terrain, and offer the adjustability you need when conditions change. Each shock is assembled to your specifications, not pulled from generic stock.
If you’re struggling with bottoming issues or simply want suspension that performs better across all the riding you do, get in touch with us. We’ll discuss your specific situation, recommend the right solution, and set up your suspension to work properly from the first ride. Proper suspension transforms how your adventure motor handles, making it more capable, comfortable, and confidence-inspiring on any terrain.
Frequently Asked Questions
Can I prevent bottoming just by adding more air pressure or preload instead of adjusting compression damping?
Adding air pressure or preload increases spring rate, which helps support weight but doesn’t control compression speed. You need both: proper spring rate to support your loaded weight (check static sag is 30-35%), and appropriate compression damping to control how quickly the suspension compresses under impact. If you’re already at correct sag but still bottoming out, compression damping is the solution. Simply adding more air pressure beyond what’s needed for proper sag will make your suspension harsh on small bumps without effectively preventing bottoming on large hits.
How do I know if I've added too much compression damping?
Excessive compression damping makes your suspension feel harsh and unresponsive, particularly over small to medium bumps. You’ll notice the bike skipping or bouncing over obstacles rather than absorbing them smoothly, reduced traction (especially in corners), and a generally rigid feel. Your tyres may chatter over rough surfaces, and you’ll feel more fatigue because impacts aren’t being absorbed properly. If you’ve eliminated bottoming but the ride quality has become uncomfortable and you’re losing traction, back off the compression damping by 2-3 clicks until you find the sweet spot.
Should I adjust front and rear compression damping equally?
No, front and rear suspension work differently and typically require independent adjustment. The rear shock carries more weight (especially with luggage) and deals with power delivery and braking forces, whilst the front absorbs steering inputs and braking loads differently. Start by addressing whichever end is bottoming out, then adjust the other end if needed. Most adventure riders find they need more compression damping in the rear when loaded with panniers and camping gear, whilst the front may need less aggressive settings to maintain steering feel and front-end traction.
What should I do if I've maxed out my compression damping adjusters and still experience bottoming?
If you’re still bottoming with compression adjusters at maximum, you likely have a fundamental setup issue rather than a fine-tuning problem. First, verify your spring rate or air pressure is correct for your weight plus typical load—improper spring rate can’t be compensated for with damping alone. If your springs are correct, your shock may need professional revalving with stiffer internal valve stacks to provide more compression damping range. This is common for heavier riders, those carrying significant luggage, or riders tackling aggressive terrain that exceeds the shock’s standard valving capabilities.
How often should I readjust compression damping, and does it change with bike load?
You should readjust compression damping whenever your bike’s load changes significantly or when riding substantially different terrain. A lightly loaded bike for day rides needs less compression damping than a fully loaded tourer with panniers, top box, and camping gear. Many adventure riders establish two baseline settings: one for solo/light riding and another for fully loaded touring. Changes in temperature can also affect damping (oil thins when hot), so you might need minor adjustments between summer and winter riding or during long days when suspension oil heats up considerably.
Is it normal to use different compression settings for on-road versus off-road riding?
Absolutely, and many experienced adventure riders adjust compression damping when transitioning between surfaces. Off-road terrain typically requires less compression damping to allow the suspension to move freely over rocks, ruts, and irregular surfaces, maximizing traction and comfort. On-road riding, especially at higher speeds or with aggressive riding, often benefits from slightly more compression damping to control body movement, reduce dive under braking, and provide a more stable, planted feel. The difference might only be 3-5 clicks, but it’s noticeable in how the bike handles.
What's the best way to test if my compression damping adjustments are working?
Use a consistent test loop that includes the terrain where you experience bottoming—whether that’s a particular rough section, speed bumps, or a drop-off. Before riding, push your shock’s o-ring down to the seal, then ride your test section at normal pace. Check how much travel you used (aim for 70-80% on typical terrain, with reserve for bigger hits) and note whether you felt any harsh bottom-outs. Repeat the same section after each 2-3 click adjustment, keeping all other variables constant. Video footage of your suspension movement over the same obstacle can also provide valuable visual feedback on your setup changes.
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