When carrying a passenger on your adventure motor, you should increase rear preload to compensate for the additional weight, typically around 60-80kg. Most bikes need 3-5mm more preload to maintain proper ride height and handling. The exact adjustment depends on your passenger’s weight and your riding style. You can check if you’ve adjusted enough by looking at the bike’s stance—it should sit at roughly the same height as when you’re riding solo.
What does preload actually do on your suspension?
Preload adjusts how much your suspension spring is compressed when the bike is at rest. When you increase preload, you’re pushing the spring closer together before you even sit on the bike, which raises the ride height and changes how the suspension responds to weight and bumps.
Think of it this way: your spring has a certain amount of travel available. Preload determines where in that travel range your bike sits when you’re on it. Too little preload and your bike sags too much, eating up suspension travel before you even start riding. Too much and the bike sits too high, making it feel harsh over small bumps.
When you add a passenger, their weight pushes the bike down further into the suspension travel. This affects both comfort and handling because you’re now using more of your available suspension just supporting the extra weight. You’ll have less travel left to absorb bumps, corners, and rough terrain. Proper preload adjustment compensates for this extra weight, returning the bike to its optimal ride height and restoring that suspension travel for actual riding.
How much should you increase preload when carrying a passenger?
You’ll typically need to add 3-5mm of preload to compensate for a passenger, though this varies based on their weight and your riding conditions. A lighter passenger might only need 2-3mm, whilst a heavier passenger could require 6-8mm or more. The goal is to return your bike to roughly the same ride height you have when riding solo.
Here’s a practical way to check: when you’re sitting on the bike in your riding gear, measure the distance from a fixed point on the rear axle to a point on the rear bodywork or subframe. This is your solo “sag” measurement. When you add a passenger, the bike will drop lower. Adjust the preload until you’re back close to your original measurement, perhaps slightly higher to account for the extra weight compressing the suspension during riding.
Your riding style and terrain matter too. If you’re touring on smooth tarmac, you can run slightly less preload. If you’re tackling rough trails or riding aggressively, add a bit more to prevent bottoming out. The bike should feel balanced and planted, not wallowing in the rear or sitting nose-high. Watch for the rear tyre getting closer to the mudguard under normal riding—that’s a sign you need more preload.
What happens if you don’t adjust preload for two-up riding?
Riding with a passenger without adjusting preload leads to several problems that affect both safety and comfort. The most immediate issue is reduced ground clearance—your bike sits lower, meaning you’ll scrape parts earlier in corners and struggle over obstacles that wouldn’t normally be a problem.
Your suspension will bottom out more frequently because you’re already using most of your travel just to support the weight. Every bump, pothole, or dip in the road sends your suspension crashing through the last bit of travel, creating harsh impacts that transfer straight through to you and your passenger. This isn’t just uncomfortable—it can damage suspension components and make the bike unpredictable.
Handling suffers significantly too. The rear squats down, which steepens the steering angle and shifts weight distribution forward. This makes the bike feel nervous and twitchy at the front whilst the rear wallows and feels vague. You’ll notice increased tyre wear, particularly on the rear, as the improper suspension position changes how the tyre contacts the road. Braking distances can increase, and the bike becomes less stable under acceleration. Your passenger will feel every impact more harshly, making for an uncomfortable and potentially unsafe ride.
How do you physically adjust preload on most adventure bikes?
Most adventure motors use one of four common preload adjustment systems on the rear shock. The most basic is a threaded collar with locking rings that you adjust using a spanner or specialised tool. You’ll see two rings (or a ring and collar) on the shock body—loosen the locking ring, turn the adjustment collar to raise or lower the spring seat, then tighten the locking ring again.
Many bikes have a hand-adjustable collar with a knurled edge or built-in tool slots. You can usually adjust these without tools by loosening the lock ring with your fingers or a simple hook spanner, turning the collar, and re-tightening. Count the clicks or turns as you adjust so you know exactly how much you’ve changed.
Higher-end bikes often feature remote preload adjusters—a knob or dial mounted somewhere accessible, usually near the shock or on the bodywork. Turn the adjuster clockwise to increase preload, anticlockwise to decrease it. These systems typically show numbers or clicks to help you track adjustments.
Electronic suspension systems found on premium adventure bikes let you adjust preload through the bike’s menu system or a dedicated button. Select the two-up riding mode or manually increase the rear preload setting. The system adjusts automatically. Whichever system your bike has, always make adjustments with the bike upright and unloaded for accurate results, and adjust evenly if you have dual adjusters.
Should you adjust both front and rear preload for a passenger?
You should primarily adjust the rear preload when adding a passenger, as that’s where most of the extra weight sits. A passenger typically adds 60-80kg directly over the rear wheel, whilst the front suspension sees minimal additional load. For most riding situations, rear adjustment alone is sufficient to maintain proper bike balance and handling.
However, there are situations where front preload adjustment helps. If you’re carrying significant luggage on the front of the bike in addition to a passenger, or if you notice the front end feels too soft and vague after adjusting the rear, adding a small amount of front preload can restore balance. The front typically needs much less adjustment than the rear—perhaps 1-2mm compared to 3-5mm at the back.
Watch how your bike behaves after adjusting the rear. If the steering feels light or the front end dives excessively under braking, a slight front preload increase can help. The goal is to maintain the bike’s geometry and weight distribution close to what the manufacturer intended. When both ends of the bike work together properly, you’ll have confident handling, good ground clearance, and comfortable ride quality for both rider and passenger. If you’re unsure, start with rear-only adjustment and only modify the front if you notice specific handling issues.
Need help with custom suspension setup for two-up adventure riding?
Whilst preload adjustment handles basic two-up riding, professional suspension tuning takes your adventure motor’s performance much further. If you regularly carry a passenger or find yourself constantly adjusting settings, a properly customised suspension setup makes a significant difference to your riding experience.
We specialise in creating suspension solutions tailored to how you actually use your bike. Standard preload adjustment only changes spring position—it doesn’t modify damping, spring rates, or other factors that affect how your suspension performs under varying loads. Our suspension systems are designed for riders who demand more than factory-standard components can deliver, whether you’re touring two-up across continents or tackling challenging off-road terrain with a passenger.
Custom suspension tuning accounts for your weight, your passenger’s weight, riding style, typical terrain, and luggage loads. We can set up your bike so it performs properly across all these conditions without constant adjustment. If you’re tired of compromising between solo and two-up performance, or if you’ve adjusted your preload but still aren’t happy with how your bike handles, get in touch with us. We’ll discuss your specific needs and explain how a properly sorted suspension setup transforms your adventure riding experience.
Frequently Asked Questions
How do I know if I've added too much preload when carrying a passenger?
If you’ve added too much preload, the bike will feel harsh and skittish over small bumps, and the rear tyre may lose traction more easily. You’ll also notice the front end feels heavy and the bike sits with a noticeably nose-down attitude. The suspension should still move smoothly over small bumps—if it feels like you’re riding on a rigid frame, back off the preload adjustment by 1-2mm until you find a comfortable balance.
Can I just use a stiffer spring instead of constantly adjusting preload for two-up riding?
Yes, fitting a stiffer or dual-rate spring is an excellent solution if you frequently switch between solo and two-up riding. A properly rated spring for your combined weight means you’ll need minimal preload adjustment regardless of whether you’re carrying a passenger. This approach provides better suspension performance across all riding conditions compared to maxing out preload on a spring that’s too soft for two-up use.
Do I need to adjust my preload back down after dropping off my passenger?
Absolutely—you should return your preload to your solo setting once you’re riding alone again. Leaving it set for two-up riding when solo will make your bike sit too high, resulting in harsh suspension action, reduced traction, and poor handling. It only takes a few minutes to adjust, and keeping track of your settings (count clicks or turns) makes switching between configurations quick and easy.
What if my preload adjuster is already maxed out and my bike still sags too much with a passenger?
If you’ve run out of preload adjustment, your spring is too soft for the combined weight and needs replacing with a higher rate spring. Continuing to ride with maxed-out preload and excessive sag compromises safety and damages suspension components. Consult your bike’s manual for spring rate recommendations or speak with a suspension specialist who can calculate the correct spring rate based on your total riding weight.
How does luggage weight factor into preload adjustment when riding two-up?
Luggage adds significantly to the total weight your suspension must support, so factor it into your preload calculations. If you’re carrying 20kg of luggage plus a passenger, you’re adding roughly 80-100kg total, which typically requires 5-8mm of additional preload rather than the standard 3-5mm. Position matters too—rear panniers and top boxes add weight directly over the rear suspension, requiring more adjustment than tank bags or front-mounted luggage.
Will adjusting preload affect my bike's ABS or traction control systems?
Proper preload adjustment actually helps these systems work more effectively by maintaining the correct bike geometry and weight distribution. However, if your bike has electronic suspension that communicates with other systems, ensure you’re using the manufacturer’s two-up or loaded riding modes when available. Extreme suspension sag from inadequate preload can affect wheel speed sensor readings and reduce the effectiveness of rider aids.
How often should I check my preload settings during a long two-up tour?
Check your preload settings every few days during extended tours, especially if you notice handling changes or if your luggage load varies. Suspension components can settle, lock rings can loosen from vibration, and your perception of proper setup becomes clearer after several days of riding. A quick visual check of ride height and a test of how the suspension feels over familiar bumps takes only minutes and can prevent handling issues before they become problematic.
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