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You’ve taken a great first step in purchasing a full-suspension E-mountain bike! To get the best performance from your new bike, you’ll want to fine-tune the front and rear suspension components. Full-suspension helps you roll over technical terrain with less effort and it gives you more traction on rough or loose surfaces compared to a hardtail. The suspension setups for Giant off-road E-bikes are the same as those on traditional mountain bikes.
Suspension Terms
Let’s begin with some suspension terminology:
Travel: The amount movement your suspension has or, in other words, the length of the stroke of your suspension. For example, the Full-E+ has 140mm of rear-wheel travel and the Dirt-E+ has 120mm of front-wheel travel.
Fork: The front suspension mechanism on your E-mountain bike.
Shock: The rear suspension mechanism on your E-mountain bike.
Stanchion: The tube(s) of the fork or shock that goes into the “lowers” on the fork and the body of the shock.
O-ring: A rubber ring around the fork or shock stanchion that is used to measure the sag.
Sag: Compression of the fork and/or shock caused by the rider’s static weight. Performing a sag test is how you set the air pressure in your fork or shock. Ideally, you want to set your sag at about 25-35% of the total travel.
Spring Rate: The amount of force required to compress the spring. This can be the air pressure in the shock or the spring rate of the coil.
Compression Damping: Some forks and shocks have the option to control the flow of oil in the internals of your suspension. The more compression damping you use, the firmer the shock or fork will feel.
Rebound Damping: The rebound adjustment controls the speed at which your fork or shock returns to natural position. The more rebound damping you use, the slower the fork or shock will return to its natural position.
How to Set Sag on a E-Mountain Bike
Tools
To set your suspension in a proper way, you need some tools to get the best results out of your suspension.
Procedure
Adjust Rebound Damping
You’re halfway there. Now that your suspension feels just right with your given weight under compression, it needs to be adjusted properly so that it rebounds at the correct rate. These settings are just as important as the previous step. To properly adjust the rebound damping on your fork and shock, perform this procedure:
A faster rebound damping is normally better for smaller bumps, while slower rebound feels better on big bumps. Make sure that the rebound feels right for your riding style and your specific terrain. Test your bike frequently to find out what setup is best for you. You can check the rebound by compressing and releasing the shock (by pressing down on the saddle) and the suspension fork (by pressing down on the handlebar. Make sure you are not holding onto the handlebars or saddle, but instead pressing with open hands to get an accurate feel. Your suspension should return to its natural position quickly, but not so quickly that it bounces your tire off the ground. Add or subtract clicks as needed.
The best way to determine your proper rebound is to really pay attention while riding. If you feel like your bike is trying to eject you when you land a jump or drop, or your ride feels really rough over technical terrain, you might want to slow down your rebound/ add more rebound damping. If you feel like your suspension is “packing up” (not returning to its natural position when riding over several bumps in quick succession), then you will want to speed up your rebound.
Use Compression Damping
How can you benefit most from compression damping? Consider that high-speed compression is more adequate for fast and rough hits. Low-speed compression damping is better for slower hits. In the end, it all comes down to what settings work best for you and your specific riding style and trail conditions.
Additionally, there are many different variations of compression damping found on both forks and shocks. You may find a high-speed, low-speed or lockout compression damping option—or any combination in between—on your specific product.
With compression damping, you can control the speed of the compression. With more compression damping, your suspension will feel firmer, which means you won’t find yourself blasting through the travel with small impacts or when braking. However, with too much damping, the suspension cannot absorb large impacts--which can result in a harsh feeling.
The correct compression damping depends on personal preference and the terrain. Some riders like a plush, supple bike while others who ride rough trails with big hits prefer a firmer feel.
Suggested starting air pressure for setting sag.
The below overview gives you some insights in fork and shock pressures that you can use as a baseline. The measures differ based on the shock that your E-bike is equipped with. Again, these are just guidelines. In the end, the feeling that you prefer is most important.
O-ring Position