Rockstar Energy Racing How To: Setting Your Suspension Sag

Join Rockstar Energy Racing mechanic "JT" as he gives step by step instruction on how to properly set up your sag. Setting your sag is key when setting up the ride height of the bike to match the weight of the rider. Finding balance will enhance your bikes performance and will ultimately result better in rides. All you need is four simple tools and the know how presented in this video feature to get your bike tuned in and ready for your next moto.

How's it going? It's JT, here with the Rockstar Energy Racing Shop in Corona, California. Today we're going to talk about setting up your sag.

How to Set Your Suspension Sag covers the following:

Suspension Sag Tools

To set up your sag, you're going to need a few tools:

  • Tape measure
  • Sharpie
  • Hammer
  • Punch

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Setting Your Sag

The purpose of setting your sag is to setup the ride height of the bike to the rider's weight. Our first step in setting our sag, we want to make some measuring points. We use a sharpie to make a mark on the fender and on the swing arm.

We'll make our mark on the front side of the rear fender, and we want to try to keep it in the same spot every time we do it.

Next thing we need is a tape measure so we can check our measurement with our measuring points we just made. We'll check the measurement from the point on the rear fender down to our swing arm, which is 600mm. We'll write that number down; our initial measurement is 600mm.

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Measuring Your Sag

For our next measurement in checking our sag, you're going to have to put the bike on the ground and have the rider sit on it. You'll need a person to hold the bike up while a third person takes a measurement of the ride height. For an accurate sag measurement, the rider needs to be in full gear as he would be on the trail.

Our measurement with the rider on the bike came to 498mm. You subtract that number from the initial number of 600mm to get a final sag number of 102. 102mm is right within our range of 100mm to 105mm.

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Adjusting Sag

If you have more than 105mm of sag, you want to add free-load to the shock spring. We do that by grabbing our punch and our hammer. Once you have your punch and your hammer, you get in between the frame and the shock reservoir. You want to loosen the locking nut on the shock body. The locking nut is the one on the top.

So, you can better see how to set your sag, I have a shock off the bike for you. The first step that you want to do is loosen your lock nut up on the shock body with your punch and your hammer.

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Add or Remove Preload

Once you have your lock nut loose, you want to add preload to your shock spring by turning your spanner ring clockwise. Again, we're adding preload to our spring if your shock number is over 105mm. Once we get the sag number that we want, we'll turn our lock nut back down, take our hammer and punch, and tighten back up. To take away preload, we're going to turn our spanner nut counter clockwise. This will lower our sag number to within our target range.

Here at the Rockstar Energy Racing Shop, we check our sag each time a rider goes out on the track. Once you set your sag, you're ready to go out, too.

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