HOW TO ADJUST MY DUNE
To tune the suspensions of the Dune up is a fast and simple process which will only take a few minutes. We recommend you to read all this with attention in order to take the maximum profit of the bicycle.
Dune’s Zero system is configured to obtain the optimum performance with a minimum of 30% SAG over the rear shock, being the recommended 35% of SAG, in order to get the most of all its advantages. All the virtues of the system, including the pedalling efficiency, are configured to get these initial adjustment values: 30% to 35% SAG. We will get not only all the performance of the rear suspension but also the pedalling efficiency will be higher.
Dune’s Zero system is configured to obtain the optimum performance with a minimum of 30% SAG over the rear shock, being the recommended 35% of SAG, in order to get the most of all its advantages. All the virtues of the system, including the pedalling efficiency, are configured to get these initial adjustment values: 30% to 35% SAG. We will get not only all the performance of the rear suspension but also the pedalling efficiency will be higher.
WHAT IS THE SAG?
SAG is the name given to the portion of the rear shock that is compressed when we get on the bike, this part that is compressed will change depending on the cyclist weight, and this is what we should adjust by adding or removing air from the main part of the rear shock. There are two different ways to measure the SAG:
When we talk about a 30% SAG what we mean is a 30% “rear shock compression” of the real travel taking as a reference the same piston of the rear shock. The total travel of the rear shock Fox DHX Air of Dune is 63.5mm, so a 30% would be 19mm, whereas the 35% would be 22mm. This would be the distance that would have to be left between the rubber ring and the body of the rear shock once we get out of the bike.
We measure the 30% SAG (rear shock compression) in relation with the total length of the rear shock. Therefore, if the rear shock measures 215,85 between the axles, and we take off the corresponding 19mm of the 30% from the piston travel, we get that the rear shock, compressed by the cyclist weight, should be 196,85mm between both sides.
SAG is the name given to the portion of the rear shock that is compressed when we get on the bike, this part that is compressed will change depending on the cyclist weight, and this is what we should adjust by adding or removing air from the main part of the rear shock. There are two different ways to measure the SAG:
1 By the rubber ring placed in the rear shock piston.
When we talk about a 30% SAG what we mean is a 30% “rear shock compression” of the real travel taking as a reference the same piston of the rear shock. The total travel of the rear shock Fox DHX Air of Dune is 63.5mm, so a 30% would be 19mm, whereas the 35% would be 22mm. This would be the distance that would have to be left between the rubber ring and the body of the rear shock once we get out of the bike.
2 By the measurement bar included in each Dune. See pictures attached.
We measure the 30% SAG (rear shock compression) in relation with the total length of the rear shock. Therefore, if the rear shock measures 215,85 between the axles, and we take off the corresponding 19mm of the 30% from the piston travel, we get that the rear shock, compressed by the cyclist weight, should be 196,85mm between both sides.
This measure system is the same with all the bicycles in the market, the only change is that with Dune the optimum values are from 30 to 35% whereas with the rest of bicycles use to be between 20 and 25%. This change is the key part within all the advantages the Zero system offers.
Three steps adjustment:
1 Get on the bike with the rear shock in the position as it comes by default (aprox 150psi) put both feet on the pedals and seat, then, lean on a wall and place the “measurement bar” between the screws that hold the rear shock.
2 Check if the rear shock gets compressed more or less from the length that the bar indicates.
3 Adjust the air pressure of the main chamber of the rear shock till the bar matches the screws of the rear shock.
The normal values of pressure will range between 130 and 140psi for 60kg, up to 180-190psi for 100kg of the cyclist weight.
You can also measure the SAG by taking the rubber ring placed in the piston of the rear shock as a reference without requiring the "measurement bar". See point 1.
The expert cyclists will be able to regulate the air pressure from the expansion chamber to get more progressivity or a lined-up system, the initial pressure of 150psi in this chamber is a good compromise for a rider of 70-75kg.
Important: For the correct balance of suspensions and to get a perfect geometry we should regulate the front fork with a minimum of 20-25% SAG too. We will get this by compressing the fork with our weight a minimum of 30mm from its total travel (160mm) same way we did with the rear shock.
You can also measure the SAG by taking the rubber ring placed in the piston of the rear shock as a reference without requiring the "measurement bar". See point 1.
The expert cyclists will be able to regulate the air pressure from the expansion chamber to get more progressivity or a lined-up system, the initial pressure of 150psi in this chamber is a good compromise for a rider of 70-75kg.
Important: For the correct balance of suspensions and to get a perfect geometry we should regulate the front fork with a minimum of 20-25% SAG too. We will get this by compressing the fork with our weight a minimum of 30mm from its total travel (160mm) same way we did with the rear shock.