Rock Shox Pro Deluxe Service Manual4/29/2021
Servicing SRAM components often requires advanced bicycle knowledge along with the use of special tools and fluids used for service.We encourage you to contact your dealer before servicing any SRAM product.
![]() Muscled up forks with bigger and burlier chassis have entered the arena, throwing down the gauntlet to the skinnier forebears. We put 9 of the best 170 mm suspension forks to the test to find out which comes out on top. Yes, there have been small revisions to some of the leading forks, but there has been nothing groundbreaking. This year, instead of small evolutionary steps, some brands have taken a giant leap. Of course, we mean the two suspension giants FOX and RockShox who have both released their new 38 mm platforms to complement their existing 35 and 36 mm enduro offerings. Alongside the new Manitou Mezzer PRO, these bigger and burlier forks have made us ask whether stiffer forks are better. ![]() To lessen the impact of trail obstacles by absorbing their energy through its compression. The damper helps control the speed at which the suspension can compress and extend. The spring stores the energy, releasing it when the fork extends, while the damper converts excess energy to heat. The stiffness of a spring is defined by its spring rate, the ratio of force per distance the spring is compressed. Coil springs are linear, meaning that the amount the coil compresses under a given load is identical no matter where the spring is in its travel. Some manufacturers now make progressive-rate springs with varying coil spacing, requiring more force to compress the spring the same distance at the end of the stroke than at the beginning. By far the most popular choice, most mountain bikes now come fitted with air sprung forks. Under compression, the fork lowers push an internal air piston up against the air in the chamber, reducing its volume and increasing the pressure. ![]() Unlike coil springs, air springs have a progressive spring curve, the amount of force required to compress the spring increases exponentially through the stroke. The advantage of air springs is that their spring rate is defined by the air pressure in the air chamber, therefore they are easily adjusted by the user using a simple pump. The breakaway force is the sum of the forces of the static friction of the seals and the pressure in the positive air chamber against the air piston. To reduce the breakaway force, either pressurised air or a coil spring can be added behind the piston to oppose the main air chamber spring and counterbalance the breakaway force. Most air negative air-springs use a valve or bypass dimple to equalise the pressure in the negative and positive spring, so the initial pressure on either side of the air piston is the same. Like the air spring, the damper is a chamber containing a piston that can move up and down, actuated by the movement of the suspension. Unlike the air spring, the chamber is filled with damping fluid, usually some kind of oil. When the damper is compressed, the volume of the immersing shaft displacing some of that oil, forcing it through the adjustable orifices of the compression damper located at the top.
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