The LSC adjuster primarily affects the compression damping during slow speed suspension movements, such as pedaling, g-outs or smooth jump landings. It also affects the wheel traction and harshness or plushness of your bicycle. With a 2. Turn the HSC adjuster clockwise to increase, or counter-clockwise to decrease high-speed compression damping.
The HSC adjuster mainly affects the compression damping during medium-to-fast suspension movements, such as steep jump faces, flat jump landings and square edge bumps.
One of the best setups is to run with as little high-speed compression damping as possible, before and without bottoming. If you are bottoming out but like the way the shock is feeling, try increasing your bottom-out control before increasing your HSC. Bottom-out control affects the final part of the compression stroke. The knob is turned with a 3 mm hex key inserted into one of the holes around the perimeter.
Do not use any other tool to turn the knob — use a 3 mm hex key only! Turn the knob all the way clockwise for the most bottom-out control and counter-clockwise for the least. There are four 4 turns of adjustment. Note: The factory pressure setting for bottom-out control is PSI. The bottom-out control valve provides position-sensitive end stroke damping ; this allows for a seamless transition from small bumps to big drop bottom-outs.
The bottom-out valve is not adjusted directly. Instead, its behavior and performance characteristics are influenced by the air pressure setting in the reservoir, and by the adjustment of the reservoir bottom-out control knob. For more bottom-out resistance, add pounds of air pressure, to a maximum of PSI. Ride your bike and verify the settings before repeating the procedure. Doing this can cause damage to your shock, requiring repairs that are not covered under terms of the warranty.
Shock Travel in. With coil shocks, you need to work with the 25lb or even 50lb increments that springs come in, and adjusting the spring rate means removing the shock from the bike. With the RC4 Air Assist you can add between and psi to the can which effectively increases the spring rate. This works really well, with again noticeably firmer setup with full psi compared to the minimum.
The icing on the cake is blue Air Assist rate dial. Another benefit that air shocks have over coil is that air ramps up progressively as the shock moves through its stroke, which makes harsh bottom outs less likely depending on your frames suspension design. The Air Assist dial expands or reduces the volume of the air assist chamber, meaning that when its set to the smallest it ramps up the support more as the shock is compressed.
At both extremes the difference was again noticeable, and we preferred it all the way closed to give the most progressive setup possible. To start off, it's worth noting that in the last 10 years, most development in mountain bike suspension has focused on improvements on the air side of things.
On trail, enduro and even DH bikes coil shocks were becoming a rarer sight to see up until a few years ago. This was down to shocks such as Fox's X2 making huge jumps in small bump sensitivity and consistency on long descents thanks to larger oil volumes and can size allowing heat to dissipate easier. Rockshox have pretty much abandoned coil when was the last time you saw a Vivid coil on a bike?
This has left the smaller companies such as Push with their and Storia with their EXT to be the vanguard when it comes to coil shock enhancements. Small bump is the same as every other coil we have used - unbeatable. Fast rocky sections the shock stays glued to the ground giving that nice 'heavy' rear end feeling. We've only tested the RC4 on one bike with a progressive-linear ratio so it's hard to make accurate analysis of how a shock performs in the mid-stroke, but it's the bottom out where the RC4 shines.
The air adjust works wonders, and with the can around the middle pressure, but the volume reduced fully it makes even the biggest hits disappear. With a linear linkage design at the end of the travel on a normal coil shock the only way to avoid harsh bottom outs would be to increase spring rate, add compression damping or add a higher viscosity oil. All of these have a negative impact on small bump and the rest of the stroke. There is no climb switch option, so if you want to firm things up for pedaling your only option is to wind on some more low speed compression.
Performance wise the amount of adjust ability on the RC4 means you can set it up just how you want. In many ways the DHX2 could be seen as a step backwards, as the air assist has proven to be so versatile in getting the ride characteristics you want.
When compared to other shocks we've used for a long period, the RC4 comes out pretty much on top on all except weight. Fox get lots of points for having detailed service guides on the website.
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