Fox reversible plush12/8/2023 ![]() ![]() ![]() The brand says that the shorter insert offers a slightly more progressive spring rate but its small size means that it can be run with an additional volume spacer if more progression is required.Īs for fork compatibility, the insert can be bought to suit all Fox forks as well as RockShox forks with a 35, or 38mm stanchion diameter that run the Debonair air spring. The latter of the two is designed to work better for heavier or more aggressive riders or those who ride e-bikes, where the standard sizes’ linearity isn’t totally desirable. The TruTune insert comes in two sizes: standard and short. ![]() This then allows the rider to inflate the fork to a higher-than-usual pressure to achieve good mid-stroke support without having to battle the harsh feel that occurs with high fork pressures. Overall, the idea behind TruTune’s fork insert is that it should increase suppleness, and improve small-bump sensitivity and end-of-stroke absorption resulting in a plushier fork feel. TruTune says that in its field data, a higher charge pressure can achieve lower peak pressure. It’s said that this results in lower pressure at the end of the stroke but higher pressure at the start of the stroke. It gets really techy when we start talking about pressure throughout the travel as this insert makes it possible to increase the charge pressure for more initial stiffness in the travel. We’re told that activated carbon reduces this effect, resulting in more consistent and lower stiffness at varying speeds. The brand says that when air is compressed, it heats up and when air is compressed quickly, as what happens so often in mountain biking, the excess heat doesn’t have enough time to dissipate, which results in a stiffer feel. TruTune also addresses the stiffness of air and how it varies with speed. This is done by employing activated carbon for its ability to absorb air molecules as they’re compressed and desorb them when the pressure drops or the fork extends. It uses very clever science to do the very opposite of volume spacers - effectively increasing the size of the air chamber, making a fork’s spring rate more linear and less progressive. That’s where TruTune comes into the equation. This allows for even more tuning options with the use of volume spacers or bottomless tokens but the mountain biking world has become obsessed with the progression of spring curves. So the more it’s compressed, the more it resists compression. One of the other benefits of the air spring is that it’s naturally progressive. Riders can tune their suspension to suit their weight with just a shock pump, rather than get into the insides of the fork and swap coil springs for a pricy replacement. Firstly, they’re lighter than their coil-sprung counterparts but they also provide much more adjustment, and that adjustment is very easy to access. ![]() Most suspension forks on the market use air springs and with good reason. TruTune MTB Air Fork Insert - Technical details How to set up your mountain bike suspension - suspension set-up explained.Busting those suspension myths with Fox.9 tips to keep your suspension running sweeter for longer.If you’re a lighter rider struggling to get full travel out of your fork or you’re looking for a coil feel without dropping the cash on a new fork, look no further. While it might not be for everyone, it increases front-end grip, performance and small-bump sensitivity. TruTune is a cartridge that replaces your fork’s volume spacers to make its spring curve more linear. ![]()
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