According to Trek, this creates a more responsive shock, and although it does require extra sealing, there's still a reduction in friction compared to an IFP setup.ĭon't forget, all of this is in addition to the RE:aktiv valve technology that Trek debuted back in 2014, another project that they worked with Penske on to develop. That means there's only a solid column of oil, with no gas charge required. Rather than using an IFP, they've allowed the damper shaft to exit out the bottom of the shock. Trek's Thru Shaft takes a different tactic, albeit one that was first tried by various bicycle suspension manufacturers over twenty years ago. It then returns to its original position once the impact is over and the oil pressure is reduced. That's where the IFP comes in – the oil pushes against it, and in turn the gas below the IFP is compressed. When a bump is encountered, the shock's damper shaft moves through the oil, but that displaced oil needs somewhere to go. The IFP sits in the body of the shock, positioned between a column of oil and a column of gas, typically nitrogen. With a few exceptions, most mountain bike shocks are designed around the use of an internal floating piston, or IFP. That got the conversation started, and wasn't long before Trek had created a rough prototype to see if the concept had merit, which eventually led to partnerships with both Fox and RockShox to create shocks using a Thru Rod-inspired design. Those shocks don't have an internal floating piston - instead, the damper shaft exits the body of the shock during compression. Some of Penske Racing's Indy Car engineers were in attendance, and they began asking Trek's engineers if they had much experience with the Thru Rod shocks used in auto racing. But this see-through version illustrates that it's a little different than your typical Float shock.Īccording to Jose Gonzalez, Trek's director of suspension development, the concept for the Thru Shaft design actually came up right around the time when the first RE:aktiv shocks were launched in North Carolina.
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