Foes' FFR DH racer looks sharp, considering its intended role as a test mule for a novel extended-negative-travel system.
an up-close and personal look at designer Brent Foe's latest 27.5-inch-wheel DH design and it has a novel adaptation to its Cane Creek DBair damper that adds three inches of negative travel to the suspension. The new FFR uses a basic single pivot swingarm rear suspension that drives its Cane Creek shock through a seat-tube tunnel. Brent Foes then added a sturdy, one-inch-travel damper in-line with the push rod that drives the shock. The second damper device, says Foes, does not affect the suspension in compression, but when the Cane Creek shock extends its top-out bumper, the secondary damper will allow the rear wheel to drop down up to three inches more.
A closer look shows the secondary damper which replaced the push-rod that drives the FFR's Cane Creek shock through the frame's seat tube tunnel. The black rod is the torque shaft for the floating rear brake.
The idea is to keep the rear tire in contact with the ground to maximize braking and cornering. The concept comes from off road moto-racing, where 60 percent or more of the vehicle's suspension travel is negative in order to maintain constant contact with the surface. (Quite the opposite of MTB suspension.)
The FFR is a test bike to explore the possible advantages of a negative travel booster system and Brent outlined that he will be trying damped and undamped cartridges, as well as air-sprung and coil-sprung strategies.
Foes is a believer in single-pivot swingarms that hinge well forward of the bottom bracket axle - it works. A look at Marzocchi's 27.5-inch fork and the FFR's floating rear brake.
Foes applied for a patent on the concept and will be testing the FFR throughout the racing season. The aluminum chassis uses a low-leverage 2.3:1 suspension ratio which delivers eight or nine inches of rear-wheel travel. A floating rear brake ensures that the bike's suspension will remain uncoupled from stopping forces and massive bearings as well as a ball-bearing "scissor" linkage are used to keep the tail of the bike rigid and tracking well. Up front, the FFR is armed with a Marzocchi prototype 27.5-inch fork that we should be seeing a lot of later this year. Brent says that the jury is out on whether the design will make it to production. The concept is valid, however, and even if the FFR does not show up next year in ts present form, in the worst case, the lessons learned will no doubt lead to a second-generation design that will fulfill the potential of an extended negative-travel rear suspension. - RC
It will be super sensitive while its in the negative travel portion but you will only be riding in that when the first shock has fully extended and the second shock is extending out.
With a normal bike if you're off the bike and the bike lift off the ground the rear wheel will come up with the bike as the shock is unloaded and the suspension is already fully extended (if you run extra sag the bike still sits in the same spot with no load so the rear wheel will still come up with the bike as the shock is extended fully. this position is the same regardless of sag.
This bike though when you lift the wheel up the second shock allows the wheel to extend even lower. however the first shock of 9inch is the supporting shock. the bike is not siting 12inchs high. its 9inchs than the other shock allows the wheel to extend past the ground essentially.
Poor explanation haha but hopefully you can make sense of it.
Maybe it's beneficial to allow the wheel to drop but without a spring pushing it to resist throwing weight forward under braking & on steeps? I'm so f*ckin' lost right now. :s
It wasn't made blatantly clear that this bike was 650b right on the home page and, as a result, a lot less unfounded moaning has occurred.
And great job on the typing! you have a bright future ahead of you. Keep it up.
If it works? we will just have to wait and see.