BOS Releases New Idylle RaRe DH Fork with FCV Technology

Another suspension maker to bring certain automotive suspension technology, BOS continues the search for the holy grail combo of small bump compliance and control. Shown at Eurobike last week, we now know a little bit more about what BOS were doing with all that telemetry equipment at the races.

Press Release:

FCV, which stands for Frequency Control Valve, is the latest patented innovation from the engineers at BOS. FCV is a technology that BOS has been using in various motorsport categories over the past few years. Most notably in the offroad category (Rally Raid, Rally Cross, Sprint Car and Motocross) such as in the Dakar on Carlos Sainz’ SMG-Redbull car.

“BOS has been using the FCV system quite successfully in motorsport for a few years now, however adapting it to be a DH World Cup contender proved to be an exciting challenge” said Olivier Bossard, Founder of BOS MTB.

This adaptation of the FCV to meet the needs of mountain bike riders, represents countless hours of development for BOS. The system was developed over 2 World Cup seasons with the experience of World Cup riders and extended use of our data acquisition system in the off season. Until now suspension settings were a compromise between grip, efficiency, comfort, support and shock absorption. The FCV revolutionizes suspension by acting as a second damper inside the fork.

The FCV allows us to keep the BOS feeling that riders are now accustomed to, while offering a level of comfort and small bump absorption unseen before with a regular fork. The FCV is a smart system able to recognize if the compression is coming from the rider’s effort applied to the bars or an impact to the wheel. The Frequency Control Valve makes the distinction between the two, at the same time the FCV will filter a wider range of shocks coming to the fork.

FCV Benefits

• A buttery feeling
• Reduction of hands and arm fatigue
• Better absorption of square hit
• Reduces the risk of pinch flatting and rim denting
• More comfort on braking bumps
• Less nose dive

Look for more BOS models to be equipped with FCV in the coming year.

BOS 2015 idylle RaRe Highlights

• WHEEL SIZE: 26” / 27.5“
• CARTRIDGE: OPEN BATH
• COMPRESSION ADJUST: HI & LOW SPEED
• UPPER LEG: 37mm - AL7075
• STEERER: 1 1/8th
• ROTOR MAX Ø: 203mm
• AXLE Ø: 20mm
• LENGTH (26” / 27.5”): 573mm / 586mm
• TRAVEL: 208mm
• SPRING: AIR
• REBOUND ADJUST: YES
• LOWER LEG: MAGNESIUM
• CROWN: AL7075
• DISC BRAKE STD: PS 160
• OFFSET (26” / 27.5”): 47mm / 56mm
• WEIGHT: 2680g

REDESIGNED CHASSIS
The chassis redesign is mostly due to the increased popularity of the 650B wheel size on the DH circuit. The increased stanchion diameter - from 36mm to 37mm - improves the overall stiffness just enough to counter any extra stress generated by the larger 27.5” wheel size. We also redesigned the casting to improve tire clearance.

INCREASED TRAVEL
The redesigned IDYLLE RaRe FCV now offers 208mm of smooth travel. Even though 8mm seems like a small increase in travel, it‘s all that was necessary to obtain the progressivity we were looking for.

NEW HYDRAULIC BUMP STOP
The IDYLLE RaRe FCV is now equipped with our latest generation hydraulic bump stop. We made a great performing hydraulic bump stop even better. Our World Cup racers were already very impressed with the progressivity of the bump stop. However, tests performed on the test bench showed a visible transition when the bump stop would come into action. The new bump stop features a longer curve and is more progressive to the point of being hard to detect even on the test bench.

NEW AIR CARTRIDGE
The most important change is that the air cartridge is now independent from the stanchion. By the doing this, it allows the fork to flex a little without putting pressure on the air cartridge. The result is a more sensitive and more accurate fork even under stress.

More information at: www.bosmtb.com.