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 motor sport categories for the past few years. Most notably in the offroad category (Rally Raid, Rally Cross, Sprint Car and Motocross) such as the Dakar on Carlos Sainz’ SMG-Redbull car.
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BOS has been using the FCV system quite successfully in motor sports 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 is to meet the needs of mountain bike pilots, represents countless hours of development for BOS. The system was developed over 2 world cup seasons with the experience of world cup pilots 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 will now revolutionize the suspension by acting as a second damper inside the fork. The FCV helps to keep that "BOS feeling" that riders are now accustomed to, while offering a level of comfort and small bumps absorption unseen before with a regular fork.
FCV Closed
FCV Open
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 impacts coming to the fork.
Some noticeable effects expected from the FCV:• A buttery feeling
• Reduction of fatigue to hands and arms
• Better absorption of square hits
• Reduces the risk of pinch flatting and rims denting
• More comfort on braking bumps
• Less nose diving
Look for more BOS models to be equipped with FCV in the coming year.
Newly Redesigned Idylle RaRePrice to be announced soon.www.bosmtb.com
X-Fusion Revel HLR has an MSRP of nearly $1800.
Not sure that counts though...
I got an X-Fusion Metric HLR in fantastic condition for under $700--now that's high performance at a sensible price.
Once you go X-Fusion, you never go back. I'm X-Fusion from the waste down.
Keep bikes mechanical.
The normal action of the fork is pushing oil through the damper (black ring with green sides). What BOS has added is a secondary set of oil ports, shown just below the hex cap in the "open" picture. They are normally closed, covered by a sliding tube (cylinder shape below hex nut). That tube is held up, in the "closed" position, by a very light spring. When the wheel hits the ground, the tube is able to push down on it's support spring very easily, opening the small valves allows the fork to sink a little bit more. After the initial impact, the tube will get sprung back into the closed position, so that the regular damper is controlling things for the rest of the stroke and rebound.
It's a "Smart" Valve because it seperates rider input from the ground input. The bottom of the fork has to be impacted to pull the sliding tube down against the spring. Pushing on your handlebars just pushes the tube against the hex nut, which is the closed position. If you wanted it to operate for both types of input, you would put a lighter secondary spring on the top side of the tube, between the tube and the hex nut.
I gotta say though, attributing a mechanically controlled/actuated part with "intelligence" so that it "knows" when to do what kind of rubs me the wrong way. I get kind of tired of the over pushed marketing BS in the mountain bike world. But hey, if it sells stuff to people who don't know any better then whatever.
fabdemere your comment genuinely made me laugh
That being said, if BOS want to give me an FCV equipped Deville to test out, I'd be more than happy to give it a try!
You mean like computer vs mobile computer patent farce that is stagnating computer innovation these days?
How does something like this compare to the Fox 40 Float FIT RC2?
I have the Fox 36 Float FIT RC2 (can they come up with anymore acronyms ya think) on my enduro and like the tunability.
Is there a decent thread that would give me an understanding of how to decide what fork/shock combo to buy? I can tune it from there, but there are so many bloody options in MTB that wading through all the BS becomes tiresome (so I end up purchasing Fox and call it a day).
have fun meesterlover. if money is not an issue, don`t overlok aftermarket cartridges like avalanche. they really are good.
I agree that given an unlimited budget for exotic materials and proprietary components, on paper the usd design should be better. However given current material technology, in the mtb world (at least in dh) on a performance vs weight scale, the right way up fork still rules the roost. I don't really see that changing anytime soon. Maybe in 5 years, but nothing currently available is even close. (In my perhaps not so humble opinion of course)
And yes before you ask I do have first hand experience with the DVO fork. I managed to twist it in its crowns within 5 minutes of laying eyes on it. Not impressed. Plus the whole stiffener arch thing is plain stupid. They may as well have closed off the back of the arch, chucked a few seals in it and called it a slightly heavy right way up fork...
Also I second Kylehutches point that you should have a good look at Marzocchis Cr380 fork. No first hand experience of it myself but based on Marzocchis recent achievments I expect very very good things from it.
p.s. the boxxer wc air spring is shit. dont bother with it, the r2c2 is a better fork. Fox's 2014 air spring and Bos air spring are quite good.
for reference I personally run a 2014 boxxer r2c2 and hope to upgrade to an avalanche cart when some kind soul decides to hand me 500 dollars or whatever it is they cost.
and on that note i think its time to stick a film on and go to sleep. g'night all.
Here in US I'm not sure who can service or repair in case something goes wrong .
I know I can buy the forks and shoks here in USA.
but they haven't done good job on who can repair or service or get parts like FOX 40,Boxxer etc (get any MTB magazine or hit fox 40 service in google )
I think Bos needs to work on that asap if they want to sell any product anywhere .
well check here as i said nothing new
www.avalanchedownhillracing.com/HSB/High%20Speed%20Blow-off%20System.htm
But with the avy cartridge I thought once it blows off that mid valve is no longer active. I didn't think the mid value worked at the same time as the HSC damper. I saw it more as a 2 stage HSC almost like LSC>mid value>HSC. Or essentially the mid valve been a mid speed compression (jumps etc) Once you have moved past the mid value into HSC if you hit something that is lower frequency the mid value is not longer active because the HSC damper is already working.
This however I saw as a value that remains active at the same time as the HSC damper. So it works like the mid valve but it keep active even when in deep HSC damper.
Or does the avy work the same way?
Thanks for that clarification.
well explained and simple. It sounds like it work like I imagined, should be awesome.