Video: Kirt Voreis Tries to Explain Niner's CVA Suspension

May 20, 2019 at 13:34
by NinerBikes  

"The suspension is gonna hit and link in - it's like the planets!" - Kirt Voreis

Going into his third year of riding Niner's CVA suspension, nobody knows better how it works than Niner athlete Kirt Voreis. In the span of a month, puts our bikes through more punishment and random abuse than most riders do in a year. He's given us heaps of feedback on making the new RIP 9 RDO the best it's ever been. And there's no doubt he could tell you what his bike is doing at any single moment on the trail.

But can he actually explain why it works?

Nope. Not at all. Not one bit.

But check out the video. He's giving you his best effort, giving us a laugh, and getting a lot of help with oversimplifying the design, thanks to the disembodied voice of an actor imitating an engineer, plus a sequence of marginally accurate computer-generated animations.

Kirt Voreis sets up for the straight line on Cline Butte.

The CVA system controls unwanted suspension movement with calibrated anti-squat provided by chain force, rather than relying on rear shock compression damping or manual lockouts. At the same time, CVA keeps the suspension active while climbing and descending, thanks to careful pivot placement which effectively tunes the amount of bump input required to overcome the anti-squat.

Niner s Kirt Voreis digs in to one of the many loose corners on Cline Butte.

Niner’s CVA axle path (and hence chain growth) is designed to maximize anti-squat right at the sag point, or within the first 25-30% of suspension travel. Chain tension from pedaling force helps to hold the bike up in its travel, right at the sag point, and prevents it from squatting or bobbing under pedaling load. Furthermore, CVA anti-squat is amplified in larger cogs, which happens to be the gearing most used when a rider is pedaling uphill. This goes a step further in minimizing pedal bob and loss of efficiency, particularly when climbing.

Niner s CVA suspension keeps his RIP 9 RDO planted and predictable.

Beyond the sag point, chain growth and anti-squat are reduced to near zero. The drivetrain is effectively decoupled from the suspension as CVA moves deeper through travel, allowing the suspension full freedom to absorb impacts and track terrain. This keeps the suspension sensitive and fully active while descending.

But don't trust Kirt. We don't.

Just go ride a Niner and see for yourself.

Kirt Voreis charges possibly the only smooth straightaway on Cline Butte.

MENTIONS: @NinerBikes


  • + 38
 Kirt could likely ride a shopping cart in a way that would make it look amazing- easily one of the most talented riders of all time and one of the funnest to watch ride. That said the Niner's are looking pretty sweet and they are lucky to have an ambassador like Kirt to show what is possible (impossible for most) on them.
  • + 32
 Sponsoring Kirt Voreis is the best decision they've ever made. I completely wrote them off before he came along. Bold move, Niner.
  • + 2
 Hey! Ellsworth sponsored Lopes,so....theres that
  • + 20
 The only thing more confusing then listening to Kirt explain CVA would be Installing Cables in a Niner Bike
  • + 0
 this deserves more upvotes
  • + 1
 AXS is the answer.
  • + 16
 Title might as well say "Kirt Voreis stands completely still" and i'd still click it. Honestly.
Witty as always.
  • + 5
 We should have "Angle of the dangle" as a spec on all future bike reviews.
  • + 3
 The angle of the dangle is inversely proportionate to the heat of the meat.
  • + 9
 Cline Butte in full effect.
  • + 4
 I would seriously consider a niner just because of Kirt. Dude is f-in hilarious and an absolute shredder. Big props to niner for supporting him.
  • + 1
 I had a RIP9 and now have a SC Hightower LT. I miss my Niner and particularly how it peddled (especially through chunky loose stuff and short punchy climbs). They make great bikes and I would love to ride their newest RIP9 ASAP.
  • + 1
 I had a first-gen RIP9 for a little while. An full-suspension 29er in 2007 meant long chainstays, flexy pivots and steep head-angle, but dang it did that thing peddle well! I even set it up as a singlespeed for a while and it felt like it lost very little in power transfer compared to my hardtail, even when standing and mashing I can only imagine how great a newer, stiffer RIP9 with modern geometry would be!
  • + 1
 When they said Kirt Voreis explain technical suspension, I emediately started laughing out loud. All I remember Kirk doing is making biking look fun, roosting, tricking winning, and HIS DAMN FINGER UP HIS NOSE always.
  • + 1
 I just want to ride that trail he rides (hoping I’m looking about 10% as good on my bike as Kirt is on his). Trail looks sick!
  • + 3
 My 2016 RIP 9's CVA creaked more than a bed at Motel 6.
  • + 7
 So it's a good ride?
  • + 0
 When one of the most steezy riders out there can't make your shit look good-- cmon Niner, it's getting old! (PS, I'm a Niner owner and lover!)
  • + 1
 @splsce The version before it (150 mm) works with a coil, so I would think this one can also but don't know for sure.
  • + 2
 I wish they could make a frame that doesn't need ribs to be stiff.
  • + 1
 "Shorter chainstays for better geometry". When will this manlet crisis ever end?!
  • + 2
 I preferred Kirt's explanation.
  • + 1
 Why yes Kurt, I do like the angle of the dangle. Please go on.
  • + 1
 Awesome edit. Bike looks sick
  • + 1
 How is this different then giant mestro system?
  • + 1
 Works well with coil?
  • + 1
 Sure looks like it.
  • + 0
 Not a DW link anymore...?
  • + 1
 Niner has been using their CVA system since their first full-suspension bikes in 2006-2007
  • + 1
 I want to ride it
  • + 1
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