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Thu 25 Jun, 2:02 pm UTC

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First look: Delta 7 Ascend road bike

By Gary Boulanger, US editor

Delta 7 is a Utah based company, and one of a handful of bicycle brands showing at the inaugural Press Camp in Sun Valley, Idaho this week.

Delta 7 Sports came on the scene in 2007 with its IsoTruss carbon open lattice tube design, starting with the US$4,895 Arantix mountain hardtail frame. In Idaho, we checked out the new US$5,995 Ascend road bike frame.

With only a few hundred frames produced, the premium-priced Delta 7 line has certainly turned some heads.

The funky frame is made of carbon fibre and Kevlar IsoTruss tubes with carbon fibre lugs, with minimal aluminium where components attach.

The ascend begins with a stout carbon head tube.: the ascend begins with a stout carbon head tube.

According to marketing vice president Lester Muranaka, while the Ascend frame isn't lighter than competing carbon frames, its open lattice construction actually provides superior resilience and damage tolerance characteristics. In short, the IsoTruss is able to isolate impact and prevent damage from spreading beyond the next intersection. Additionally, the redundant structure will balance and carry loads even if a member is damaged.

At first glance, it's easy to be skeptical of the tubing's structural integrity. Muranaka assured us the Ascend frame bends less, twists less (torsion) and flexes less (axial stiffness) than solid surface bike frames of the same weight.

Yes, it's stiff and strong enough to hold you.: yes, it's stiff and strong enough to hold you.

Asked if the frame collects more dirt and is harder to clean than a standard solid tube surface, Muranaka said the contrary is true. A simple frame rinse with a hose will clean things quickly, without any worry of corrosion. Each junction is capped to keep moisture out of the lugs.

According to Muranaka, wind-tunnel results show a net reduction in aerodynamic drag over frames made with a solid surface. Air passes directly through the tube to eliminate what Muranaka calls a vortex behind the tube, outweighing the amount of turbulence caused by "sifting" the air through the open lattice IsoTruss.

The carbon seat tube junction is a lug, lug tyhe head tube and bottom bracket shell.: the carbon seat tube junction is a lug, lug tyhe head tube and bottom bracket shell.

While the initial prototype took nearly 300 hours to produce, Muranaka told BikeRadar production has come down significantly at the Payson, Utah facility.

The patented IsoTruss was developed at Brigham Young University under the direction of Civil Engineering professor David W. Jensen at the Center for Advanced Structural Composites.

A 56cm Ascend frame weighs 1,050g/2.3lbs. Delivery is four weeks, with a US$1,000 deposit. Sizes include 50, 54, 56, 58 and 60cm, and come with a lifetime warranty.

For more information, visit www.delta7sports.com.

User Comments

There are 24 comments on this post

Showing 1 - 24 of 24 comments

  • I can't decide whether it looks cool or is eye-wateringly ugly.

  • Mmmm....next door's got some chicken fence....and I've got some Evostick...Anyone want to buy my new bike?

  • I guess we'll see it on MTBs as well. imagine how much it would weigh when completely stuffed full of British mud!

  • They have had an MTB version in prototype for about 7 years

  • I keep checking to make sure it's not April 1st. It just looks wrong to me. And what happens if you crash the thing? 40mph along the tarmac with a cheese grater between your legs. Ouch.

  • Three obvious plus points aren't mentioned here..

    *The way it doesn't interfere with the back-drop scenery.

    *The fact that you can grate cheese on the move.

    *It's a great solution for riders who like to take their pet rodents with them... I suspect that's the real reason the junctions are capped...no one wants Gerbils nesting in the bottom bracket.

  • hopefully they will come to their senses and inject some carbon fiber to those erm lattice pylon tubes.

  • Hmm... I think I like it. Looks kinda cool. Be a proper bastard trying to clean it though!

  • Apparantly they make tyres too....

  • they showed a similar mountain bike on MBUk a while back, cannot remember the make though

  • How about just having a piece of tensioned wire for a down-tube? And wheel spokes made of carbon straws? And a funny crank mechanism to bring the pedal over the top before you have finished pushing down on the other pedal!

  • Why try and invent the wheel and then justify why it is so much better,but is really a gimmick?

  • That bike is so ugly it makes me want to inject smack into my eyeball

  • I don't think it would last 5 minutes with a fat bloke like me jumping on it...Pork pie anyone?

  • I think it's horrible, sorry...The bamboo bikes are pretty interesting though, if a little heavy...

    http://www.bikebamboo.com/

    deej

  • This seems to tap into primordial survival instinct (or something like that) that tells you that branch isn´t going too hold your weight, despite reasoned arguement being able to prove otherwise. I wouldn´t want to be this companies marketing team!

  • At what speed, does this thing start to whistle..........

  • I think it looks pretty good, OK it's no Colnago but certainly beats the Spesh/Giant/Trek/Scott yawnfest. Shame about the price though, you'd need to have some serious cash to go for that for the novelty factor over one of the more usual uber frame choices.

  • I like it, just don't think I could trust it. The possibilities of storage are endless, especially for key rings.

  • Yep, congrats Delta. You've spent years and hundreds of thousands of dollars coming up with an ugly solution to a problem that never existed in the first place. Who would want to pay such an exorbitant amount of money for a novelty item? Which begs the question, do they make a bike rack for a DeLorian??!!

  • Hope those lattice holes aren't small enough to get your fingers stuck in them :-)

  • Yay - so it's heavier and it's main feature is that it is supposedly better able to handle damage. You could of course just get a lighter boggo carbon frame for $1000 and replace it if it got knackered. Or you didn't like the colour.

  • i'll bet my bike that the Marketing team at Delta are gonna have a tough time sleeping tonight after reading these comments. Be nice guys!

  • Wow. Amazing. 22 comments from people that have never seen it, riden it, or know what they are talking about. I have had the opportunity to demo it several times. First, let me say that the structure is smooth, no "cheese grating." It does not whistle, but according to wind tunnel testing, has LESS drag than a solid frame bike. It is under 2lbs for the 56cm frame, and extremely stiff, and incredibly strong. You can put the bike on its side and stand on those tubes no problem (try that with any other brand). The first time I got on it, I couldn't believe the power transfer from the pedals to the rear wheels. It took two minutes off my best time on a steep 50 minute climb here in the mountains of Utah that I do all the time. After getting to the top, my brother and I switched bikes for a minute and redid the last steep section. His Rubaix Pro with full Dura Ace felt like a wet noodle after being on the Delta 7. I demoed a Cervelo R3 for a weekend after the Delta 7, and the Cervelo had a lot more drag on the decents from its big solid tubing. The Delta 7 felt faster. In the end, I bought the Delta 7 last week. It is also very cool looking in person. There isn't a rider who doesn't snap their head to look at it. I passed two guys on a climb the other day, and once I was ten yards past them, I heard one of them say "now THAT's a BIKE!" It is expensive, but if you want to be as fast as possible, it is worth every penny.

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