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Delta 7 Arantix Bike

A very wild mesh frameset by Delta 7. Its called the Arantix and the frame made from IsoTruss. The IsoTruss frame uses an open lattice carbon fiber structural design. Pretty wild looking. It would certainly turn some heads when you are out on a ride. Wonder how it rides? What happens on a muddy ride, does it fill it up? It is supposed to light (less material obviously), greater stiffness and resilience (tougher in a crash) and can be tuned (direction specific design). And it looks cool. It thought at first glance it was some sort of wire mesh until you see it up close.

Commentary by Francois:

Ok, I have to say something here. I was going to post about this frame but I’ll just add to pastajet’s post.

This was one of the lowlights of Interbike for me. There’s a bit of hype and there’s big crowds at their booth. I checked it out and walked right out after a couple of minutes.

- This frame is $7000

- It is coyote ugly

- It is so impractical with dirt and debris getting in the frame. On their website, they have the down tube wrapped with plastic.

- How does it ride? What’s the geometry? Nobody knows. And they expect us to buy it for $7000 for the frame? Come on! I’d rather get an Ibis at 1/5 the price and is better in every important aspect.

This seems like a science project gone big. In fact I believe it was a student’s college project. The materials company decided to produce the frame and hired him on. That’s all good but $7000? And how does it ride again?

In the end, Interbike has its inventors and it’s not bad to have these wild products. But I’m no billionaire and I don’t have a wall to hang a frame like this.



Follow up Comments:

Wow, I did not know that is was $7000, thats totally insane. Yes, my Ibis Mojo was a heck of a lot cheaper and is actually a gorgeous fame as opposed sort of butt ugly!  Like I sad this was interesting looking.  Per their website “The IsoTruss frame uses an open lattice carbon fiber structural design concept that was originally developed at BYU under the direction of Prof. David W. Jensen, Director of the Center for Advanced Structural Composites. Tyler Evans, who spearheaded the project at the Center for Advanced Structural Composites at BYU, has been hired by Delta 7 Sports as Program Manager to develop the new frame which will go into production early next year.” Hype most likely, but it would be interesting to take it for a ride.


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  • Tyler Evans says:

    That last post by francois brought out some of the key questions that most people have when they first learn about the Arantix and its IsoTruss technology. I wish I had more time at Interbike to talk with him. My name is Tyler Evans and I designed the Arantix. First, with regard to dirt and debris building up in the frame, we have put a lot of muddy miles on the Arantix since Interbike and we are finding that mud does not build up any more than on any other bike frame. If people are still worried about mud, Lizard Skins has developed an ultra-light 1mm thick mud skin set for the Arantix that comes standard with every frame. The picture on the website that shows a plastic wrap is a shrink tube skin that was only put on the downtube of the original BYU proof-of-concept bike. The Arantix geometry is aggressive, like most XC race bikes. The full geometry specs will be posted on the website as soon as sizes small and large are finalized. So far, all test riders since Interbike agree that it rides very well. We had a 220lb rider who said the rear wheel “tracked beautifully” and an Australian racer who says it is not” harsh or skittish” in the rear wheel and it really digs into the turns. The most reliable reviews will obviously come from the magazines in the near future. The comment about the Arantix being a science project gone big is partially true. Even though I did build the “IsoBike” proof-of-concept bike while I was a researcher at BYU, I did not invent the IsoTruss technology, which has been under intense development for over a decade. Modern Marvels on the History Channel recently named the IsoTruss manufacturing concept as one of the 25 greatest inventions of 2007, out of a field of over 3,000 revolutionary technologies, so it is a little bit more than just some student project. Hopefully we will see Francois at the North American Hand Built Bicycle Show in February and I can answer some more questions.

  • Francois says:

    “Tyler Evans Says:
    October 22nd, 2007 at 4:26 pm ”

    I commend you for replying here on the site. Your viewpoint is very helpful.

    However I remain extremely skeptical. As a bike consumer, it just doesn’t make sense to me how this can justify $7k. I’m riding a Look 986 frame right now that weighs 2.6 lbs, no rider weight limit. It is absolutely gorgeous and it rides like a dream. It’s got Look’s brand and reputation behind it and it costs $2500 for the frame and post.

    Anyway, we can talk for hours too but at this point and this price point, talk is cheap. It’s all about the ride now and the opinions of people who actually buy this frame. And the most reliable reviews don’t come from magazines and manufacturer test riders. They’re actually the least trusted here for one reason or another.


  • Tyler Evans says:

    I agree with Francois that the ride is one of the fundamental characteristic that anybody should consider when comparing any two bikes. I know it may not be very realistic for you, but I want you to know that if you would like to come out to Utah and personally ride the bike, I would love to get the input of an intelligent skeptic!

    As for the price, I know that there is a lot of sticker shock on this frame. The only assurance I can give you is that the price is purely driven by the extremely time-intesive, hand-woven nature of the bike. Each frame has over 300 skilled man-hours involved. It is definitely not a frame for the masses.

  • Andrew G - US PRO says:

    Hi my name is Andrew G, I am a US professional triathlete and I ride an Arantix from Delta7 Sports. The bike is by far the fastest, lightest and most responsive mountain bike I have ever ridden in any condition on the rode or the harshest trail of evil knee deep mud. The frame is perfectly tuned to my every need. There is minimal mud from long 7hr rides in the rain. Using a Power Tap I am able to achieve greater speed and wattage with a lower heart rate on the same course compared to a competeing high end frame. As Tyler puts it, the bike is not for the masses, it is WORLD CLASS AND NOTHING LESS and HAND MADE. The only bike on the road side like this hand built carbon perfection is from Parlee and they dont do mtb. My Arantix is more like an F1 race car that takes you on an adventure your never going to have until you buy or test out. I would not ever ride a different bike. There are very few companies you can call and speak directly to the engineer and builder. The service is like no other, there is no equal to the fine level of craftsmanship and level of detail you will find. I am FASTER ON MY ARANTIX. Oh, it CLIMBS like a MOUNTAIN GOAT on Crack.

    The entire staff at Delta7 is wicked cool as well.

    Ride Happy


  • Allison says:

    Hey, If you have test riden a Delta 7 please share your review, photos and/or videos here:

    Be cool to keep this conversation. Cheers!

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