arantix carbon mesh mountain bike by delta 7

**BeanDip4All** · 11-13-2007, 06:18 AM

Didn't see a thread on this yet:

http://gizmodo.com/gadgets/cycling/a...?autoplay=true

the fact that it is see-through would really freak me out. although having a shrapnel resistant bike would come in handy in some of the neighborhoods i have to ride through to get to the gwb!

**Alpine Dreams** · 11-13-2007, 06:32 AM

It would almost match your bamboo bike

**flowtron** · 11-13-2007, 09:11 AM

Thats cool. Damage isolation is a good idea. The shop guy in me sez: It'd be a bitch to clean.

On another note, we did some cf "testing" in the shop yesterday with some beat down cf handlebars: Easton Monkeylite and RF Carbon.
We crushed both stem clamping surfaces in the vice, it took A TON of force (Bodyweight on the end of a cheater bar) to get them almost completely squished in the vice, but when we took them out you could put your weight on the ends of the bar and the crushed clamping surface wouldn't give. The RF bars have a Ti weave reinforcement in the clamping area, I'm not sure about the Eastons, but its def. the strongest part of the bar by a longshot. We crushed the bar down by the grip area, and that piece snapped easily.
Incredibly unscientific, but it makes feel better to know that my cf bar isn't going to snap off at the stem if I overtighten a little bit.

**Arty50** · 11-13-2007, 09:20 AM

"ultra lightweight"

Yeah, until you get 10 pounds of mud caked up in the isotruss.

**likwid** · 11-13-2007, 09:22 AM

Originally Posted by flowtron

Thats cool. Damage isolation is a good idea. The shop guy in me sez: It'd be a bitch to clean.

On another note, we did some cf "testing" in the shop yesterday with some beat down cf handlebars: Easton Monkeylite and RF Carbon.
We crushed both stem clamping surfaces in the vice, it took A TON of force (Bodyweight on the end of a cheater bar) to get them almost completely squished in the vice, but when we took them out you could put your weight on the ends of the bar and the crushed clamping surface wouldn't give. The RF bars have a Ti weave reinforcement in the clamping area, I'm not sure about the Eastons, but its def. the strongest part of the bar by a longshot. We crushed the bar down by the grip area, and that piece snapped easily.
Incredibly unscientific, but it makes feel better to know that my cf bar isn't going to snap off at the stem if I overtighten a little bit.

Put the bar under compression then hit it with a hammer.
Wear body armor when you do this.

**pechelman** · 11-13-2007, 09:24 AM

carbon isotruss structures are awesome
something i was working on for a short while here at work

seems like a quick plastic wrap over the tubes would help out with mud
but of course would make it look stupid.

2nd on the CF bars
theyre super burly and THICK in the important places.
would be really cool if you could cut that bar in half on a bandsaw or something Flowtron and then post up the crossection. theyre generally really burly. (as you so noted in your test)

**uncle crud** · 11-13-2007, 09:45 AM

okay, techno-geniuses,

what is the meaning/root of the term "isogrid"? I get the "grid" part, it's the "iso" that I don't get.

I'd be damned scared at the idea of riding carbon fiber frames at many of my local riding spots, but maybe that's my ignorance. Isn't there a stress riser creation problem when there's a collision between rock and carbon fiber?

flowtron's carbon bar test sounds pretty convincing but likwid's suggestion of compression and body armor scares me a little.

**pechelman** · 11-13-2007, 09:49 AM

iso- is a prefix from the Greek isos, meaning "equal." It is used primarily in scientific and technical terms, such as isometric, isotonic, isonomic, isosceles, and in this case, isogrid.

**Lonnie** · 11-13-2007, 10:19 AM

Originally Posted by Arty50

"ultra lightweight"

Yeah, until you get 10 pounds of mud caked up in the isotruss.

Funny, I was thinking the same thing....

**uncle crud** · 11-13-2007, 10:35 AM

Originally Posted by pechelman

iso- is a prefix from the Greek isos, meaning "equal." It is used primarily in scientific and technical terms, such as isometric, isotonic, isonomic, isosceles, and in this case, isogrid.

okay, but what is equal about the grid? each cell in the grid is of equal size? or each one carries an equal part of the stress/load? or something else maybe?

**pechelman** · 11-13-2007, 10:42 AM

the grid is the same. iso-grid

think of an isosceles triangle

stress on each member is not equal.

id be really tentative about a carbon isogrid bike frame
I can only imagine getting a branch stuck in there or have a rock trapped inside bounce around a ton.

its got great applications for other areas, like aersopace, but I wouldnt want to ride one myself on a trail or really on the road for that matter either.
somewhat surprised they didnt jacket it in one way or another.

**Lonnie** · 11-13-2007, 11:30 AM

And while it wouldn't get (as) dirty, I imagine this would suck for road riding too. (think drag).

**BushwackerinPA** · 11-13-2007, 11:41 AM

court how much money are you making now? bamboo road bike first? carbon MTB next? pretty soon you will be showing up to straightline camp wearing bogner:P.

**BeanDip4All** · 11-13-2007, 11:52 AM

Originally Posted by BushwackerinPA

court how much money are you making now? bamboo road bike first? carbon MTB next? pretty soon you will be showing up to straightline camp wearing bogner:P.

ahem.

i'm not buying this mesh bike or even thinking about it, i just thought it was neat and you sprocket types would have interesting stuff to say about it... which everyone did.

no point to get a mountain bike in nyc. although as soon as move west, i want to get into downhill!

**Alpine Dreams** · 11-13-2007, 11:56 AM

Originally Posted by BeanDip4All

although as soon as move west, i want to get into downhill!

Now your talking!

**scrublover** · 11-13-2007, 12:03 PM

Originally Posted by BeanDip4All

no point to get a mountain bike in nyc. although as soon as move west, i want to get into downhill!

Huh? Dudette, you're pretty damn close to some great riding.

Sprain Ridge, Blue Mountain, Ninham, some other stuff over in N.J. As well as some (supposedly) kick-ass urban stuff in NYC.

**bagtagley** · 11-13-2007, 12:15 PM

Originally Posted by scrublover

Huh? Dudette, you're pretty damn close to some great riding.

Sprain Ridge, Blue Mountain, Ninham, some other stuff over in N.J. As well as some (supposedly) kick-ass urban stuff in NYC.

Not to mention Platekill, Diablo, Jiminy Peak......

**BushwackerinPA** · 11-13-2007, 12:22 PM

Originally Posted by BeanDip4All

ahem.

i'm not buying this mesh bike or even thinking about it, i just thought it was neat and you sprocket types would have interesting stuff to say about it... which everyone did.

no point to get a mountain bike in nyc. although as soon as move west, i want to get into downhill!

its actually very neat

enjoyed watching the video.

**truth** · 04-26-2008, 10:21 AM

Originally Posted by pechelman

iso- is a prefix from the Greek isos, meaning "equal." It is used primarily in scientific and technical terms, such as isometric, isotonic, isonomic, isosceles, and in this case, isogrid.

It's also a really annoying and completely useless measure of quality control. Ironically it takes on it's Greek meaning in that the only thing it assures is consistency, be it consistent quality or consistent crap.

**Mani_UT** · 04-26-2008, 11:04 AM

Isotrusses are a complete joke. It was a joke 10 years ago it is still one today. These guys give a bad name to composites.
I cannot believe how much they hyped that POS bike. I really feel sorry for the guys who is going to buy that thinking it is revolutionnary when it really is garbage.

(To sum it up: NO LOVE FROM ME

)

**lph** · 04-26-2008, 11:44 AM

Originally Posted by pechelman

carbon isotruss structures are awesome

Originally Posted by Mani_UT

Isotrusses are a complete joke.

Oh no, an engineering debate is about to ensue everybody hit the deck.

Pechelman?

**Arty50** · 04-26-2008, 01:17 PM

What's really funny is that this is a classic example of something being over-engineered to the point of being impractical.

If I had this bike on our epic mudfest on Porcy two years ago, I would have thrown it off the side of the rim.

**Sirshredalot** · 04-26-2008, 01:39 PM

That frame is so damn light, though, it has to have some appeal to hardcore XC racer weight weenies.

**Arty50** · 04-26-2008, 01:54 PM

Originally Posted by Sirshredalot

That frame is so damn light, though, it has to have some appeal to hardcore XC racer weight weenies.

Matilda: I became...
Hansel: What?
Matilda: Bulimic.
Derek Zoolander: You can read minds?

DisArray · 04-26-2008, 04:48 PM

Originally Posted by Arty50

What's really funny is that this is a classic example of something being over-engineered to the point of being impractical.

If I had this bike on our epic mudfest on Porcy two years ago, I would have thrown it off the side of the rim.

and you don't think that problem couldn't be solved by some sort of lightweight plastic 'skin'? What makes this thing impractical is the pricetag, but I don't see anything wrong with the concept itself.

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