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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 05-09-10, 09:20 PM   #1
act0fgod
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Composite Arts & Science Inc

Anyone know anything about the composite arts and science bikes.

There is one for sale on craigslist and it looks interesting but not able to really find anything about the company or the bikes online.

Craigslist link: http://losangeles.craigslist.org/lgb...731045419.html
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Old 05-10-10, 07:05 PM   #2
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i was hoping someone else would post with some info. I would think that has to be a one off deal, or at least a very limited production deal.
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Old 05-10-10, 10:43 PM   #3
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http://tandem-fahren.de/Mitglieder/C.../builders.html


http://thetandemlink.com/tandems.html


Apparently they were a carbon fiber specialty shop based in Pleasant View, UT and are now defunct.


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Old 05-11-10, 06:51 AM   #4
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I would bet that the frame is very whippy. I'm also thinking that 27 lb weight estimate is rather optimistic. Perhaps both.

But it looks cool in a retro modern sort of way.
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Old 05-11-10, 02:44 PM   #5
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I would be very wary of a carbon frame of dubious parentage. There are too many problems that can be lurking inside (Remember the American Airlines Airbus that lost its vertical tail after departing JFK a few weeks after 9/11?)! One of our local club members was made into a quadrapalegic and a few months later died from complications, when his high end (well known and respected brand) carbon single broke at the junction of the top and head tubes. This occurred while moving along at a good pace on a smooth level road, without warning. Witnesses said that he apparently struck his chin on the stem as he went down. The manufacturer tried to blame the local bike shop for supposedly over tightening the water bottle bolts on the down tube...total crap! This is still being litigated, as far as I know, and nothing definitive has come out as far as cause, but I would bet that there were voids in the layup or perhaps it was not done to the proper number of plies. And this is from a company that is STILL in business and answerable. I would not risk my life on an orphan frame! I have also seen what can happen to a carbon wheelset that has been chipped or cracked.
I have no doubt that some of the larger companies making carbon frames have the technology to have proper quality control, but since this unfortunate incident, I have developed a basic distrust of all things carbon.
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Old 05-11-10, 06:28 PM   #6
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CAS built some radical looking tandems and singles. However they were not light.
Seen lots of photos but never one on the road.

As for c/f failures here is our actual experience:
We currently have well over 25,000 miles on our c/f Zona tandem. Bob Davis is not a 'production' builder, but built each bike (all of them custom) by himself in his shop. He is a retired aerospace guy and worked on the space shuttle.
Can carbon fail? Sure . . . any material can fatigue/fail.
Have broken a steel tandem frame (once at 50,000 miles, and again at 56,000 miles) and one steel tandem fork after 15,000 miles . . .
Just our input.
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Old 05-11-10, 06:29 PM   #7
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Believe it not, the principle behind CAS was granted a patent for his tandem frame back 1993: http://www.freepatentsonline.com/5215322.pdf

CAS first came to my attention about 12 years ago when I saw their first ZXT tandem. CAS / Mark Enders may have built a handful of the frames, as I've seen two or three different ones in photos over the years. The ZXT frames (singles and tandems) seem to be a variation on Brent Trimble's composite 'cross-frame' design of the late 80's.

It would be a great score for a collector or tandem-specialty dealer looking for an example of this short-lived, but very early composite tandem.
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Old 05-11-10, 10:00 PM   #8
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About how much do you guess that this would this go for?


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Old 05-11-10, 11:12 PM   #9
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$4,000 is what he is asking.
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Old 05-12-10, 06:00 AM   #10
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Quote:
Originally Posted by act0fgod View Post
$4,000 is what he is asking.
Lot of money for essentially a museum piece. $4000 buys a nice aluminum tandem with omdern components that is likely just about as light, has a better ride, and comes with a warranty.

Guess it comes down down to how much one values the wow factor.
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Old 05-12-10, 11:53 AM   #11
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I think that for the novelty factor, wooden or bamboo tandems have more of a wow factor than this dated CAS.

Carbon fiber has since been developed into almost a high art form since the early days. The CAS would probably look more fascinating to people who haven't seen any of the more recent tandem designs.


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Old 05-26-10, 04:31 PM   #12
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CAS is one guy, Mark Enders. I worked with Mark for over 10 years at an airbag company here in Utah, and our kids are in the same schools/soccer teams. Before that he worked for the manufacturer of the space shuttle solid rocket motors, hence the composites experience. He also co-founded a twice per week lunchtime road crit at the airbag company that's been going for about 16 years with an average of ~25 riders from all around the area. That's where I learned road racing. It's now a 5 times per week lunch ride, 3 on roadbikes, 2 on mtbs. Wish I still worked there just for that benefit.

He and a coworker rode the tandem on the lunch crit for 3 or 4 years. They always were in it except for steep hill sections. If they attacked from the rear on a tailwind-slightly downhill section of the course, it was a heinous effort to catch their draft. Since then he has always ridden one of his CAS singles, very aero bikes compared to others in that little peleton.

Mark lent me one of his custom tandems when my wife and I were just starting to look for a tandem. I'm guessing the bike was ~36 lbs. The wound-up fork worked well but was not attractive and the components were older (bike was a few years old). At the time I had lots of road miles but didn't know a thing about tandems and didn't appreciate the experience. We went on a 20 mile spin, at the time I had a lot of legs and my wife was a rookie. We started up a short hill and the speed bogged so I stood and went 100% full throttle. ZERO FRAME FLEX! All my power went to the wheels, ride quality and handling were fine. Now with >6k tandem miles on 2 bikes I'm still not very experienced, but our steel santana visa and aluminum trek t2000 are wet noodles compared to the CAS tandem.

Just sharing an interesting experience in the saddle.
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Old 10-28-12, 03:25 PM   #13
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There is still at least one out there on the road. I saw it being ridden two weeks ago while I was running errands near the Silver Creek area of Park City, UT. Easily identified by their unique look. I actually was considering purchasing a frame about 8 years ago. Stiff yet compliant were two selling points. IIRC the CAS website had a few examples that were built up sub 30 lbs.
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