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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 10-31-06, 02:34 PM   #1
tomn
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Tell Me About Your Top Tube ~ Please

Hello,

Please tell me the diameter and shape of your top tube.

Thanks for your help
Tom
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Old 10-31-06, 04:05 PM   #2
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Quote:
Originally Posted by tomn
Please tell me the diameter and shape of your top tube.
Why just the top tube?
Road or off-road tandem?
Brand & model info?
Do you care what the frame material is?
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Old 10-31-06, 04:29 PM   #3
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The survey is for the Click-Stand, the folding portable kickstand that I am making & selling:

It works well with singles or tandems that have 1" or 1 1/8" top tubes, but I would like to adapt to fit others.

Hope that makes more sense,
Tom
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Old 10-31-06, 06:33 PM   #4
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Trek T2000 measures out at at about 1-5/8 O.D. Let me know when you've got something that will fit.

I used to do sales and product development in the boating industry. We had a number of items that would have to be adaptable to fit on more than one diameter tube size. Look around the marketplace and you should be able to find 2 or 3 or 6 different methods to make your product adaptable to multiple tubing diameters within 1,2 or 3 ranges.
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Old 10-31-06, 06:51 PM   #5
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Burley aluminum -- crude measurement -- 1.75 inches. I would say it is round in shape.

Last edited by DaveB1234; 10-31-06 at 07:23 PM.
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Old 10-31-06, 07:06 PM   #6
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nobody is going to buy that and carry it around with them.
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Old 10-31-06, 07:15 PM   #7
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Good luck with that....

Erickson Signature: 1 - 7/16" ovalized
Erickson S&S Custom: 1 - 7/16" round
Ventana El Conquistador: 1 - 7/8" round
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Old 10-31-06, 07:54 PM   #8
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Originally Posted by TandemGeek
Good luck with that....

Erickson Signature: 1 - 7/16" ovalized
Erickson S&S Custom: 1 - 7/16" round
Ventana El Conquistador: 1 - 7/8" round


Wow TandemGeek, nice bikes! I met Glen Erickson at a tandem ralley one year. I showed him the tandem I made; he is my idol!
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Old 10-31-06, 08:11 PM   #9
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Round 1 5/16"
I think it is an interesting idea. Consider a small bag with velcro type straps to attach it to one of the tubes for storage.

Jack
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Old 10-31-06, 08:20 PM   #10
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Cannondale RT1000: Round 1-5/8 "

Nice idea. Good luck!
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Old 10-31-06, 10:43 PM   #11
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1 5/8" carbon fiber on a Zona tandem. Suggest telescoping that wand instead of sections.
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Old 10-31-06, 11:48 PM   #12
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About 1 1/2" on aluminum Soverign Tandem and 1 1/4" on Cabrio Steel Triple, both Santana. Good luck with your product.
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Old 11-01-06, 07:05 AM   #13
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dude, you want it compatible with the largest cross section of bikes, make the attachment "cradle" semi-flexible and closed with something elastic. Free engineering advice from Dr. ElRey
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Old 11-02-06, 09:24 AM   #14
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Nice idea! I think you'll need a non-slip foot. And wheel flop on a tandem is usually what makes them unstable. So one of those front wheel clips is probably advisable too. A two-legged "scissors" stand with rubberized fork at the top would eliminate the need for top tube adjustability and provide more stability for working on the bike or getting into rack packs.

Good luck!
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Old 11-02-06, 11:27 AM   #15
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Quote:
Originally Posted by rjberner
Nice idea! I think you'll need a non-slip foot. And wheel flop on a tandem is usually what makes them unstable. So one of those front wheel clips is probably advisable too. A two-legged "scissors" stand with rubberized fork at the top would eliminate the need for top tube adjustability and provide more stability for working on the bike or getting into rack packs.

Good luck!


Actually the only time I have had a problem with the foot slipping is on very slick surfaces, polished concrete or linolium(sp). Alomost all of the outdoor spots don't pose a problem. You don't angle the stand out much when you lean the bike on it. Here is whole bike in the picture above;



The front wheel always flops because of the bar bag, I just straightened it up for the picture. I think you can see one of the two bungee "parking brakes" that are on the levers. Unloaded just one on the rear works, but loaded, or on a tandem both are needed, or the front wheel can flop & roll sideways. I looked at two legged stands, but they don't work well on slopes. The main idea behind the Click-Stand is to support the bike above the center of gravity, and still fold up to 10" to carry. Under 90 grams as well.

Thanks for your ideas,
Tom
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Old 11-02-06, 11:38 AM   #16
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is there a bike under all them bags????
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Old 11-02-06, 01:22 PM   #17
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is there a bike under all them bags????

You bet! The picture was taken the day before my Aberdeen, WA to the Golden Gate tour. 1083 miles in 20 days. Some fun.
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Old 11-02-06, 04:24 PM   #18
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tomn:
Love the leather covered toeclips and handlebar wrap on that touring bike.
Notice that leather handlebar wrap is coming back, a bit pricey, but good lookin' and long lasting
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Old 11-02-06, 04:57 PM   #19
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Quote:
Originally Posted by zonatandem
tomn:
Love the leather covered toeclips and handlebar wrap on that touring bike.
Notice that leather handlebar wrap is coming back, a bit pricey, but good lookin' and long lasting

Thanks, boy, I feel bad discussing my touring bike here! My wife & I do have a tandem, just no pictures....yet. I am looking at sew on elk hide handlebar wrap. They are from VeloOrange:

http://www.velo-orange.com/elsebarco.html

They sold me the elk hide strips for the toeclips. The Brooks wrap looked a lot better wheen it was new. They have faded a bunch, and I'm not sure what to do about it!

Tom
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Old 11-02-06, 06:49 PM   #20
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Quote:
Originally Posted by ElRey
dude, you want it compatible with the largest cross section of bikes, make the attachment "cradle" semi-flexible and closed with something elastic. Free engineering advice from Dr. ElRey
I was thinking diffrent diameter plastic inserts with different size I.D's to fit the different sized O.D's
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Old 11-03-06, 05:49 AM   #21
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God bless you.
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Old 11-08-06, 09:14 AM   #22
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Quote:
Originally Posted by galen_52657
nobody is going to buy that and carry it around with them.

Sorry, people alreay have. I guess that it isn't obvious that it folds. It is 8" long when folded, and weighs less than 90g's.

Tom
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Old 11-08-06, 09:51 PM   #23
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On the leather handelbar/toeclip wrap fading. There is leather shoe dye on the market. Years ago we had brown leather wrap on bars on our tandem; it started looking discolored so dyed it black, then waxed it.
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Old 11-09-06, 10:43 AM   #24
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Originally Posted by zonatandem
On the leather handelbar/toeclip wrap fading. There is leather shoe dye on the market. Years ago we had brown leather wrap on bars on our tandem; it started looking discolored so dyed it black, then waxed it.

Thanks for the idea, I hadn't thought of other leather products.
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Old 11-11-06, 06:18 PM   #25
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Quote:
Originally Posted by zonatandem
tomn:
Love the leather covered toeclips and handlebar wrap on that touring bike.
Notice that leather handlebar wrap is coming back, a bit pricey, but good lookin' and long lasting
What? No comment about his wooden fenders?
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