Tandem(what make)

[jmaccelari]

 

Sorry to whizz on your battery' date=' but your understanding of how a wheel supports a bicycle needs some modification.

...

Therefore your experiment need not concern itself with cornering - a bicycle wheel doesn't know whether it is cornering or just going in a straight line.

[/quote']

Again I take your "knowledge" rather circumspectly.

 

Most of the force is down the line of the wheel, I agree, but there must be some

lateral force (a bike leaning down is still subject to gravity). Also "stiffness" is

a concern when standing and "throwing" the bike from side-to-side - again a lateral

force is involved.

 

If the lateral movement of the wheel is of no importance, then why is the ONLY experiment you quote ad nauseum looking at lateral movement! Unfortunately the

author does not state the amount of lateral deflection measured, only that the

difference between ties and untied is negligible.

 

So instead of (once again) accusing me of being absolutely ignorant when I'm

trying to figure out what's going on and ignoring your biases (which is what I

think is really upsetting you, here), why don't you go figure out how a wheel _really_

works. Touche.

 

Then come back to me...

 

Tying and soldering spokes is an archaic practice with no roots in science.

 [/Quote]

Again your biased opinion without conclusive support...

 

Like I said' date=' cut a spoke and go for a ride. That's all you have to do, not attempt to make the experiment so complex that you know it will never be performed and you will therefore never loose face.

 [/quote']

I'm not the one with the "reputation" on the line, Mr Bornman. I can't loose (sic) face,

since I'm just trying to get a straight answer from someone who knows something.

I'm not prepared to accept your opinion just because your face has appeared on telly.

The broken spoke experiment is (as I stated) reasonably simple. You offered to help,

or are you backing out?

 

I'm prepared to do it by removing a spoke before I have them soldered and then

leaving one out after having the rest of them soldered.

 

And if that is not "empirical" enough' date=' why not find a very, very well-used wheel and see if you can find any evidence of spokes moving in relation to each other, by examining the crossing for evidence of fretting.

 

I'm off to the patent office to go and register a rivet that binds Ksyrium (flat) spokes. Next season it will be all the rage. I already have the marketing value proposition....SpokeRiv: Stiffer, lighter*, stronger.  

 

 

 

 

* lighter than tying and soldering. 

[/quote']

Again you reduce your argument to ridiculing any viewpoint contrary to yours - short

on facts again!

 

So we are reduced to opinions (i.e. guesses).

 

My guesses are:

- cornering (or standing): since the forces are sideways, they will be fairly evenly

  distributed amongst the spokes, so my guess is that no effect will be seen - even

  with a tandem;

- broken spoke: since metal provides both tensile and compressive strength,

  my guess is that a soldered broken spoke will be provided with some support

  and would reduce the amount of distortion at the rim. I have no clue to the amount

  of reduction.

It will also hold the spoke in position so it doesn't knock around. We can debate

whether this is a good thing or not.

 

Has anyone o the Hub had a problem with a broken spoke getting stuck into

something?

 

I have not even thought about the effect or rotational inertia which is coupled from

the rim to the hub via the spokes. This might under turning have some sort of twisting

effect - especially on a tandem with 28C tyres and a heavier rim, since it has to

translate the change in momentum to moving a 150-200kg mass.

 

Can you discuss this rationally or are you just going to throw your toys out the cot

again?

 

[The Pirate]

Me and the wife are riding a black alu TITAN frame that we bought from Cycletech. Put Ultegra groupset on and some ZIPP's. It weighs in at around 12.5 kg and without the wheels it cost us about R 9000.00 It is by far the best value for money. In the racing tandem bunch at the Argus this year we were about 20 to 25 Titan's out of the 75 tandems.Not bad for a "cheap" tandem to be so well represented in the racing bunch.

[RaceChick]

What did it cost you after you put ultegra and the zipp's on?

 

It can't be the best value for money anymore?

[mdk555]

Me and the wife are riding a black alu TITAN frame that we bought from Cycletech. Put Ultegra groupset on and some ZIPP's. It weighs in at around 12.5 kg and without the wheels it cost us about R 9000.00 It is by far the best value for money. In the racing tandem bunch at the Argus this year we were about 20 to 25 Titan's out of the 75 tandems.Not bad for a "cheap" tandem to be so well represented in the racing bunch.

That is good value for money

[cyclenut]

Interesting one from a messageboard on the internet:-

 

5. The captain should remember that he has no pockets any longer ? the stoker simply has front pockets and back pockets. Take care of handing stuff forward (handkerchief' date=' food, etc.) so the captain can focus on captaining.

[/quote']

 

My wife still threatens to velcro all her goodies (bars, lip ice and sun cream) to my back

 

 

[mdk555]

Interesting one from a messageboard on the internet:- 5. The captain should remember that he has no pockets any longer ? the stoker simply has front pockets and back pockets. Take care of handing stuff forward (handkerchief' date=' food, etc.) so the captain can focus on captaining.[/quote']  My wife still threatens to velcro all her goodies (bars, lip ice and sun cream) to my back 

100% correct. I tell my stoker that every 15min they must make sure I have some juice and it is also their job to make sure I eat. Heck, I even got my missus to give me shoulder massage just before we climbed Suikerbossie.

[decibach db]

My stoker pushed a banana in my mouth from behind up chapmins peak. I opened a case against him for attempted murder...

 

 

 

 

[decibach db]

Me and the wife are riding a black alu TITAN frame that we bought from Cycletech. Put Ultegra groupset on and some ZIPP's. It weighs in at around 12.5 kg and without the wheels it cost us about R 9000.00 It is by far the best value for money. In the racing tandem bunch at the Argus this year we were about 20 to 25 Titan's out of the 75 tandems.Not bad for a "cheap" tandem to be so well represented in the racing bunch.

 

 

 

Must agree.

 

 

 

We have a Titan with a carbon fork - Cost R10 000.

 

Bargain!!

 

The only thing I would change in the future is the Tiagra groupset..... but it have to break first.

 

 

 

 

[limosine]

 

You mentioned earlier about the Q-ring. What is this,how does it work,is it only for hills,price,etc,etc,etc ????????

 

[limosine]

My question(Q-ring) is for dedibach---or anybody that wants to help

[RaceChick]

Raleigh Tandem has a carbon fork plus 105 groupset for R 13 950. Then you would not need to upgrade.

[decibach db]

You mentioned earlier about the Q-ring. What is this' date='how does it work,is it only for hills,price,etc,etc,etc ???????? [/quote']

 

 

 

I realy suggest you ride with normal chainrings (blades).

 

Then after 3 months you PM me and I'll come up to Limpopo with my stoker and our Tandem... then you take the tandem for a ride ... and you can give me your honest opinion.

 

 

 

I bought our Q-rings of the hub for R700.

 

Goeie genugtig.... best 700 bucks I ever spent in cycling...

 

 

 

New you would probably look at R1300-R1500?

 

 

 

look at Eliminator's comment... very good...

 

 

 

It makes your powerstroke longer so you and your stoker can have a more even stroke.....

 

 

 

 

 

 

 

http://www.rotorusa.com/frequentquestions.shtml

 

 

 

 

 

Check it out and do PM me... let my know what Tandem you got.

 

Decibach2008-05-12 08:06:12

[mdk555]

My question(Q-ring) is for dedibach---or anybody that wants to help

Vespa, the last some one asked the thread ended up with about 30 pages of fighting but amongs others it is a slightly elipticle shaped gear that eliminates any dead spot

 

 

 

 

Does it work - those who have one swear blind by it - those whose next bike does not have one are unhappy, those who dont have one should ..........get one

[tikki]

Hi

Here is a web site you can check out a few tandem options www.mtbtandems.com , for any advice you can phone Tyrone at the bike shop - plett or email bikesshop@mweb.co.za .Enjoy your day,cheers

[mdk555]

hmmmm.....will try MTB tandem on a gravel rd but single track .......no way.

[limosine]

Check it out and do PM me... let my know what Tandem you got.

 

Dankie decibach ek sal dit doen. Ek het vandag vir my 'n tandem bestel(cannondale).Hulle wag vir 'n besending van oorsee af. sal dit seker eers oor 'n maand kry. Ek sal jou verseker laat weet.

Groete