If I were inclined to bet, I'd almost be willing to wager that this is an idea that's been tried before. It's amazing how many such "marvelous new inventions" turn out to be neither marvelous nor new.
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Werehatrack wrote: The biopace rings were first manufactured by Worthingtons in the 1930's. When everyone who had tried them had stopped cycling they came back. So I would not be surprised to see these come back later.
Mark Hickey said:
The REALLY funny thing was that the Shimano Biopace rings started out really pretty egg-shaped. Then every year, they "improved them" by making them a little rounder. Pretty soon, they had re-invented the round chainring and we were all back where we started.
That's funny! In fairness, there were only Biopace and the rounder Biopace II (each came in 2 quality grades)
Ya gotta hand it to Shoji Onozawa for renaming his 'old-fashioned' SR-Sakae rings "Round Tech" during the Biopace years. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971
"Olebiker" wrote: Take a look at the Web site (clip) ^^^^^^^^^^^^^^^ I just did. They claim that you store energy in the springs at top dead center, and release it at bottom dead center. Evidently this system is applicable only to one-legged riders, since, while the right foot is at top dead center, the left foot would be at bottom dead center, if you had one.
You store energy through the horizontal. You merely commence storing the energy in the example at TDC through 3:00, then you commence releasing it through bdc. I suspect at speed you actually would be releasing energy beyond BDC (TDC on the other arm).
Can anyone explain the need for suspension springs in the chain
rings?
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....and I thought I'd seen it all!
Garry Jones English Cyclist, ResIDING in Sweden
When a mountain climber at high altitude with a heavy pack takes a step, it is a quick step with a rest after that. If you want to lift something heavy you try to do it as fast as you can. You would not try to spend a long time holding something heavy. Sometimes muscles like to to work in small spurts with rests instead of long continuous output. A rider could use this crankset to spin high rpm normally while also having the option to hammer at low rpm. It is not comparable to Biopace. An easier way to get this "suspended chainring" effect is to devise a pulley on a spring tensioned lever on the drive side of the chain. It can always be disengaged for efficient spinning. I have been meaning to try more experiments with this.
On Wed, 02 Feb 2005 22:41:25 +0000, "Just zis Guy, you know?"
may have said:
On Sun, 30 Jan 2005 13:22:26 -0600, Werehatrack <[email hidden]> wrote in message <[email hidden]>:
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Can anyone explain the need for suspension springs in the chain rings?
There isn't one.
I beg to differ. The existence of fools and money, and the well-publicised ease of parting the latter from the former, is surely justification enough.
For that, there is no need to even have a product, as is demonstrated on a minute-by-minute basis on eBay.
-- My email address is antispammed; pull WEEDS if replying via e-mail. Typoes are not a bug, they're a feature. Words processed in a facility that contains nuts.
