Suspended chain ring

01-30-2005, 09:40 AM

Amazingly, this is not a joke.

http://www.hisingensck.se/texter-bil...G0154_stor.jpg

Can anyone explain the need for suspension springs in the chain rings?

.....and I thought I'd seen it all!

Garry Jones
English Cyclist, ResIDING in Sweden

01-30-2005, 10:09 AM

"Garry Jones" wrote: (clip) Can anyone explain the need for suspension
springs in the chain rings?
^^^^^^^^^^^^^
:-) Very neat design. Serves the useful purpose of turning a profit. If
the manufacturer is lucky, and the bicycling public is gullible, they may
recover their tooling costs. If we're smart, it will go the way of Biopace
chain rings.

01-30-2005, 10:09 AM

"Garry Jones" wrote: (clip) Can anyone explain the need for suspension
springs in the chain rings?
^^^^^^^^^^^^^
:-) Very neat design. Serves the useful purpose of turning a profit. If
the manufacturer is lucky, and the bicycling public is gullible, they may
recover their tooling costs. If we're smart, it will go the way of Biopace
chain rings.

01-30-2005, 10:14 AM

Garry Jones composed the following;:
> Amazingly, this is not a joke.
>
> http://www.hisingensck.se/texter-bil...G0154_stor.jpg
>
> Can anyone explain the need for suspension springs in the chain rings?
>
> ....and I thought I'd seen it all!

I thought there was something like this a few years ago too. The
explanation was something to do with the springs storing energy whilst
on the downward power stroke, and releasing it on the upward return
stroke of a normal pedalling action. This helps, the claim went, to
iron out the power impulses inherent from pedalling. I'd guess this
acts a bit like the 'cush drive' in motorcycle rear wheels.

I can't find a link for it now though.

--
The Caretaker.
[Only registered and activated users can see links. ]
A balanced argument.

01-30-2005, 10:14 AM

Garry Jones composed the following;:
> Amazingly, this is not a joke.
>
> http://www.hisingensck.se/texter-bil...G0154_stor.jpg
>
> Can anyone explain the need for suspension springs in the chain rings?
>
> ....and I thought I'd seen it all!

I thought there was something like this a few years ago too. The
explanation was something to do with the springs storing energy whilst
on the downward power stroke, and releasing it on the upward return
stroke of a normal pedalling action. This helps, the claim went, to
iron out the power impulses inherent from pedalling. I'd guess this
acts a bit like the 'cush drive' in motorcycle rear wheels.

I can't find a link for it now though.

--
The Caretaker.
[Only registered and activated users can see links. ]
A balanced argument.

01-30-2005, 10:18 AM

re: BikeDrive chainrings

It's not a suspension, it's a device to improve efficiency (so
claimed.) It's supposed to even out the power, storing it when then
cranks are horizontal, and releasing it when they're vertical.
Sort of like Biopace with moving parts.

01-30-2005, 10:18 AM

re: BikeDrive chainrings

It's not a suspension, it's a device to improve efficiency (so
claimed.) It's supposed to even out the power, storing it when then
cranks are horizontal, and releasing it when they're vertical.
Sort of like Biopace with moving parts.

01-30-2005, 10:22 AM

On Sun, 30 Jan 2005 19:40:48 +0100, Garry Jones <[Only registered and activated users can see links. ]>
may have said:

>Amazingly, this is not a joke.
>
>http://www.hisingensck.se/texter-bil...G0154_stor.jpg
>
>Can anyone explain the need for suspension springs in the chain rings?

There isn't one.

It's possible that this may have been done in emulation of the
spring-equipped hubs of automotive engine clutch discs, where the
springs have a very definite level of usefulness...but their
functionality here is questionable at best. The human leg does not
engage in the same kind of power production cycle that the piston
engine does.

The mere fact that an idea has no valid basis and is nonsensical in
fact will not prevent some people from spending the money to prove
that it was not a good one...and denying the results.

--
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.

01-30-2005, 10:22 AM

On Sun, 30 Jan 2005 19:40:48 +0100, Garry Jones <[Only registered and activated users can see links. ]>
may have said:

>Amazingly, this is not a joke.
>
>http://www.hisingensck.se/texter-bil...G0154_stor.jpg
>
>Can anyone explain the need for suspension springs in the chain rings?

There isn't one.

It's possible that this may have been done in emulation of the
spring-equipped hubs of automotive engine clutch discs, where the
springs have a very definite level of usefulness...but their
functionality here is questionable at best. The human leg does not
engage in the same kind of power production cycle that the piston
engine does.

The mere fact that an idea has no valid basis and is nonsensical in
fact will not prevent some people from spending the money to prove
that it was not a good one...and denying the results.

--
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.

01-30-2005, 10:32 AM

Werehatrack wrote:

> The mere fact that an idea has no valid basis and is nonsensical in
> fact will not prevent some people from spending the money to prove
> that it was not a good one...and denying the results.

Amazing statement in a thread that's not about helmets....

(yet)

Garry Jones
English Cyclist ResIDING in Sweden