Why?

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Ermm... Maybe?.. No. Ummm...

Hmmm.

?

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

To make money.

--
Keith Willoughby http://flat222.org/keith/
Mae bys Mari-Ann wedi brifo

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Guy

It appears to be a type of cush-drive. That suggests it protects the
drive train from impulses in the driving forces. It might have some
advantages for somebody whose pedalling style involves stamping on the
pedals a lot. Using toe-clips or SPDs would seem a more obvious
solution, though.

On the other hand, the impulses might be generated at the wheels, not
the pedals. Perhaps it's rather good for riding up and down flights of
stairs.

This is all speculation. It looks nicely made, whatever it's meant to do.

--
Joe * If I cannot be free I'll be cheap

"Just zis Guy, you know?" <[email hidden]> wrote in message
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Quoted message said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Cos' they had a few boxes of springs left over?

On Wed, 02 Feb 2005 22:00:42 +0000, JLB <[email hidden]>

Quoted message said:

Quoted message said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Quoted message said:

This is all speculation. It looks nicely made, whatever it's meant to do.

I think you've hit the nail on the head there. That /is/ it's
function, to look flash, techy and expensively well made.

--

Call me "Bob"

"Those who would give up essential liberty to purchase a
little temporary safety deserve neither liberty nor safety"

Benjamin Franklin

Email address is spam trapped, to reply directly remove the beverage.

"Call me Bob" <[email hidden]> wrote

Quoted message said:

you know? said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

To "Increase your efficiency and power", apparently.

Apparently it is all to do with pressure on the pedals too. Now remind me,
do I want my leg force applied to nice big platforms or small SPDs?

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

I agree that it's probably just to make the gullible part with
their cash for something flashy, but since I know nothing about
stunt riding, I'll offer this possible rationale:

Would this be of any use to BMXers and MTBers who do flashy
jumpy-stunt type things?

--
jc

Remove the -not from email

in message <[email hidden]>, Jeremy Collins

(') said:

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Quoted message said:

Quoted message said:

I agree that it's probably just to make the gullible part with
their cash for something flashy, but since I know nothing about
stunt riding, I'll offer this possible rationale:

Would this be of any use to BMXers and MTBers who do flashy
jumpy-stunt type things?

No more than to any other cyclist. Possibly less, because at least the
BMX crowd need very precise control over torque. This would be of
benefit to mashers - people who cannot spin - because the springs will
absorb energy as the cranks are horizontalish - on the downstrokes -
and return it when the cranks are verticalish, thus smoothing out power
delivery. Of course, it's cheaper and more efficient to learn to spin.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/
.::;===r==\
/ /___||___\____
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Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Guy

I suspect the idea is to return the pedal effort on the down stroke to
help through the bottom part of the stroke. Sort of a high tech
biopace. Guess it could also have some use in off-roading is isolating
some of the shocks coming through the cranks that can sometimes bounce
you out of clipless even.

Probably won't work but I've no problem with someone trying it out.

Tony

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Hmmm. Collect the energy when the leg pushes hardest and release it when
the pressure eases? A variant on the principle behind those elliptical
chainrings, working on actual rather than theoretical variability of
pressure in the cycle?

--
Nick Kew

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Similar concept to Rotor cranks, I think.

--

Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/
World Domination?
Just find a world that's into that kind of thing, then chain to the
floor and walk up and down on it in high heels. (Mr. Sunshine)

Call me Bob said:

To "Increase your efficiency and power", apparently.

also:
"BIKEDRIVE makes your crank rotation smoother, rounder and more
efficient."

Smoother I can understand.

More efficient is debatable but still I get the point.

But "rounder"? How can it make your pedalling action "rounder"? Do
conventional cranks change length during the pedal stroke?

d.

davek said:

But "rounder"? How can it make your pedalling action "rounder"? Do
conventional cranks change length during the pedal stroke?

Maybe so the effort put in at any point of the pedal stroke follows a
smoother curve. With conventional cranks there's a spike at the top and
bottom (without being clipped in and pushing laterally as well as down
it's more or less a discontinuity).

However, strikes me as a solution in need of a real problem...

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/

"Just zis Guy, you know?" <[email hidden]> wrote in message
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Quoted message said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_s
tor.jpg

To replace my Biopace chainset, that's why!

Pete

Just zis Guy said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Quoted message said:

Guy

"Compared to a conventional drive system BIKEDRIVE offers more power
output when applying the same amount of pressure on the pedals"

How can it possibly increase the power? It takes energy to compress the
springs, the springs then return less than 100 percent of that energy -
therefore it can only consume power, not increase it.

Peter B said:

"Just zis Guy, you know?" <[email hidden]> wrote in message
news:[email hidden]...

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_s
tor.jpg

To replace my Biopace chainset, that's why!

Don't be silly - combine it with your Biopace. You'll be unbeatable.

--
Joe * If I cannot be free I'll be cheap

"Just zis Guy, you know?" <[email hidden]> wrote in message
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Quoted message said:

http://www.hisingensck.se/texter-bilder/ovrigt/2005/bilder/050129/IMAG0154_stor.jpg

Quoted message said:

Guy

Someone will buy it. Last autumn I met a bloke with a two wheel drive bike.
He claimed he could climb slippery bits more easily. For that supposed
advantage he paid loads of extra cash and carried about 3lb of extra stuff
about with him.

I was very polite and said things like "interesting" "well made" and
"hasn't technology made giant strides".

John

Eatmorepies said:

Someone will buy it. Last autumn I met a bloke with a two wheel drive bike.
He claimed he could climb slippery bits more easily. For that supposed
advantage he paid loads of extra cash and carried about 3lb of extra stuff
about with him.

I was very polite and said things like "interesting" "well made" and
"hasn't technology made giant strides".

Actually, those are supposed to be "not too bad"! The front wheel drive
is geared down slightly from the rear with a freewheel so the front only
engages when the rear slips. Possibly of some use when climbing steep
slippery slopes off-road, or riding on ice.

I prefer the 3x3 trike that appeared in Velovision a short while ago.
Undoubtedly heavy, but a cool bit of kit.

Jon

in message <[email hidden]>, Jon Senior

jon_AT_restlesslemon_DOT_co_DOT_uk ('') said:

Eatmorepies said:

Someone will buy it. Last autumn I met a bloke with a two wheel drive
bike. He claimed he could climb slippery bits more easily. For that
supposed advantage he paid loads of extra cash and carried about 3lb
of extra stuff about with him.

I was very polite and said things like "interesting" "well made" and
"hasn't technology made giant strides".

Actually, those are supposed to be "not too bad"! The front wheel
drive is geared down slightly from the rear with a freewheel so the
front only engages when the rear slips.

You've still got friction losses in the transmission system, thoughbut.
It's fundamentally a flexible cable drive like some dentists drills,
and will have some degree of transmission windup, too.

Potentially more interesting is the hydraulic drive bikes various people
play with every now and again. Sooner or later someone will make one
work, and that should give you two wheel drive with continuously
variable ratios and without, I would have thought, excessive drag.

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