[RBW] Re: Cerdan Crankset

[Cyclofiend Jim]

This idea has been around a long time. If you go back into The Data Book, 
you'll see early drawings of spring-loaded cranksets. There was "BikeDrive" 
a few years ago, and there have been more throughout the decades. They have 
not caught on yet, which I don't think is a bad thing. It complicates an 
otherwise simple and direct power mechanism which works fine. 

- J



On Thursday, July 1, 2021 at 11:06:07 AM UTC-7 Doug H. wrote:

>
> https://www.designboom.com/technology/cerdan-crankset-increases-pedaling-power-06-30-2021/
> See above link:
>
> I find this design fascinating so thought I'd share it with the Group. 
> This isn't electronic shifting or carbon but good ole mechanical and metal. 
> Could this innovation become accepted in the mainstream cycling world?
> Doug
>

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[RBW] Re: Cerdan Crankset

[Doug H.]

How many inventions went through iterations until something new and 
improved was accepted by the masses though? This particular design may not 
be accepted or even particularly functional but I like the ingenuity of the 
inventor. The process of invention is more like evolution than creation in 
many cases.
Doug

On Friday, July 2, 2021 at 8:33:20 AM UTC-4 ascpgh wrote:

> Well, "the dead zone" also has more distinct margins on stiffer frames. 
> Maybe if M. Cerdan had a more supple frame he would find that its recoil 
> from deflection during his input power zone there would be less of a "dead 
> zone" if any. 
>
> Instead of inventing something without measure of an existing need, I just 
> saved and bought a frame and fork that fit me well and complimented my 
> riding. No risk, comparatively, but lacks the opportunities for preening 
> and self adulation.
>
> The video of the functioning prototype (no leads or links for buying) has 
> a rider on a large diameter aluminum MTB on road tires with an aero clip on 
> handlebar handle. If trying to focus on your improvement to cycling, 
> perhaps optimize all the other cheaper things to improve the experience. 
>
> Andy Cheatham
> Pittsburgh
>
> On Thursday, July 1, 2021 at 2:56:06 PM UTC-5 divis...@gmail.com wrote:
>
>> "*if you’re a keen cyclist 
>> , you probably know the 
>> difficulty of the so-called ‘dead zone’ when pedaling."*
>>
>> So, yet another iteration of the "I don't feel like I'm getting the same 
>> amount of power at every degree in the rotation"  fetish. Has everybody 
>> exhausted their pile of discarded Biopace etc. chainrings already?
>>
>> It's hard to make the argument that the "dead zone" is a problem, when 
>> your advertising test dummy's feet aren't actually attached to the pedals. 
>> Wouldn't slippage on the pedals account for more power variation than a 
>> theoretical "dead zone"? In my mind, it certainly calls the designer's 
>> quasi-scientific assertions into question. And does the improvement, 
>> whatever it is, outweigh the liabilities of additional weight and the extra 
>> set of single-manufacturer components to wear out?
>>
>> This reeks of a non-cyclist engineer trying to fix a non-problem for the 
>> benefit of his own ego/profit. If you're actually a "keen cyclist", you've 
>> long since adjusted your pedaling style to accommodate any sense of a "dead 
>> zone" you may happen to feel. Why wouldn't you? It's not as if every 
>> bicycle you've ever pedaled doesn't pedal the same way.
>>
>> Peter "surprised to discover how mad this seems to make me" Adler
>> pedaling normal cranks on normal bikes in normal ways, just like 
>> everybody else in
>> Berkeley, CA/USA
>>
>> On Thursday, July 1, 2021 at 11:06:07 AM UTC-7 Doug H. wrote:
>>
>>>
>>> https://www.designboom.com/technology/cerdan-crankset-increases-pedaling-power-06-30-2021/
>>> See above link:
>>>
>>> I find this design fascinating so thought I'd share it with the Group. 
>>> This isn't electronic shifting or carbon but good ole mechanical and metal. 
>>> Could this innovation become accepted in the mainstream cycling world?
>>> Doug
>>>
>>

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[RBW] Re: Cerdan Crankset

[ascpgh]

Well, "the dead zone" also has more distinct margins on stiffer frames. 
Maybe if M. Cerdan had a more supple frame he would find that its recoil 
from deflection during his input power zone there would be less of a "dead 
zone" if any. 

Instead of inventing something without measure of an existing need, I just 
saved and bought a frame and fork that fit me well and complimented my 
riding. No risk, comparatively, but lacks the opportunities for preening 
and self adulation.

The video of the functioning prototype (no leads or links for buying) has a 
rider on a large diameter aluminum MTB on road tires with an aero clip on 
handlebar handle. If trying to focus on your improvement to cycling, 
perhaps optimize all the other cheaper things to improve the experience. 

Andy Cheatham
Pittsburgh

On Thursday, July 1, 2021 at 2:56:06 PM UTC-5 divis...@gmail.com wrote:

> "*if you’re a keen cyclist , 
> you probably know the difficulty of the so-called ‘dead zone’ when 
> pedaling."*
>
> So, yet another iteration of the "I don't feel like I'm getting the same 
> amount of power at every degree in the rotation"  fetish. Has everybody 
> exhausted their pile of discarded Biopace etc. chainrings already?
>
> It's hard to make the argument that the "dead zone" is a problem, when 
> your advertising test dummy's feet aren't actually attached to the pedals. 
> Wouldn't slippage on the pedals account for more power variation than a 
> theoretical "dead zone"? In my mind, it certainly calls the designer's 
> quasi-scientific assertions into question. And does the improvement, 
> whatever it is, outweigh the liabilities of additional weight and the extra 
> set of single-manufacturer components to wear out?
>
> This reeks of a non-cyclist engineer trying to fix a non-problem for the 
> benefit of his own ego/profit. If you're actually a "keen cyclist", you've 
> long since adjusted your pedaling style to accommodate any sense of a "dead 
> zone" you may happen to feel. Why wouldn't you? It's not as if every 
> bicycle you've ever pedaled doesn't pedal the same way.
>
> Peter "surprised to discover how mad this seems to make me" Adler
> pedaling normal cranks on normal bikes in normal ways, just like everybody 
> else in
> Berkeley, CA/USA
>
> On Thursday, July 1, 2021 at 11:06:07 AM UTC-7 Doug H. wrote:
>
>>
>> https://www.designboom.com/technology/cerdan-crankset-increases-pedaling-power-06-30-2021/
>> See above link:
>>
>> I find this design fascinating so thought I'd share it with the Group. 
>> This isn't electronic shifting or carbon but good ole mechanical and metal. 
>> Could this innovation become accepted in the mainstream cycling world?
>> Doug
>>
>

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[RBW] Re: Cerdan Crankset

[Michael Morrissey]

Wow that is really interesting. I would love to try it! My 30 second search 
of the internet shows none for sale though. Thanks for posting this.

On Thursday, July 1, 2021 at 2:06:07 PM UTC-4 Doug H. wrote:

>
> https://www.designboom.com/technology/cerdan-crankset-increases-pedaling-power-06-30-2021/
> See above link:
>
> I find this design fascinating so thought I'd share it with the Group. 
> This isn't electronic shifting or carbon but good ole mechanical and metal. 
> Could this innovation become accepted in the mainstream cycling world?
> Doug
>

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[RBW] Re: Cerdan Crankset

[Garth]

I doubt it. 
It's highly proprietary, the rings(1,2,3 ?) would have to be specific to 
it. No mention of the bottom bracket. 
Proprietary = boat anchor on land.
Some cycling geeks would buy/try it, but never the mainstream. 




On Thursday, July 1, 2021 at 2:06:07 PM UTC-4 Doug H. wrote:

>
> https://www.designboom.com/technology/cerdan-crankset-increases-pedaling-power-06-30-2021/
> See above link:
>
> I find this design fascinating so thought I'd share it with the Group. 
> This isn't electronic shifting or carbon but good ole mechanical and metal. 
> Could this innovation become accepted in the mainstream cycling world?
> Doug
>

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[RBW] Re: Cerdan Crankset

[Peter Adler]

And hey: Doesn't this design pretty much demand a 1x(X) chainring setup? 
What about the hundreds of millions of cyclists who ride multi-chainring 
bikes, Monsieur Engineer Guy?

Peter "like I said" Adler
Berkeley, CA/USA

On Thursday, July 1, 2021 at 12:56:06 PM UTC-7 Peter Adler wrote:

> "*if you’re a keen cyclist , 
> you probably know the difficulty of the so-called ‘dead zone’ when 
> pedaling."*
>
> So, yet another iteration of the "I don't feel like I'm getting the same 
> amount of power at every degree in the rotation"  fetish. Has everybody 
> exhausted their pile of discarded Biopace etc. chainrings already?
>
> It's hard to make the argument that the "dead zone" is a problem, when 
> your advertising test dummy's feet aren't actually attached to the pedals. 
> Wouldn't slippage on the pedals account for more power variation than a 
> theoretical "dead zone"? In my mind, it certainly calls the designer's 
> quasi-scientific assertions into question. And does the improvement, 
> whatever it is, outweigh the liabilities of additional weight and the extra 
> set of single-manufacturer components to wear out?
>
> This reeks of a non-cyclist engineer trying to fix a non-problem for the 
> benefit of his own ego/profit. If you're actually a "keen cyclist", you've 
> long since adjusted your pedaling style to accommodate any sense of a "dead 
> zone" you may happen to feel. Why wouldn't you? It's not as if every 
> bicycle you've ever pedaled doesn't pedal the same way.
>
> Peter "surprised to discover how mad this seems to make me" Adler
> pedaling normal cranks on normal bikes in normal ways, just like everybody 
> else in
> Berkeley, CA/USA
>
> On Thursday, July 1, 2021 at 11:06:07 AM UTC-7 Doug H. wrote:
>
>>
>> https://www.designboom.com/technology/cerdan-crankset-increases-pedaling-power-06-30-2021/
>> See above link:
>>
>> I find this design fascinating so thought I'd share it with the Group. 
>> This isn't electronic shifting or carbon but good ole mechanical and metal. 
>> Could this innovation become accepted in the mainstream cycling world?
>> Doug
>>
>

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[RBW] Re: Cerdan Crankset

[Peter Adler]

"*if you’re a keen cyclist , 
you probably know the difficulty of the so-called ‘dead zone’ when 
pedaling."*

So, yet another iteration of the "I don't feel like I'm getting the same 
amount of power at every degree in the rotation"  fetish. Has everybody 
exhausted their pile of discarded Biopace etc. chainrings already?

It's hard to make the argument that the "dead zone" is a problem, when your 
advertising test dummy's feet aren't actually attached to the pedals. 
Wouldn't slippage on the pedals account for more power variation than a 
theoretical "dead zone"? In my mind, it certainly calls the designer's 
quasi-scientific assertions into question. And does the improvement, 
whatever it is, outweigh the liabilities of additional weight and the extra 
set of single-manufacturer components to wear out?

This reeks of a non-cyclist engineer trying to fix a non-problem for the 
benefit of his own ego/profit. If you're actually a "keen cyclist", you've 
long since adjusted your pedaling style to accommodate any sense of a "dead 
zone" you may happen to feel. Why wouldn't you? It's not as if every 
bicycle you've ever pedaled doesn't pedal the same way.

Peter "surprised to discover how mad this seems to make me" Adler
pedaling normal cranks on normal bikes in normal ways, just like everybody 
else in
Berkeley, CA/USA

On Thursday, July 1, 2021 at 11:06:07 AM UTC-7 Doug H. wrote:

>
> https://www.designboom.com/technology/cerdan-crankset-increases-pedaling-power-06-30-2021/
> See above link:
>
> I find this design fascinating so thought I'd share it with the Group. 
> This isn't electronic shifting or carbon but good ole mechanical and metal. 
> Could this innovation become accepted in the mainstream cycling world?
> Doug
>

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