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Frame design influenced by riding positon?
Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position?
Cheers |
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#2
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Frame design influenced by riding positon?
are you practiced at pedaling while standing forward supported by bar ?
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#3
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Frame design influenced by riding positon?
On 3/30/2014 8:14 AM, Sir Ridesalot wrote:
Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position? How do you mean, exactly? Obviously (for an extreme case) a recumbent's frame design is very heavily influenced by the riding position. Rivendell's bikes tout their longer, taller head tubes, as a way of giving the rider a slightly more upright position, for comfort. Classic three speed roadster bikes have slacker head & seat tube angles to facilitate a very upright riding position. What did you have in mind? -- - Frank Krygowski |
#4
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Frame design influenced by riding positon?
On Sun, 30 Mar 2014 05:14:03 -0700 (PDT), Sir Ridesalot
wrote: Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position? Yes, depending on the riding speed. Wind resistance is proportional to wind speed cubed. If the bicycle is not intended to be ridden at high speeds, wind resistance, and therefore rider drag, are not an important consideration. That comes into play with comfort and commuter bicycles, which are not intended for racing. An aero frame and aero components would be useless on such a bicycle. It wouldn't matter much anyway because the least aerodynamic component on a bicycle is the upright rider. Are you perhaps talking about the load distribution? In the upright riding position, almost all the riders weight is supported by the saddle and pedals. In the bent over position, about 75% of the weight is on the saddle and pedals, while about 25% is on the handlebars. If one were designing for the bleeding edge of frame lightness (i.e. carbon fiber) this would be a consideration. However, most bicycles need to safely accommodate both riding positions, so for versatile frame designs, it's probably not a major consideration. I think it might help of you describe what you're trying to accomplish. If you're thinking of trading the improved rider efficiency offered by an upright riding position, for an increase in wind resistance, then that won't work for racing, but is quite effective for low speed bicycle travel. Besides being more efficient, upright is also more comfortable. Note the predominance of upright handlebars and riders: https://www.youtube.com/watch?v=n-AbPav5E5M (I did see one bicycle with drop bars near the beginning). -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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Frame design influenced by riding positon?
JL - fat people/outofshape ride upright why ? good question....they cannuh bend over ?
vortex. riding upright strains the abdomen/midsection maybe a small amount of EX at lower speeds. extreme positions give forward power frames a bad name. Easy positioning lower body for forward power while keeping head up, innards uncrushed avoiding a TdF extreme. I doahno compact frames but ones I see on street are all straight up posture frames.... hard tellin until you ride one or more. Frame's position TRANSFERING into the off seat on bar power position could be there ? |
#6
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Frame design influenced by riding positon?
On Sunday, March 30, 2014 8:14:03 AM UTC-4, Sir Ridesalot wrote:
Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position? Cheers Addendum. I was interested in bicycle design and the technical aspects of it when designing for drop bars, or upright riding positions. Things such as slacker angkles mentioned by anothr poster or if frames are longer etcetera. Cheers |
#7
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Frame design influenced by riding positon?
On Sunday, March 30, 2014 2:44:52 PM UTC-4, Sir Ridesalot wrote:
On Sunday, March 30, 2014 8:14:03 AM UTC-4, Sir Ridesalot wrote: Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position? Cheers Addendum. I was interested in bicycle design and the technical aspects of it when designing for drop bars, or upright riding positions. Things such as slacker angkles mentioned by anothr poster or if frames are longer etcetera. Cheers rrrrrrrrrrrrrrrr good question....riding upright where place hands for linking abdomen to thighs n glutes ? APE HANGERS ! |
#8
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Frame design influenced by riding positon?
On Sun, 30 Mar 2014 05:14:03 -0700 (PDT), Sir Ridesalot
wrote: Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position? Cheers Certainly "Triathlete" bikes and speed record bikes are different. See http://en.wikipedia.org/wiki/Graeme_Obree for example. The "tri" bikes have a more upright seat post to move the rider forward so he fits the extended "tri-bars" better, and probably the long distance people like the RAAM riders that do really long rides and use the extended bars use something similar, as well as time trials bikes. Seat post and head tube angle is also usually different on track bikes and stage racing bikes as well as road bikes and when you think about it even "beach cruisers" have different geometry from a conventional "road bike". So, yes frame design does vary, in some degree, depending on the intended bike use. -- Cheers, John B. |
#9
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Frame design influenced by riding positon?
On Sunday, March 30, 2014 9:47:01 PM UTC-4, John B. wrote:
On Sun, 30 Mar 2014 05:14:03 -0700 (PDT), Sir Ridesalot wrote: Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position? Cheers Certainly "Triathlete" bikes and speed record bikes are different. See http://en.wikipedia.org/wiki/Graeme_Obree for example. The "tri" bikes have a more upright seat post to move the rider forward so he fits the extended "tri-bars" better, and probably the long distance people like the RAAM riders that do really long rides and use the extended bars use something similar, as well as time trials bikes. Seat post and head tube angle is also usually different on track bikes and stage racing bikes as well as road bikes and when you think about it even "beach cruisers" have different geometry from a conventional "road bike". So, yes frame design does vary, in some degree, depending on the intended bike use. -- Cheers, John B. I've read that triathalon bicycles are designed to make the transition from riding to running easier but they sacrifice comfort on really long rides to do so. Cheers |
#10
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Frame design influenced by riding positon?
On Sun, 30 Mar 2014 19:42:01 -0700 (PDT), Sir Ridesalot
wrote: On Sunday, March 30, 2014 9:47:01 PM UTC-4, John B. wrote: On Sun, 30 Mar 2014 05:14:03 -0700 (PDT), Sir Ridesalot wrote: Read somewhere recently that riding upright is more efficient than riding bent over but riding bent over is better in the wind or at speeds where perceived wind is a factor due to the force exerted upon a less aerodynamic upright riding position. That got me to wondering. Are bicycle frame designs influenced much by the intended riding position? Cheers Certainly "Triathlete" bikes and speed record bikes are different. See http://en.wikipedia.org/wiki/Graeme_Obree for example. The "tri" bikes have a more upright seat post to move the rider forward so he fits the extended "tri-bars" better, and probably the long distance people like the RAAM riders that do really long rides and use the extended bars use something similar, as well as time trials bikes. Seat post and head tube angle is also usually different on track bikes and stage racing bikes as well as road bikes and when you think about it even "beach cruisers" have different geometry from a conventional "road bike". So, yes frame design does vary, in some degree, depending on the intended bike use. -- Cheers, John B. I've read that triathalon bicycles are designed to make the transition from riding to running easier but they sacrifice comfort on really long rides to do so. Cheers I'm not a triathlete by any means but I did run for many years and I can't see any way to make transition from cycling to running easier, other than perhaps using slip on shoe's, or something like that. But I have read quite a bit about tri bikes though and the people who ride them seem to think that the secret is the position with the elbows at the stem and the hands forward. They don't talk much about comfort but a lot about low wind resistance. http://www.active.com/triathlon/arti...-specific-bike http://www.onlinetriathlontraining.c...riathlon-bike/ -- Cheers, John B. |
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