Does climbing differ from flat riding?
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Originally Posted by Ben Cousins
Ok - your model is too simple. So simple, in fact, that it's not worth taking seriously. If the conclusion of the model is that a good climber is also a good flat cyclist, then 1000's of results from amateur and professional races every year prove your proposition wrong. Watch the TDF this year - check out the flat sprinting experts (high speed on the flat) falling to pieces in the mountains.
Yes. You could read up on it if you spend some time around cyclists or do some book research on the topic. I take it you didn't learn your physics by posting 'what is physics' on a message board?
Yes. You could read up on it if you spend some time around cyclists or do some book research on the topic. I take it you didn't learn your physics by posting 'what is physics' on a message board?
Subjectively, to me, climbing IS different, and thinking about it, it could be due to the fact that while climbing, there is a constant force on the pedals that you are battling against; slack off for a moment and your speed bleeds away. It requires sustained effort which in flat riding you can take a moment of rest without the speed bleeding off too much.
So here is something I didn't think of before:
Is climbing different due to the resisting force coming through the pedals? Eg, if you're riding a fixie slowly up a hill, if you don't keep on going every second, your going to roll to a stop and then backwards - there is a reversing force from the pedals. While riding flats, there is resistance but it is not driving backwards, it is merely slowing down.
Is that it?
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Originally Posted by Ben Cousins
I take it you didn't learn your physics by posting 'what is physics' on a message board?
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I am an engineer by trade.
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The question "Are you good at climbing?"
Answer: "I'm as good at climbing as I am in the flats minus the gravitational pull."
Answer: "I'm as good at climbing as I am in the flats minus the gravitational pull."
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Originally Posted by jur
Is climbing different due to the resisting force coming through the pedals? Eg, if you're riding a fixie slowly up a hill, if you don't keep on going every second, your going to roll to a stop and then backwards - there is a reversing force from the pedals. While riding flats, there is resistance but it is not driving backwards, it is merely slowing down.
Is that it?
Is that it?
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I think that you have to include physiology as well as physics in your model. People have different riding techniques, lung capacity, pain thresholds, etc. that influence how and why they ride better on flats versus hills. Physics may explain why a particular rider may do better on one than the other but I'm an accountant so what do I know?
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Have you noticed that when you spend less time doing maths and more time riding uphill your speed going uphill gets better? ....hmmm, I wonder why that is?
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Originally Posted by terrymorse
How do you measure up? Calculate what sort of climbing rate you can attain on a 6% grade with about an 80% heart rate. The seen where you fall on this chart(*):
Age ---- Climbing Rate (ft/hr)
30 -------- 4250
40 -------- 4000
50 -------- 3700
60 -------- 3400
70 -------- 3000
80 -------- 2700
So what's your climbing age? Mine is about 60 right now, but I'm hoping to get down to 50 as the season progresses. FYI, these are the climbing rates you need if you want to do well at the Masters Nationals (for the respective age groups).
When did I learn that I was a decent climber? When I rode the CA/NV State Climbing Championships (Everest Challenge ) for fun last September and won the 40+ public category.
* Source: Baker, A., High-Intensity Training for Cyclists, 8th Edition
Age ---- Climbing Rate (ft/hr)
30 -------- 4250
40 -------- 4000
50 -------- 3700
60 -------- 3400
70 -------- 3000
80 -------- 2700
So what's your climbing age? Mine is about 60 right now, but I'm hoping to get down to 50 as the season progresses. FYI, these are the climbing rates you need if you want to do well at the Masters Nationals (for the respective age groups).
When did I learn that I was a decent climber? When I rode the CA/NV State Climbing Championships (Everest Challenge ) for fun last September and won the 40+ public category.
* Source: Baker, A., High-Intensity Training for Cyclists, 8th Edition
P (power output) = m * g * v, where m is combined body and bike mass, g is gravitational acceleration, v is vertical climbing rate.
So using your known climbing rate, and performing this calculation, you can calculate your maximum sustained power output.
Now you can use this same value for power output, divide by wind resistance, and calculate your maximum sustained flat speed:
S (max speed) = P / R, where R is wind resistance.
I'm saying your body does not know the difference between these two. If you were blindfolded, you would not be able to detect if you are climbing at a constant speed or riding flat at a constant speed.
If you disagree, where am I going wrong in the argument?
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Originally Posted by jur
Since every rate of climbing equates to a certain power output, and since every flat constant speed also equates to a certain power output, it follows that climbing at a certain rate is the same as riding flat at a certain speed, ifthose two have the same power.
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Originally Posted by jeff800
The question "Are you good at climbing?"
Answer: "I'm as good at climbing as I am in the flats minus the gravitational pull."
Answer: "I'm as good at climbing as I am in the flats minus the gravitational pull."
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Originally Posted by jur
This equation explains why ANY climbing requires effort, regardless of how fast you climb. It also explains why slow flat riding requires no effort - no energy is gained.
Originally Posted by jur
Your fitness will dictate exactly how fast you can climb...And the amount of power (in watts) your body can put out at a sustained level is determined by your fitness.
Originally Posted by jur
So, vertical climbing rate is directly determined by your fitness.
Originally Posted by jur
...if someone answers, no they suck at climbing but are OK on the flats, that is contradictory.
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Originally Posted by TexasGuy
I aint as good as i used to be, but I'm as good as I once was. ![Stick Out Tongue](images/smilies/tongue.gif)
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Originally Posted by Steelrider
But fitness being equal, it is the power-to-weight ratio of the climbers that will determine how fast/far each will be able to climb.
You seem to be saying that two riders with identical power outputs can climb at the same rate, which would not be true at all because it ignores the weights that identical power outputs have to haul up the hill...
You seem to be saying that two riders with identical power outputs can climb at the same rate, which would not be true at all because it ignores the weights that identical power outputs have to haul up the hill...
Last night watching the TdF, Phil Liggett mentioned that Lance is not concerened about Tom Boonen because he can't climb... is this because Tom is a big guy?
All the refs to climbing and sprinting, does it all boil down to power to mass ratio, or are there additional factors?
I am genuinely puzzled as to what exactly makes one a good climber, besides fitness, and besides power to mass ratio. If someone had a good ratio, and was fit enough, would they necessarily be a good climber?
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Originally Posted by jur
I'm saying your body does not know the difference between these two. If you were blindfolded, you would not be able to detect if you are climbing at a constant speed or riding flat at a constant speed.
If you disagree, where am I going wrong in the argument?
If you disagree, where am I going wrong in the argument?
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When I try to ride flat course as fast as I can, I have to pay attention to a few other things besides peddaling hard. Keeping my position aero, pulling my legs high close to my upper body and still breath easily. Often it's hard to decide where the compromise is and find myself keep changing the position.
On the other hand, climbing. I just pound it as hard as I can, much easier.
On the other hand, climbing. I just pound it as hard as I can, much easier.
#65
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I know little about physics, but this seems really simple to me.
ON FLAT, you expend a certain amount of energy to defeat wind resistence and friction to move forward
ON INCLINE you expend a certain amount of energy to defeat wind resistence, friction and gravity to move forward and farther from the center of the earth's core.
So with an equal amount of energy spent you will move less distance on an incline.
About climbers
This is probably 75% of what makes a good climber good. The other 25% is probably a mix of other vital statistics, (VO2max, LT, pain threshold)
NOW heres a question I would love to get answered, why do us fat people blast down hills way faster then skinny people!!!
ON FLAT, you expend a certain amount of energy to defeat wind resistence and friction to move forward
ON INCLINE you expend a certain amount of energy to defeat wind resistence, friction and gravity to move forward and farther from the center of the earth's core.
So with an equal amount of energy spent you will move less distance on an incline.
About climbers
If someone had a good ratio, and was fit enough, would they necessarily be a good climber?
NOW heres a question I would love to get answered, why do us fat people blast down hills way faster then skinny people!!!
Last edited by gattm99; 07-06-05 at 11:45 PM.
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Well, here is my two cents. There is a climbing rate that is equivalent (in energy used) to a flat rate for each given gradient and wieght of a rider. The relationship of the speed of climbing versus flat is different for a heavy rider. The OP is not necessarily clear on this but this part is fine.
What thangs are "different" and does looking at the net energy applied capture the entire story. I use "net" here because there is a difference between the work performed (net) and the energy used (gross) because of inefficiencies in the engine and its mechanics (rider and the bike).
The climbing angles are different than on the flat, so that your position on the bike affects how effectively you perform your work. There are several useful situations to ponder. First, recumbant bikes suck on climbs. You push UP on the pedals while trying and cannot bring your body mass into play in the manner that humans evolved to do and hence you are not efficient in that position. Second, you have to have the right gearing or you end of under-geared on steeper climbs and cannot climb as efficiently; as slopes get really steep there are practical problems like not falling over. Third, it is virtually universely observed that the riders cadence is slower on a climb than on the flats. This hold whether the rider is a fast turnover rider or a slow one; the cadence for each falls even though the rates are different for each (compare Armstrong and Ullrich).
Third, mentally they are not the same. Riding much slower than you are used to has a psychological effect on riders, and many riders cannot climb well. (Riding into a strong wind is similar, although the dynamics are different as regards weight and body position can effect the necessary work in the wind and not on a clilmb in the same manner.) Riders are used to pulsing efforts in a group and doing what is necessary to stay in the group because the alternative is less desired. On a climb, as soon as you back off you slow down -- no coasting, no drafting along (well, especially for the pros, even a 6% slope is ridden fast enough that there is a drafting advantage).
Ok, flame away, I wrote this too late at night.
What thangs are "different" and does looking at the net energy applied capture the entire story. I use "net" here because there is a difference between the work performed (net) and the energy used (gross) because of inefficiencies in the engine and its mechanics (rider and the bike).
The climbing angles are different than on the flat, so that your position on the bike affects how effectively you perform your work. There are several useful situations to ponder. First, recumbant bikes suck on climbs. You push UP on the pedals while trying and cannot bring your body mass into play in the manner that humans evolved to do and hence you are not efficient in that position. Second, you have to have the right gearing or you end of under-geared on steeper climbs and cannot climb as efficiently; as slopes get really steep there are practical problems like not falling over. Third, it is virtually universely observed that the riders cadence is slower on a climb than on the flats. This hold whether the rider is a fast turnover rider or a slow one; the cadence for each falls even though the rates are different for each (compare Armstrong and Ullrich).
Third, mentally they are not the same. Riding much slower than you are used to has a psychological effect on riders, and many riders cannot climb well. (Riding into a strong wind is similar, although the dynamics are different as regards weight and body position can effect the necessary work in the wind and not on a clilmb in the same manner.) Riders are used to pulsing efforts in a group and doing what is necessary to stay in the group because the alternative is less desired. On a climb, as soon as you back off you slow down -- no coasting, no drafting along (well, especially for the pros, even a 6% slope is ridden fast enough that there is a drafting advantage).
Ok, flame away, I wrote this too late at night.
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Originally Posted by gattm99
I know little about physics, but this seems really simple to me.
ON FLAT, you expend a certain amount of energy to defeat wind resistence and friction to move forward
ON INCLINE you expend a certain amount of energy to defeat wind resistence, friction and gravity to move forward and farther from the center of the earth's core.
So with an equal amount of energy spent you will move less distance on an incline.
About climbers
This is probably 75% of what makes a good climber good. The other 25% is probably a mix of other vital statistics, (VO2max, LT, pain threshold)
NOW heres a question I would love to get answered, why do us fat people blast down hills way faster then skinny people!!!
ON FLAT, you expend a certain amount of energy to defeat wind resistence and friction to move forward
ON INCLINE you expend a certain amount of energy to defeat wind resistence, friction and gravity to move forward and farther from the center of the earth's core.
So with an equal amount of energy spent you will move less distance on an incline.
About climbers
This is probably 75% of what makes a good climber good. The other 25% is probably a mix of other vital statistics, (VO2max, LT, pain threshold)
NOW heres a question I would love to get answered, why do us fat people blast down hills way faster then skinny people!!!
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Originally Posted by jur
I have not made it clear what my puzzlement is... I fully agree with all of your points.
Last night watching the TdF, Phil Liggett mentioned that Lance is not concerened about Tom Boonen because he can't climb... is this because Tom is a big guy?
All the refs to climbing and sprinting, does it all boil down to power to mass ratio, or are there additional factors?
I am genuinely puzzled as to what exactly makes one a good climber, besides fitness, and besides power to mass ratio. If someone had a good ratio, and was fit enough, would they necessarily be a good climber?
Last night watching the TdF, Phil Liggett mentioned that Lance is not concerened about Tom Boonen because he can't climb... is this because Tom is a big guy?
All the refs to climbing and sprinting, does it all boil down to power to mass ratio, or are there additional factors?
I am genuinely puzzled as to what exactly makes one a good climber, besides fitness, and besides power to mass ratio. If someone had a good ratio, and was fit enough, would they necessarily be a good climber?
The first two have already been articulated ( and I’ll expand further on one):
1) by skinny , differing muscle groups due the lean of the change in pitch of the bike.
2) by Steve, aero vs. wt., aero drag for a larger rider relative a smaller rider goes up minutely. Assume a 160 lb rider vs. a 192 lb rider both identically proportioned. The 192 lb rider has (192/160) ^ (2/3) more frontal area than the 160 lb rider with an identical drag coefficient. Therefore, 12.9 % more rider induced aero drag than the 160 lber. Also, the larger rider’s bike has only slightly more aero drag than the lighter rider, so the larger rider’s aero drag is has increased sublinearly. But the mass needed to be raised in a climb has increased linearly.
3) strength goes up with size of the rider, but not linearly, sub linearly. A 192 lb rider is generally stronger than the 160 lb rider, but the 192 lb rider is not usually capable of putting out 20% more power. It takes the 192 lb rider 20 % more power to climb at the same rate as the 160 lb rider, but he usually doesn’t have that much more strength.
Regarding the incline controled pitch lean, yes it would be possible to design a climb specific bike to place the rider at an optimal climb power position for a specific incline, but then you’ve sacrificed the best position for the flats. You rarely have a course or route that is a pure constant incline climb.
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Thanks very much for all the replies. At the end of the day, although I understood all the principles explained in the posts before, I did not necessarily connect them to this question, so I certainly have a better understanding now.
I'm off now to lose another few pounds, and fitness training, and shedding every bit of excess mass on the bike, so I can leave my buddy behind on our monthly Mt Dandenong race.
He's racing a brand new Cannondale flat bar racer, I'm racing an ancient Giant hybrid which is delightfully light
I'm off now to lose another few pounds, and fitness training, and shedding every bit of excess mass on the bike, so I can leave my buddy behind on our monthly Mt Dandenong race.
He's racing a brand new Cannondale flat bar racer, I'm racing an ancient Giant hybrid which is delightfully light
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Originally Posted by jur
Does climbing differ from flat riding? Before you jump to conclusions and say "of course it does", read on...
So here is the final part of the argument:
Since every rate of climbing equates to a certain power output, and since every flat constant speed also equates to a certain power output, it follows that climbing at a certain rate is the same as riding flat at a certain speed, ifthose two have the same power.
Soooo, how is climbing different from flat riding??? Is the question "Are you a good climber" meaningful at all? If someone answers, no they suck at climbing but are OK on the flats, that is contradictory.
So here is the final part of the argument:
Since every rate of climbing equates to a certain power output, and since every flat constant speed also equates to a certain power output, it follows that climbing at a certain rate is the same as riding flat at a certain speed, ifthose two have the same power.
Soooo, how is climbing different from flat riding??? Is the question "Are you a good climber" meaningful at all? If someone answers, no they suck at climbing but are OK on the flats, that is contradictory.
Since every rate of bike riding equates to a certian power output, and since every rate of swimming equates to a certian power output how is bike riding different from swimming?
The only real difference here is that in climbing vrs flats the activity is similar enough that the question does not look absurd. Many of the posts have done a very good job of showing that while flats and hills look the same they are in fact different. I just provide the reduction to absurdity.
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Hmmm... like many of the posters in this thread, you have missed the actual point. The point you make is childishly simple and was never questioned in the first place.
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Originally Posted by jur
Does climbing differ from flat riding? Before you jump to conclusions and say "of course it does", read on...
1) Climbing involves raising your mass from one level to another. The amount of potential energy you gain by climbing is E = mgh, where m is mass in kg, g is gravitational constant in m/s/s, and h is vertical height in m.
This equation explains why ANY climbing requires effort, regardless of how fast you climb. It also explains why slow flat riding requires no effort - no energy is gained.
2) Your fitness will dictate exactly how fast you can climb. Ignoring wind resistance (just for now), the grade of the road together with your forward speed determines the rate of climbing, or the rate at which you gain potential energy. A constant rate of gaining energy equates to a certain power output by your body. And the amount of power (in watts) your body can put out at a sustained level is determined by your fitness.
So, vertical climbing rate is directly determined by your fitness.
Now on to flat riding.
3) Flat riding (by flat I mean zero gradient) involves no gain of energy, so from that point of view, no effort. However, there is wind resistance (and rolling resistance and so on), which requires effort to overcome.
4) Wind resistance is a function of your speed. This means, that for every constant speed, there is a certain power output required to maintain that speed. The higher the speed, the higher power (in watts) is required to maintain that speed.
So here is the final part of the argument:
Since every rate of climbing equates to a certain power output, and since every flat constant speed also equates to a certain power output, it follows that climbing at a certain rate is the same as riding flat at a certain speed, ifthose two have the same power.
Soooo, how is climbing different from flat riding??? Is the question "Are you a good climber" meaningful at all? If someone answers, no they suck at climbing but are OK on the flats, that is contradictory.
1) Climbing involves raising your mass from one level to another. The amount of potential energy you gain by climbing is E = mgh, where m is mass in kg, g is gravitational constant in m/s/s, and h is vertical height in m.
This equation explains why ANY climbing requires effort, regardless of how fast you climb. It also explains why slow flat riding requires no effort - no energy is gained.
2) Your fitness will dictate exactly how fast you can climb. Ignoring wind resistance (just for now), the grade of the road together with your forward speed determines the rate of climbing, or the rate at which you gain potential energy. A constant rate of gaining energy equates to a certain power output by your body. And the amount of power (in watts) your body can put out at a sustained level is determined by your fitness.
So, vertical climbing rate is directly determined by your fitness.
Now on to flat riding.
3) Flat riding (by flat I mean zero gradient) involves no gain of energy, so from that point of view, no effort. However, there is wind resistance (and rolling resistance and so on), which requires effort to overcome.
4) Wind resistance is a function of your speed. This means, that for every constant speed, there is a certain power output required to maintain that speed. The higher the speed, the higher power (in watts) is required to maintain that speed.
So here is the final part of the argument:
Since every rate of climbing equates to a certain power output, and since every flat constant speed also equates to a certain power output, it follows that climbing at a certain rate is the same as riding flat at a certain speed, ifthose two have the same power.
Soooo, how is climbing different from flat riding??? Is the question "Are you a good climber" meaningful at all? If someone answers, no they suck at climbing but are OK on the flats, that is contradictory.
here is an idea, hop on your bike and ride a flat course, and then a steep climb, and when you are done come back to us and tell us what did you find out..
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Originally Posted by sorebutt
here is an idea, hop on your bike and ride a flat course, and then a steep climb, and when you are done come back to us and tell us what did you find out..
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Originally Posted by skinnyone
I like chanmans explanation better but anyway.. you move in your saddle to keep you upright, as the bike is on an incline.. Even if you are conditioned, you are talking about a bunch of musles, not one single muscle. Power is derived from different muscle groups in different positions..
wait i didnt even post in this thread? ohh i get it, you know im going to clear things up so you just agree with my post before i even post it.
well i dont really want to use my brain right now and do a bunch of math, but common sense tells me that the increased resistence due to gravity when climbing is much greater then the decrese in wind resistence due to slowing down. therefor climbing is harder.
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