speed on rollers versus speed outside on flats, no wind
12-18-09, 07:19 PM
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
12-18-09, 07:23 PM
#27
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He responded with much excitement "yeah you could put a cinderblock under the front! It would work!"
12-18-09, 07:35 PM
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I haven't tried it but I'm having a hard time believing that it would make any difference, other than muscle recruitment.
12-18-09, 07:38 PM
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I'll bet that after more than a couple of degrees you would just fall off the back of the rollers.
Last edited by ibis_ti; 12-18-09 at 07:42 PM.
12-18-09, 07:39 PM
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On one hand, you're not actually going anywhere, so there's no power used to move weight up the hill.
On the other hand, if you just sat on the rollers, I think you'd roll off the back if they were inclined. Which seems to point to having to do extra work against that.
I dunno.
12-18-09, 07:43 PM
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is there a physics teacher in the house?
oh wait... why couldn't someone have asked this earlier, my current math teacher is a former physicist
oh wait... why couldn't someone have asked this earlier, my current math teacher is a former physicist
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
12-18-09, 07:47 PM
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On second consideration, I'm gonna say it wouldn't change the power since you're not actually having to go up the hill, you're staying in the same place. Your only resistance is coming from rolling resistance, which doesn't change with incline.
There would be a minimum speed below which you'd fall off the back, but I don't think that's going to change the power so long as you're above that speed.
There would be a minimum speed below which you'd fall off the back, but I don't think that's going to change the power so long as you're above that speed.
12-18-09, 07:54 PM
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I think you'd fall off the back no matter what. If there is a minimum speed, how would you even get started? Remember your speed(velocity) on the rollers is 0. Only your tire is spinning, you aren't actually traveling forward.
12-18-09, 07:54 PM
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If you're working against gravity to stay on, then yes, it will be harder. The difference is that you'll have to spin even faster to have the resistance of the rollers be enough to support the bike + rider's weight against the force of gravity. If the rollers support the rear wheel enough to where you won't fall off the back at 0 mph, then it'll only be harder in the different muscle groups.
Theoretically, at a 10% grade you'll have to work against 10% of gravity. Lets assume the bike + rider is 180 lbs. That's 18 lbs of force you'll have to create by pedaling fast enough.
Theoretically, at a 10% grade you'll have to work against 10% of gravity. Lets assume the bike + rider is 180 lbs. That's 18 lbs of force you'll have to create by pedaling fast enough.
12-18-09, 07:57 PM
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Kreitlers 4.5 inch rollers with a killer headwind resistance for me. I've been doing workouts in a 38Tx18T which is good for 250watts at 95-100 RPM, with a great breeze.
12-19-09, 06:05 AM
#37
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I know I can easily get my heart rate up around max no problem with the resistance unit on my rollers set to about 1/2 at only 20-21 mph indicated. This doesn't happen on a flat windless road so I just ignore indicated speed and go with heart rate.
12-19-09, 06:09 AM
#38
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I'm betting inclining the rollers would increase the chances of them breaking and then someone can start a 40 page thread on how {insert roller mfgs} should warranty them. If you need more get one with a resistance unit. The emotions will give more resistance than you can utilize.
