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Old 06-18-14, 09:53 AM   #1
gsteinb
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A better argument for today - how much weight matters

One bike weights 1/4 pound more than the other. How much of a difference does it make over an hour going up hill?
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Old 06-18-14, 10:14 AM   #2
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How steep is the hill ?

http://kreuzotter.de/english/espeed.htm

At 300 watts, save 1 minute over 10 miles at 10% (according to them.... sounds like too much)

Calculator seems to not work correctly. I change variables, but the result sometimes stays the same.
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Old 06-18-14, 10:16 AM   #3
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8.5%
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Old 06-18-14, 11:02 AM   #4
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What's the total elevation gain on the hill in question?

You're looking at 0.1134kg.
Force required to lift it F=ma, so F = 0.1134kg * 9.8m/s^2 = 1.111N
Work = F * d = 1.111N * elevation gain in meters. For a 3000ft climb, it's 914m, so 1.111N * 914m = 1016Nm = 1016J of work
If you spend an hour climbing this hill, you've 1016J / 60*60s = 0.28J/s = 0.28W​ to get this 1/4 lb. up the hill at that pace.

So just substitute your elevation in meters and the Strava KOM time for duration and recalculate.
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Old 06-18-14, 11:10 AM   #5
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Quote:
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One bike weights 1/4 pound more than the other. How much of a difference does it make over an hour going up hill?
41 seconds?
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Old 06-18-14, 11:24 AM   #6
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33 seconds of you're racing
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Old 06-18-14, 12:22 PM   #7
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One bike weights 1/4 pound more than the other. How much of a difference does it make over an hour going up hill?
too much thinking involved
ride up on the favorite bike and let the chips fall
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Old 06-18-14, 12:24 PM   #8
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I'm not thinking. Just looking to start a weight weenies argument.

the bikes are same, but for 1/4 pound difference in the groups.
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Old 06-18-14, 12:41 PM   #9
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Just looking to start a weight weenies argument.
My method of calculation is best. Argument settled. You gonna lock it now?
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Old 06-18-14, 12:42 PM   #10
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winners win on anything; how's that?
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Old 06-18-14, 12:43 PM   #11
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well my question would be what would the advantage of using the heavier bike be If you can go lighter I say go lighter. My thought process has always been go as light as possible until it starts becoming less aero or less stable to handle. That or the $$ just is not worth the marginal gain .


I do know that if I was 10 pounds lighter in one of my April road races that I wouldn't have been dropped.
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Old 06-18-14, 12:59 PM   #12
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I'm not thinking. Just looking to start a weight weenies argument.
the bikes are same, but for 1/4 pound difference in the groups.
Reported
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Old 06-18-14, 01:13 PM   #13
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**** you, you ****ing ****
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Old 06-18-14, 01:15 PM   #14
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What's the total elevation gain on the hill in question?
3500 feet give or take 100
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Old 06-18-14, 01:16 PM   #15
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3500 feet give or take 100
expected elapsed time?
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Old 06-18-14, 01:26 PM   #16
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Strava Segment | Whiteface Hillclimb

According to Bike Calculator 0.25 lbs is worth 3.6 minutes [edit: seconds], making some other reasonable assumptions.

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Old 06-18-14, 01:28 PM   #17
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expected elapsed time?
something south of 52 the good lord willing.
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Old 06-18-14, 01:31 PM   #18
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Strava Segment | Whiteface Hillclimb

According to Bike Calculator 0.25 lbs is worth 3.6 minutes, making some other reasonable assumptions.

gees that can't be true can it? jinkies, just losing all the extra clothes I normally haul to the top, along with the repair stuff, and using race wheels dear god I'm losing pounds. I'm going to rip a hole in the god damn space time continuum.
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Old 06-18-14, 01:32 PM   #19
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How much does a McDonalds quarter-pounder weigh?
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Old 06-18-14, 01:33 PM   #20
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Old 06-18-14, 01:35 PM   #21
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Sorry... heh... 3.6 seconds

155 lb rider/clothes/shoes + 17 lb bike @ 300w => 51:06. 17.25 lb bike => 51:10.
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Old 06-18-14, 01:36 PM   #22
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well that's ****ing deflating
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Old 06-18-14, 01:49 PM   #23
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Yeah, I'm seeing a difference of 0.38W to maintain speed with the extra 1/4 lb, assuming you'll be in a break with somebody, and in the pack before that, your time will actually be the same. Throughout most of the race, you'll be costing yourself a whole 1/3 of a Watt.

I say I still win, because power needed to keep up is the important figure, unless this is a time trial.

It's still ****ing deflating though.
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Old 06-18-14, 01:54 PM   #24
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mass start hill climb. it shatters though and everyone rides alone.

for 3 seconds I'll just ride the bike I keep up there so I don't have to bring extra stuff back and forth
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Old 06-18-14, 01:54 PM   #25
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But wait...what if that 1/4 pound is in the wheels because, you know ... rotational weight. 3.6 seconds could become 3.611 seconds.
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