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Bicycle weight doesn't matter? (myth)

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Bicycle weight doesn't matter? (myth)

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Old 07-12-18, 02:12 PM
  #51  
Milton Keynes
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Originally Posted by woodcraft View Post
Didn't the drillium trend also fade because all those holes

created an aero penalty more than a weight advantage?
I don't know, but that's extremely logical. A bunch of open holes means more drag.
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Old 07-12-18, 02:16 PM
  #52  
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Originally Posted by Metieval View Post
the forum has a search feature top right corner. If you wish to see/read/hear what
people use to quantify their "weight doesn't matter arguments"
That is because in the frame of reference in which most of these conversations take place, weight does not matter.

Yes, from a purely physics perspective, weight matters. No, a bike that is a pound lighter isn't going to make most people here, and the style of riding they do, any faster. Context to a statement does matter.

Perhaps the simplest question, though, are you on the lightest bike available: https://www.cyclingweekly.com/news/p...i-mons-352208? If not, then weight must not matter
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Old 07-12-18, 02:18 PM
  #53  
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Originally Posted by indyfabz View Post
You can overcome a bike weight disadvantage by inflating the tires with helium.

I tried that, but because the tires are not that big, it didn't have enough of an effect. I then emptied on of my panniers and put a large helium balloon in it. That had an effect, but unfortunately a bad one. My bike was completely out of balance and I had a bad wreck. A month later, after recovering from my injuries, I tried again. This time I wanted to attach a ballon to my rear rack, centered this time, but learning from my earlier mistake, I also added on to the front rack. Success! The bike feels much lighter, but I have to be careful when parking the bike, if I don't have a load in the panniers. If the bike is not sufficiently tied down, it will float away. (Don't ask how I know, just suffice to say it pays to carry a BB gun.)
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Old 07-12-18, 02:20 PM
  #54  
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Originally Posted by Kontact View Post
If you put it in your pocket, then it won't count as bike weight and there is no problem.

Plus you can drill holes in the sandwich.
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Old 07-12-18, 02:33 PM
  #55  
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Originally Posted by livedarklions View Post
Plus you can drill holes in the sandwich.
Not if you want to retain the mustard - better to cut the crusts off. But I would recommend the factory drilled line of Swiss cheeses.
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Old 07-12-18, 02:38 PM
  #56  
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Originally Posted by AlmostTrick View Post
This is why I always struggle on whether or not to bring a sandwich on my rides. Without one, I can finish the ride just fine. But if I do bring along a sandwich, the extra weight ensures that I'll run out of fuel at some point and need to eat it.
Originally Posted by Kontact View Post
If you put it in your pocket, then it won't count as bike weight and there is no problem.
Originally Posted by livedarklions View Post
Plus you can drill holes in the sandwich.
Originally Posted by Kontact View Post
Not if you want to retain the mustard - better to cut the crusts off. But I would recommend the factory drilled line of Swiss cheeses.
Glad to see you bunch are taking this discussion seriously.


Carry on.
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Old 07-12-18, 02:39 PM
  #57  
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Originally Posted by Kontact View Post
Not if you want to retain the mustard - better to cut the crusts off. But I would recommend the factory drilled line of Swiss cheeses.

MUSTARD?!?!?! Do you have any idea how much weight condiments add?
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Old 07-12-18, 02:43 PM
  #58  
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Originally Posted by livedarklions View Post
MUSTARD?!?!?! Do you have any idea how much weight condiments add?
Like tubeless sealant, you just have to pay the weight penalty if you don't want tomato juice everywhere.

We're not barbarians.
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Old 07-12-18, 02:52 PM
  #59  
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Originally Posted by Kontact View Post
Like tubeless sealant, you just have to pay the weight penalty if you don't want tomato juice everywhere.

We're not barbarians.

Serious bikers' sandwiches contain nothing non-caloric. Aioli, maybe, but not mustard.
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Old 07-12-18, 02:53 PM
  #60  
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Originally Posted by Kontact View Post
Not if you want to retain the mustard - better to cut the crusts off. But I would recommend the factory drilled line of Swiss cheeses.
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Old 07-12-18, 02:55 PM
  #61  
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How has this conversation gone on so long?

It takes more power to move a heavier object up a gradient.
It takes more power to accelerate a heavier object.
It takes more fuel to produce more power.
Period.

Its basic physics.
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Old 07-12-18, 03:00 PM
  #62  
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Originally Posted by deapee View Post
How has this conversation gone on so long?

It takes more power to move a heavier object up a gradient.
It takes more power to accelerate a heavier object.
It takes more fuel to produce more power.
Period.

Its basic physics.

Clearly you haven't heard of Pyramid Power!

Free Energy (Pyramids)

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Old 07-12-18, 03:20 PM
  #63  
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Originally Posted by deapee View Post
How has this conversation gone on so long?

It takes more power to move a heavier object up a gradient.
It takes more power to accelerate a heavier object.
It takes more fuel to produce more power.
Period.

Its basic physics.
And this is where the application of knowledge is so very important. No one on this thread said any of the basic truths of physics weren't true, they simply pointed out, very factually, the minuscule percentage of affect the weight of a bike has when the weight of the rider is added to the equation.
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Old 07-12-18, 04:04 PM
  #64  
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Originally Posted by deapee View Post
How has this conversation gone on so long?

It takes more power to move a heavier object up a gradient.
It takes more power to accelerate a heavier object.
It takes more fuel to produce more power.
Period.

Its basic physics.
Because it really isn't a question of basic physics, but whether the basic physics has an impact at the scale human beings are working in.

EVERYONE here knows that it takes more energy to lift a heavier thing. It doesn't even need to be said.
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Old 07-12-18, 04:20 PM
  #65  
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Originally Posted by phughes View Post
I tried that, but because the tires are not that big, it didn't have enough of an effect. I then emptied on of my panniers and put a large helium balloon in it. That had an effect, but unfortunately a bad one. My bike was completely out of balance and I had a bad wreck. A month later, after recovering from my injuries, I tried again. This time I wanted to attach a ballon to my rear rack, centered this time, but learning from my earlier mistake, I also added on to the front rack. Success! The bike feels much lighter, but I have to be careful when parking the bike, if I don't have a load in the panniers. If the bike is not sufficiently tied down, it will float away. (Don't ask how I know, just suffice to say it pays to carry a BB gun.)
Proof that going back to the drawing board works. Well done!
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Old 07-12-18, 04:26 PM
  #66  
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Originally Posted by deapee View Post
How has this conversation gone on so long?

It takes more power to move a heavier object up a gradient.
It takes more power to accelerate a heavier object.
It takes more fuel to produce more power.
Period.

Its basic physics.
Now for the applied physics.

If riding a 20lb bike 2km's makes you want to eat one pop tart, will riding a 30lb bike mean you'll need to eat two?
My answer is no.

If you ride those same two bikes 200km's the answer may be different.

Context.
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Old 07-12-18, 04:32 PM
  #67  
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Originally Posted by deapee View Post
How has this conversation gone on so long?

It takes more power to move a heavier object up a gradient.
It takes more power to accelerate a heavier object.
It takes more fuel to produce more power.
Period.

Its basic physics.
What? A bicycle in real life is anything but basic. Not disagreeing, except for the period.

​​​​​​Aero is everything (on the windy plains)

People tired of winter in the southern hemisphere have better trolling abilities I've noticed

Gonna go ride now, it's super nice out
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Old 07-12-18, 07:25 PM
  #68  
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How much more fuel does an uncomfortable bike make you need to eat?
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Old 07-12-18, 08:05 PM
  #69  
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Has anyone mentioned yet, to answer the OP question, that you're probably going slower on the heavier bike (because it's just not worth the extra effort if the hills and stoplights are slowing you down anyway), and because of the slower speed the calories per mile may be less than they would be on a lighter bike?

For example, I'm likely to be 3-4 mph slower riding to work on my heavy fixed gear commuter than on my lighter road bike, Maybe 30 or 40 watts less. The heavier bike takes less fuel in my case.
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Old 07-13-18, 02:55 AM
  #70  
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Originally Posted by hillyman View Post
Only thing I know is;
1) I'd rather push a Prius up a hill than a van
2) all winning bikes at Tour de France don't have valve caps on them.
hope this helps
Have you seen how many wheels they have? 8 riders means 8 bikes and 16 wheels. Two team cars each with 8 spare bikes on them (so that's another 32 wheels). Plus spare wheels in each team car (maybe another 10-12 wheels). So every day they have to check the pressure for maybe 60 wheels. No one's got time to be messing about with valve caps with that much work to do.
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Old 07-13-18, 05:20 AM
  #71  
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I'm now convinced that weight of the bike is the only factor that matters, so I will be doing all my riding on the moon. That eliminates 5/6 of the bike's weight. Bonus, no air resistance. Speed, baby, speed!!!!
Can anyone recommend a good moon tire?
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Old 07-13-18, 05:23 AM
  #72  
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Originally Posted by livedarklions View Post
I'm now convinced that weight of the bike is the only factor that matters, so I will be doing all my riding on the moon. That eliminates 5/6 of the bike's weight. Bonus, no air resistance. Speed, baby, speed!!!!
Can anyone recommend a good moon tire?

Surly was ahead of their time:

https://surlybikes.com/bikes/legacy/...er_special_ops
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Old 07-13-18, 06:11 AM
  #73  
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I'm not a smallish man and don't have a tour physique but I can tell a difference between riding my steel bike bike vs my carbon bike. there is probably a 10# difference between the two and relative to my weight that is not a huge difference. It's also surprising how much faster my steel bike is since upgrading wheels/tires with just a minimal weight savings. It's also surprising how my speed increases with every 5lbs of body weight I lose. The lower weight is most noticeable when climbing, so I guess if you ride on flat ground weight is not a large factor.

I am faster downhill
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Old 07-13-18, 06:44 AM
  #74  
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Originally Posted by Metieval View Post
I really don't care what the opinions are.

I side with Physics on the matter. It takes more energy to move more weight, all else being equal.
So what? Who cares what straw man argument you "side with"?
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Old 07-13-18, 06:55 AM
  #75  
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Originally Posted by Marcus_Ti View Post

Those tires would definitely burst in a vacuum,
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