Does Carrying Weight in a Trailer Make Cycling Easier or Harder?

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Discussion Overview

The discussion revolves around the effects of carrying weight in a trailer versus carrying the same weight on the bicycle itself. Participants explore how the distribution of weight affects cycling effort, stability, and rolling resistance, considering both theoretical and practical implications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether there is any difference in effort required between carrying a 6 kg box in a trailer versus being 6 kg heavier without the box.
  • Another participant raises the issue of how the coefficient of friction and the number of wheels affect rolling resistance, suggesting that the load distribution might influence the effort needed.
  • A later reply discusses the potential advantages of using a trailer, such as a lower center of gravity and the ability to use higher tire pressures, which could reduce rolling losses.
  • Concerns are expressed about the stability of the bicycle when carrying weight directly on it, which may require more effort to maintain balance.

Areas of Agreement / Disagreement

Participants express differing views on whether carrying weight in a trailer is easier or harder compared to carrying the weight on the bicycle itself. No consensus is reached, and multiple competing perspectives remain.

Contextual Notes

Participants reference the complexity of rolling resistance and its dependence on factors such as tire pressure and weight distribution, indicating that assumptions about these variables may affect the discussion.

Who May Find This Useful

Cyclists, physics enthusiasts, and individuals interested in the mechanics of cycling and load distribution may find this discussion relevant.

iustin.ouatu
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Hello! Yesyerday I saw a bycicle which had attached to its back a box on wheels. Supposing that the coeficient of friction is the same as the coeficient of friction at the surface between bike`s wheels and ground, what of the 2 following cases is worser for the cycler ( he has to make more effort) :
1. The box is 6 kg mass.
2. There is no box and the cycler is heavier than initial with 6 kg.
Thanks you!
 
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I don't see any reason why there should be any difference at all.
 
and/or how the coefficient of friction between wheels and ground comes makes a different...assuming all wheels rotate and non slip...
 
Ok so are we assuming that the total weight in each case is the same but in 1) it's spread over 4 wheels and in 2) it's spread over 2 wheels?

I thought that twice the load on half the number of wheels might give the same rolling resistance... However wikipedia suggests that even if you change tyre pressures rolling resistance isn't directly proportional to load so there might be a small difference.

http://en.wikipedia.org/wiki/Rolling_resistance#Depends_on_wheel_load
 
I see, so, you are getting real...I was thinking classical physics with rigid bodies (disc wheels) ;-)
 
One advantage of carrying the load in a trailer is that you can arrange for it to be lower to the ground. When you transport extra weight above the rear wheel it makes the bicycle less stable, and with the higher centre of gravity the cyclist has to work harder to keep the bike balanced. You could have higher pressure in the trailer tyres, reducing losses, because you aren't concerned with a comfortable ride for the trailer. When you carry extra weight on the bike the tyre flattens and makes peddling more difficult. To restore a rounder tyre you can pump it harder, but then your ride becomes harsh and uncomfortable (even if the tyre can take the high pressure).
 

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