I wouldn't say that 8-10% is that steep

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Discussion Overview

The discussion revolves around the concept of measuring steepness in terms of percentage gradients, particularly in the context of cycling. Participants explore the implications of these measurements, comparing them to degrees and discussing the perceived difficulty of various slopes.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions the steepness of an 8-10% incline, suggesting that it does not seem particularly steep without a comparison to degrees.
  • Another participant agrees that the percent measurement likely corresponds to a ratio, with 0% being horizontal and 100% being vertical, but expresses uncertainty about the standard use of percentages for steepness.
  • A participant clarifies that a 10% slope is equivalent to a 'One in Ten' incline, while a 45-degree slope is 100%, indicating that perceptions of steepness can vary.
  • Some participants note that the difficulty of a slope also depends on its length and the physical condition of the cyclist.
  • Experiences shared by participants indicate that steeper grades, such as 15%, require significant effort and technique to navigate, challenging the notion that a 10% slope is not steep.
  • One participant mentions that using percentage grades can be misleading, as steep slopes may appear less severe numerically than they feel in practice.

Areas of Agreement / Disagreement

Participants express differing views on the steepness of 8-10% gradients, with some finding them manageable while others emphasize the challenges they present. The discussion remains unresolved regarding the subjective experience of steepness and the effectiveness of percentage as a measurement.

Contextual Notes

There is a lack of consensus on the standardization of steepness measurements and how they relate to physical exertion in cycling. Participants also highlight the influence of individual fitness levels on the perception of slope difficulty.

TSN79
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My physics-teacher drew a parallel to cycling and said that hills that were round 8-10% steep were really tough to climb. What does this mean? Would 100% be vertical and 0% horizonatl? If so, I wouldn't say that 8-10% is that steep at all really...if it steepness was given in degrees I could see it better...
 
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I'm not so sure that using a percent is standard in measuring steepness, but I would imagine that your teacher probably means what you think, with 0% being 0 degrees and 100% being 90 degrees. I agree that it doesn't seem particularly steep for a cyclist, but I suppose that depends on the physical fitness of your teacher :smile:
 
TSN79 said:
Would 100% be vertical and 0% horizonatl?


No.

You'll often see gradients (especially on roads) as being given in terms of a ratio, ie 1 in 5, where for every 5 metres you go along, you'll go up 1 metre. (Mathematically, the gradient would be 1/5).

When you see a gradient expressed as a percentage, it's merely a different way of expressing this ratio, or fraction.

In this case, a 45 degree slope would be 100%, and the 10% slope which your teacher speaks of is a 'One in Ten' incline.

As an aside, in real life, gradients often look a lot worse than they really are. The steepest roads in the UK aren't much more severe than 1 in 4, and a 1 in 10 slope is indeed a bit of a slog!
 
Wow, thanks. I just can't seem to think that a 1 in 10 incline could be considered that steep, but then again I'm not a cyclist...and I guess you would get tired after some time.
 
The difficulty also depends on the total length of the slope. Try tackling a 1 in 10 slope for an hour or so, and see how you go. I think you'll find it fairly tough.
 
I've climbed some 15% grades on a touring bike. Even without any baggage, I had to get in my lowest gear, stand up out of the saddle, and pull up on the handlebars in order to exert enough force on the pedals to keep moving.
 
jtbell said:
I've climbed some 15% grades on a touring bike. Even without any baggage, I had to get in my lowest gear, stand up out of the saddle, and pull up on the handlebars in order to exert enough force on the pedals to keep moving.

... having similar fond memories. Overall using %-grades gives really steep slopes a "low percentage", a 10-15% slope certainly isn't gentle or doesn't look like it when you're starting your climb, so the measure is usually a bit distracting.
 

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