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Post by taffytim on Feb 23, 2015 18:56:47 GMT
I'm now getting used to what percentage of assent is hard to which is impossible to my legs but what does the number actually mean?
Is it a percentage of 0-90 degrees? So would a 25% hill be 22.5 degrees?
I've been wondering for a while and today I was driving up a 12% hill (not cycling due to this bloody cold) and it looked far steeper than what I would think 11 degrees would look.
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Post by robertsims on Feb 23, 2015 19:01:27 GMT
My understanding (and very possibly wrong) is 25% means a 1 in 4 hill (in old language) and a 20% means 1 in 5 and 10% means 1 in 10 etc.
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Post by erictherat on Feb 23, 2015 19:48:21 GMT
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Post by erictherat on Feb 23, 2015 19:48:50 GMT
ps - thanks for sorting out a maths lesson for me this week.
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Post by Radchenister on Feb 23, 2015 20:14:53 GMT
Hot off my CAD machine ... the short side is a percentage of the long side, if you can't visualise the 1 in something gradients, then gawd help us, the human race is going backwards !
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Post by Radchenister on Feb 23, 2015 20:15:13 GMT
... now I really should be working !
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Post by Radchenister on Feb 23, 2015 20:29:02 GMT
Veloviewer use good colour gradations to assist with visualising a climb, too much hot stuff for too long and you know it's hard, the lighter bits are a bit of respite: We know all about gradients 'round these parts (the infamous Cheese-rolling):
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Post by mark072 on Feb 23, 2015 20:40:40 GMT
To put it simply and to give you an idea a 25% gradient (1 in 4) which is steep would go up 1 foot for every 4 foot across. A 1 in 3 climb (very steep!) would have a gradient on an angle that would go up 1 foot for every 3 feet across.
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Post by Radchenister on Feb 23, 2015 20:43:39 GMT
Pythagoras is probably rolling himself now ...
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Post by robertsims on Feb 23, 2015 22:25:31 GMT
I'm now getting used to what percentage of assent is hard to which is impossible to my legs but what does the number actually mean? Is it a percentage of 0-90 degrees? Β So would a 25% hill be 22.5 degrees? I've been wondering for a while and today I was driving up a 12% hill (not cycling due to this bloody cold) and it looked far steeper than what I would think 11 degrees would look. They always seem steeper but a 12% hill is actually only about 6-7 degrees!
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Post by Rocket on Feb 23, 2015 22:30:46 GMT
That's why people like percentages. They are bigger than the angle. Same thing with Km over miles. I do of course like my climbing in feet rather than metres though
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Post by taffytim on Feb 24, 2015 1:59:09 GMT
oh ok, so when im looking on bike hike and trying desperately to avoid anything over 10% then the actual angle of the road that is giving me the frighteners is less than 6 degrees. . . . . woooaahhh that's pathetic. I am never admitting this fact to any non cyclist!! haha So the worlds steepest hill is only 19 degrees, these low numbers are very unimpressive, no wonder why we use the percentage system. When you see photos of the hills of San Francisco you think the trams are travelling up 45degree slopes!! Im not one to normally alter my measurement units to impress (people who do KM on Strava make me laugh) but I will be leaving this little discovery out of all conversations
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Post by Radchenister on Feb 24, 2015 2:29:04 GMT
KMs are the format of cycle racing from the continent, they're incrementally just that little bit more accurate and suited to the distance and pace of cycling - I convert back for non cyclists only but think in them for cycling, as that's what cyclists / cycling fans do, it's part of the culture . I work all day at various scales juggling distances and calc's, they're just systems. We won't mention that there's only a handful on here who can ride over 21 mph for an hour though of course .
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Post by Radchenister on Feb 24, 2015 2:34:44 GMT
Same goes for percentages v 1 in whatever, more incrementally accurate and suits cycling just great, Luddites won't agree I realise ...
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Post by r0b1et on Feb 24, 2015 10:30:59 GMT
Apparently I too am a modern man. km makes so much more sense than miles for cycling.
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