Originally posted by Anthemyou would have to use a bit of trig if you were measuring distance travelled as i believe the ratio you want is (vertical change)/(horizontal change)
It's the ratio of vertical distance to horizontal distance.
So, for example, if you ride up a 10% grade for 10 miles, you climbed a total of 1 vertical mile.
Originally posted by forkedknightThanks, that makes it a lot clearer. So it is an asymptote approaching 90 degrees.
Nice little chart from the wikipedia entry on Grade (road):
Originally posted by forkedknightGoing to that wiki link that you recommended shows that 100% is 45 degrees, which confirms that the ratio in question is 'vertical change':'horizontal change' and not 'vertical change' : 'distance travelled'
No, he is correct, it is the ratio of elevation change to distance traveled.
Originally posted by sonhouseYes - approximately.
Thanks, that makes it a lot clearer. So it is an asymptote approaching 90 degrees.
So 9 percent is how many km up for 1 km of road? Just 9 percent of 1 km? 90 meters?
Originally posted by wolfgang59But his statement, driving 10 miles up a 10 % climb puts you 1 mile in the air is wrong because 'driving 10 miles' is actually the hypotenuse of the resultant triangle? So that ten mile drive would actually be covering somewhat less distance of horizontal travel?
Going to that wiki link that you recommended shows that 100% is 45 degrees, which confirms that the ratio in question is 'vertical change':'horizontal change' and not 'vertical change' : 'distance travelled'
Your definition would be more useful but it is not correct.