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How to figure % grade.(6 posts)

How to figure % grade.mosovich
Apr 28, 2002 4:03 PM
When going up a hill, what's a good way to have and educated guess as to what % a grade the hill is?
Thanks!
With altimeter...tuffnick
Apr 28, 2002 6:25 PM
Its simple... rise over run... but ya without one its very difficult!
re: How to figure % grade.Breakfast
Apr 28, 2002 7:47 PM
Multiply the vertical distance (or gain) by 100, divide the total by the horizontal distance. The result is percentage of grade.

Example: 3000 ft. gain in 10 miles, 3000 x 100 = 30,000 / 52,800 (5,280 x 100) = .56 % grade
re: How to figure % grade.Breakfast
Apr 28, 2002 7:48 PM
Multiply the vertical distance (or gain) by 100, divide the total by the horizontal distance. The result is percentage of grade.

Example: 3000 ft. gain in 10 miles, 3000 x 100 = 30,000 / 52,800 (5,280 x 100) = 5.6 % grade

OOps! had to get decimal in right place!
re: How to figure % grade.Akirasho
Apr 29, 2002 12:41 AM
http://www.chainreaction.com/inclinometer.htm
http://www.adv-cycling.org/cgi-shl/webc.exe/advsales/st_prod.html?p_prodid=554&p_catid=32&sid=3C1Wd4ys
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1='5825665'.WKU.&OS=PN/5825665&RS=PN/5825665
http://patimg2.uspto.gov/.piw?Docid=05825665&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO1%2526Sect2%3DHITOFF%2526d%3DPALL%2526p%3D1%2526u%3D%2Fnetahtml%2Fsrchnum.htm%2526r%3D1%2526f%3DG%2526l%3D50%2526s1%3D'5825665'.WKU.%2526OS%3DPN%2F5825665%2526RS%3DPN%2F5825665&PageNum=&Rtype=&SectionNum=&idkey=DBF21A9DBE02

... as well as the tried and true, rise over run method.

We abide.

Remain In Light.
re: How to figure % grade.DougSloan
Apr 29, 2002 6:25 AM
For me:

flat ground=53x17 gear

5%=39x17

10%=39x21

15%=39x25, with standing

20%=39x27 or bigger, and the front wheel starts lifting