You are climbing up a hill, exhausted and look down on your computer. It says the climb (incline) is 6% grade. What does that mean? 6% sounds like little, but you are definitely feeling it.
When you go to mapmyride.com and see the elevation chart for a route, parts of it is 4% grade average, but there is a mile section where it's 9% grade average. Is this route hard?
Let's talk about elevation chart. What about sex and lies? Well. I hate to break it to you, but every time I put anything remotely sensational in my title, everyone jumps on it to read my blog. So, it's just a bait. I'm not talking about sex or lies. Well. A little about lies. But more on that later.
First of all. What does 6% grade mean?
It means that the height (elevation) difference between 2 points is 6 feet over 100 feet. Say, point A is at sea level (0') and point B is 100' away from point A. And, point B is 6' higher than point A. Make sense? See the picture below.
Yes. I drew this angle using Vectorworks, which is the CAD program I use at work. This is what I do for work. Not to draw angles, but to draft things on the computer. OK. I know. I'm a big dork.
As you can see, I measured the angle between 2 lines... 6% grade means, it's a 3.43% angle. So, that's what 6% grade means. Cool?
Whew. Complicated. Let me grab a beer. My thinking part hurts.
OK. Back now.
Next. How to read an elevation chart??
As I mentioned earlier, you might see a route map with an elevation chart. And, there's a mile of 8% grade average. This is tricky. Why?
Because 8% average could mean half a mile of 7% grade and another half mile of 9% grade. Or worse, half a mile of 6% grade and half a mile of 10% grade. You see? Averaging the grade of each incline for a chart could sort of homogenize all the individual spikes in the elevation and make it look easier (or harder depending on where you stand on how much you like to climb). No matter how short it is, 12% grade incline could be quite challenging after a long day of ride...
For me I'm ok up to about 7% grade chugging along, and then I hit 8% incline and I blow up. My friend, who loves to climb, she probably doesn't even feel anything at 8%. So there you go. This is why you can never trust an elevation chart. First, you can't really know what's going on, second, it's really up to how your climbing skills are.
Elevation charts lie. I always hate myself for thinking, "8% grade! Suuuure. No problem." That's what happened to me this weekend. I was in the Santa Monica Mountains climbing up on Latigo at a record (slow) speed and wondered whose idea it was to do this route. It was mine.
Stupid.
Here's the route. Make sure you click on the "show elevation" box to see what I'm talkin' bout. Just by looking at it, it ain't too bad, right? Oh, yes. It's bad. Elevation charts should never be trusted... always expect it to be worse.
Oh by the way, I'm not supposed to say I don't like to climb or I suck at climbing.
It's all in the head.
I love hills. I love climbing. I love...
Stay positive and ride safe!