KS 70.3 Bike Elevation

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2013-01-29 11:46 AM

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Olathe, KS
Subject: KS 70.3 Bike Elevation

I'm guessing this may have been covered here before, but I couldn't seem to find anything.

I have a friend who is considering doing the Kansas 70.3 this year.  She asked me about the bike course, so I went and looked up my Garmin data.  I was surprised to see that my Garmin had measured 1,985 feet of elevation gain last year with correction disabled (2,275 with it enabled).  The official course map shows 1,184 feet of gain.

I know GPS data (at least from a 310xt) should not be considered precise by any means, but we're talking an error of 90%+.

To IMKS vets, what does your data show?  Has anyone raced it with a 910xt?  I think that device includes an altimeter.

2013-01-29 12:32 PM
in reply to: #4599726

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Subject: RE: KS 70.3 Bike Elevation
My 705 has 2218ft of gain and my 910 has 3083ft of gain with corrections enabled.  Disabled my 910 shows 2992ft of gain and the 705 2388ft of gain.  They both show the course at 55.10 miles.  Just tell her the last 20 miles suck.
2013-01-29 1:14 PM
in reply to: #4599789

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Subject: RE: KS 70.3 Bike Elevation

2012 - 2,556 ft

2011 - 1,572 ft

Both with same 310XT and I don't recall if its corrected or not.  I don't think I adjusted settings from year to year.  So there's 1000 feet of difference for you...

And the last 20 miles sucked?  I say nah nah... with that tailwind, the last 25 miles were GLORIOUS! Survive the first 35ish and tuck tail and pedal like the wind on the final 20!

2013-01-29 1:53 PM
in reply to: #4599726

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Olathe, KS
Subject: RE: KS 70.3 Bike Elevation

Wow, I had no idea that the Garmin elevation data was so worthless.  Why even include the feature?  Oh well.

Miles 35-39 or so (pointing due South) were the worst 4 miles I've ever spent on a bike.  I was so gassed when I turned around that I couldn't even enjoy the tailwind.  I just tried to stay upright and recover enough to make it up the hill at mile 50.

2013-01-29 3:25 PM
in reply to: #4599947

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Overland Park, KS
Subject: RE: KS 70.3 Bike Elevation

No way that's 2,000 feet.  Look at the course on mapmyride it should be closer to 1100-1200 feet.  If you ride enough, that course should not be considered hilly.  I think 1200 feet over 56 miles is not that bad.  Those little 1/4 to 1/2 mile hills won't get you on this course, your fitness level and energy management will.  The key to KS 70.3 is ride, ride, ride......then ride some more.  Hills during training is a bonus but I think getting those long rides in on the weekend is key and do lots of them.

http://www.mapmyride.com/routes/view/75364734

 

2013-01-29 5:43 PM
in reply to: #4599726

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Subject: RE: KS 70.3 Bike Elevation
It doesn't matter what your gadgets say. Keep,the HR or power @ 70-80% threshold and let it ride. I don't consider myself fast but the two times I did the yellow brick road I never considered dropping off my 53 chainring. It's a very forgiving coarse unless you go out to hard and don't hydrate.

2013-01-30 3:11 PM
in reply to: #4600342

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Overland Park, KS
Subject: RE: KS 70.3 Bike Elevation

montyzooma - 2013-01-29 5:43 PM It doesn't matter what your gadgets say. Keep,the HR or power @ 70-80% threshold and let it ride. I don't consider myself fast but the two times I did the yellow brick road I never considered dropping off my 53 chainring. It's a very forgiving coarse unless you go out to hard and don't hydrate.

Monty = Quadzilla, everybody else should use that small chainring as needed to keep power and HR where they are supposed to be.

Regarding accuracy of elevation data, as noted GPS elevation is questionable, Garmin's elevation corrections reference survey data for the given latitude/longitude, this is a great fix except when dealing with bridges and dams where you have to question if the survey was for the road surface or the terrain under/around the road surface, also in these situations small positional errors can result in large elevation changes.

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