Wazzup Wit Da BigBear Elevation?
06-15-09 | 09:41 PM
#1
Thread Starter
Banned.
Joined: Dec 2005
Posts: 19,894
Likes: 5
From: Upland Ca
Bikes: Lemond Chambery/Cannondale R-900/Trek 8000 MTB/Burley Duet tandem
Wazzup Wit Da BigBear Elevation?
Seems th first time I did the ride it was 10,000 ft. Next two times it was 9,800 ft. This time the patch says 9,000 ft!
Are the mountains shrinking or more accurate instruments?
Are the mountains shrinking or more accurate instruments?
06-16-09 | 01:15 PM
#8
Old & Getting Older Racer
Joined: Jan 2006
Posts: 5,343
Likes: 12
From: SoCal
Bikes: Bicycle Transportation: 2022 Hyundai Kona Electric, 2019 Kia Niro Plug-In Hybrid
__________________
Thanks.
Cleave
"Real men still wear pink."
Visit my blog at https://cleavesblant.wordpress.com/
Lightning Velo Cycling Club: https://www.lightningvelo.org/
Learn about our Green Dream Home at https://www.lawville.org/
Thanks.
Cleave
"Real men still wear pink."
Visit my blog at https://cleavesblant.wordpress.com/
Lightning Velo Cycling Club: https://www.lightningvelo.org/
Learn about our Green Dream Home at https://www.lawville.org/
06-16-09 | 01:37 PM
#9
www.ocrebels.com
Joined: Aug 2006
Posts: 6,186
Likes: 8
From: Los Angeles area
Bikes: Several bikes, Road, Mountain, Commute, etc.
I may be over-thinking this, but when I start the ride I "set" the bike computer to current altitude, which it "knows" from barometric pressure. It senses differences in barometric pressure as changes in altitude.
If, however, the barometric pressure changes due to weather (like it did on The Bear this year) the bike computer gets all confused because it "thinks" the change is due to a change in altitude . . . which some of it is, but not all of it.
So, if there are dramatic changes in the weather during a ride, it can play with the accuracy of the altitude functions of the bike computer. That's my guess, anyway. I could be wrong!
Rick / OCRR
If, however, the barometric pressure changes due to weather (like it did on The Bear this year) the bike computer gets all confused because it "thinks" the change is due to a change in altitude . . . which some of it is, but not all of it.
So, if there are dramatic changes in the weather during a ride, it can play with the accuracy of the altitude functions of the bike computer. That's my guess, anyway. I could be wrong!
Rick / OCRR
06-16-09 | 02:05 PM
#11
www.ocrebels.com
Joined: Aug 2006
Posts: 6,186
Likes: 8
From: Los Angeles area
Bikes: Several bikes, Road, Mountain, Commute, etc.
Zackly Beanz!
He started out riding in a Low Pressure System and as he rode, he cycled right into a High Pressure System and Bingo . . . his altimeter went all funny
.
I'm no meteorologist, so we should probably check with Jackie Johnson (who is really smart with weather stuff . . . I saw her on TV!).
Rick / OCRR
He started out riding in a Low Pressure System and as he rode, he cycled right into a High Pressure System and Bingo . . . his altimeter went all funny
. I'm no meteorologist, so we should probably check with Jackie Johnson (who is really smart with weather stuff . . . I saw her on TV!).
Rick / OCRR
06-16-09 | 11:31 PM
#13
Queen of France
Joined: Sep 2004
Posts: 3,799
Likes: 0
From: San Diego, CA
Bikes: Look 565, Trek 2120
06-19-09 | 01:46 AM
#14
Senior Member
Joined: Jul 2008
Posts: 649
Likes: 0
From: CA
https://popularscience.exportersindia...ges/562120.jpg
Barometers really aren't the most accurate means of measuring elevation.
Barometers really aren't the most accurate means of measuring elevation.
