Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Power in Ascent Software, Garmin Edge 705 and 305

Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Power in Ascent Software, Garmin Edge 705 and 305

Old 04-02-10, 11:07 AM
  #1  
bannned
Thread Starter
 
steaktaco's Avatar
 
Join Date: Jun 2005
Location: philadelphia
Posts: 2,228

Bikes: black bike, white bike, blue bike, yellow bike, silver bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Power in Ascent Software, Garmin Edge 705 and 305

All of last season, I used Ascent and Golden Cheetah in conjunction with a Garmin Edge 705. No issues.

The problem is I recently picked up XC and today I uploaded some data from my older Edge 305. Imagine my surprised when I saw data populating the power column of the Activity Viewer; especially when I wasn't even using a power meter.

Anyone know if Ascent has been estimating my power all along, instead of reading data from the 705?
__________________
steaktaco.com <-- poohoopsies.

steaktaco is offline  
Old 04-02-10, 11:20 AM
  #2  
Senior Member
 
Join Date: Aug 2005
Location: Lafayette, CO
Posts: 1,212

Bikes: MTB: Stumpjumper FSR, Road: De Rosa King 3

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have an edge 305, and I started using Ascent last fall. I swear that at that time, the power columns were always empty. But I just went and looked, and the power column is indeed filled in now. There have been some software updates in that time, so I guess it's an "added feature."
foresthill is offline  
Old 04-02-10, 11:25 AM
  #3  
Senior Member
 
Join Date: Aug 2005
Location: Lafayette, CO
Posts: 1,212

Bikes: MTB: Stumpjumper FSR, Road: De Rosa King 3

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
So, looking closer, if I turn on any of the watts columns, then the watts field in the HUD will have values. If I don't, then the watts field in the hud is empty. Weird.
foresthill is offline  
Old 04-02-10, 11:51 AM
  #4  
Mr. Sparkle
 
alpha_bravo's Avatar
 
Join Date: Feb 2009
Location: Sugar Land, TX
Posts: 534

Bikes: 08 Specialized Allez Elite

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 5 Times in 3 Posts
Originally Posted by steaktaco
Anyone know if Ascent has been estimating my power all along, instead of reading data from the 705?
The new version of Ascent 1.10 has the estimate for power. It's based on gradient, user + equipment weight, and speed. Not sure how accurate it is, but I'd love to hear from some of the power meter users out there.

On my home loop, I get a different gradient measurement on my uphill section each time. Sometimes it's as low as 4.6% (like today), others is as high as 6.9%. So I'm not sure how much stock I put in it, especially since wind can't be taken into account. Or at least that's how I reason my measly power output. . .
alpha_bravo is offline  
Old 04-02-10, 01:11 PM
  #5  
bannned
Thread Starter
 
steaktaco's Avatar
 
Join Date: Jun 2005
Location: philadelphia
Posts: 2,228

Bikes: black bike, white bike, blue bike, yellow bike, silver bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Alpha, do you know if Ascent defaults to the power data from a 705 if it is available?

I exported the rides in question to Golden Cheetah and found that Ascent included the "estimated" power data. Not good, since now I'm not sure I've been looking at my actual power data all along.
__________________
steaktaco.com <-- poohoopsies.

steaktaco is offline  
Old 04-02-10, 01:23 PM
  #6  
Mr. Sparkle
 
alpha_bravo's Avatar
 
Join Date: Feb 2009
Location: Sugar Land, TX
Posts: 534

Bikes: 08 Specialized Allez Elite

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 5 Times in 3 Posts
Originally Posted by steaktaco
Alpha, do you know if Ascent defaults to the power data from a 705 if it is available?

I exported the rides in question to Golden Cheetah and found that Ascent included the "estimated" power data. Not good, since now I'm not sure I've been looking at my actual power data all along.
Hmm... according to the guys at Montebello, it's supposed to default to the true power meter numbers if available. The estimate is only if no power data is available. This might be something you'd want to e-mail them about.

Originally Posted by Montebello Software
If available, Ascent will use power meter data when display/calculating power-related data. If data from a meter is not present, Ascent uses an algorithm to "guess" at the power output based on gradient, speed, cadence, and the weight of the rider + equipment used for the activity. The algorithm makes assumptions about drag from wind speed, rolling resistance, etc -- so its results should be taken with a large grain of salt, but some users are finding it useful.

The calculation is cycling-specific, so for anything else it probably makes little sense.
alpha_bravo is offline  
Old 04-02-10, 01:37 PM
  #7  
bannned
Thread Starter
 
steaktaco's Avatar
 
Join Date: Jun 2005
Location: philadelphia
Posts: 2,228

Bikes: black bike, white bike, blue bike, yellow bike, silver bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks, that link was very helpful.

It's rather disconcerting that Ascent plugs those estimated numbers directly into the activity data. I wonder if there's a way for the program to tell real and estimated data apart—like tagged somehow—so that one day they could implement a toggle that could hide approximated data. To be honest I'd rather see a blank on that column when I'm not using a power meter... because I know I didn't turn 1100 W last night.

I guess the next step would be to do a road ride with both the 305 and the 705 for comparison...
__________________
steaktaco.com <-- poohoopsies.

steaktaco is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jason70
Electronics, Lighting, & Gadgets
7
10-01-16 09:26 AM
Voodoo76
Road Cycling
6
04-21-16 08:54 PM
spessx
"The 33"-Road Bike Racing
11
02-15-12 12:36 PM
I_Like_Bike
Road Cycling
2
09-09-11 05:05 PM
grwoolf
Road Cycling
0
08-24-11 04:28 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.