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

Thoughts on Power meters...???...

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

Thoughts on Power meters...???...

Old 08-13-12, 11:10 AM
  #26  
slowandsteady
Faster but still slow
 
slowandsteady's Avatar
 
Join Date: Jun 2006
Location: Jersey
Posts: 5,978

Bikes: Trek 830 circa 1993 and a Fuji WSD Finest 1.0 2006

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by svtmike View Post
Aero drag will change with rider position and possibly even with clothing changes (taking off a wind shell, for instance). Barometric pressure changes so altitude and therefore climbing data is compromised. The iBike relies on accelerometers that are bothered by bumps in the road.
Just ride the entire ride on the hoods.
slowandsteady is offline  
Old 08-13-12, 11:12 AM
  #27  
gregf83 
Senior Member
 
Join Date: Jun 2008
Location: Vancouver, BC
Posts: 9,201
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1185 Post(s)
Liked 286 Times in 174 Posts
Originally Posted by rkwaki View Post
I did a road race years ago (~130 miles) and believe I was down 6 pounds...
Sounds like a cagey old racer trying to get up the hills faster
gregf83 is offline  
Old 08-13-12, 11:23 AM
  #28  
rkwaki
soon to be gsteinc...
 
rkwaki's Avatar
 
Join Date: Oct 2010
Location: Nayr497's BFF
Posts: 8,564
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by gregf83 View Post
Sounds like a cagey old racer trying to get up the hills faster
It is what it is...
rkwaki is offline  
Old 08-13-12, 01:36 PM
  #29  
nhluhr
John Wayne Toilet Paper
 
nhluhr's Avatar
 
Join Date: Feb 2006
Location: Roanoke
Posts: 1,952

Bikes: BH carbon, Ritchey steel, Kona aluminum

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked 0 Times in 0 Posts
Originally Posted by Ghost Ryder View Post
I'm considering getting a comp/GPS/PM for my bike, & am considering the iBike iPro Gen III Power Meter.
What are your guys/gals thoughts on this device?
Anyone have any experience with this device?

https://ibikesports.com/ipro.html#page=page-1
I thought you said you were considering a power meter. This isn't a power meter. You'd be pissing money into the wind if you got something like this.
nhluhr is offline  
Old 08-13-12, 01:42 PM
  #30  
slowandsteady
Faster but still slow
 
slowandsteady's Avatar
 
Join Date: Jun 2006
Location: Jersey
Posts: 5,978

Bikes: Trek 830 circa 1993 and a Fuji WSD Finest 1.0 2006

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by gregf83 View Post
There are many other changes which occur in a ride. How does the iBike know if you're drafting in a group? Or what happens when you're riding along the road and a large truck rolls by? Those are just a couple of examples that will drastically alter the readings you get from a iBike meter.

My impression is that the iBike is a toy and if you're serious about training with power you'll be disappointed.
it measures the wind as I understand it. So it would know you were drafting by the fact that the frontal wind speed would be reduced.
slowandsteady is offline  
Old 08-13-12, 01:43 PM
  #31  
Elduderino2412
Tour De French Fries
 
Elduderino2412's Avatar
 
Join Date: Apr 2012
Location: Salt Lake City
Posts: 1,251

Bikes: 2010 Cervelo R3 SL & 2013 Airborne Goblin

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by slowandsteady View Post
it measures the wind as I understand it. So it would know you were drafting by the fact that the frontal wind speed would be reduced.
I had an Ibike, it doesn't do anything particularly well.
Elduderino2412 is offline  
Old 08-13-12, 01:48 PM
  #32  
bikepro
Senior Member
 
Join Date: Sep 2003
Location: Allen, TX
Posts: 1,916

Bikes: Look 585

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by DaveWC View Post
Absolutely, much better than IBike. I sold one just like this a couple months ago for around $425. The wired PowerTap is a very good entry level power meter. You have a single wire that runs from the chainstay to the handle bars. If you later decide to upgrade to something wireless, you can pretty much get your money back on ebay.

The IBike is good in theory, but I decided it has "too many moving parts". Once the PowerTap is installed, you're ready to ride.
bikepro is offline  
Old 08-13-12, 01:54 PM
  #33  
achoo
Senior Member
 
Join Date: Dec 2009
Posts: 4,700
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 5 Times in 4 Posts
Three riders on my team have iBikes.

Every one of them wishes they had saved the money and gotten a real power meter.
achoo is offline  
Old 08-13-12, 02:03 PM
  #34  
wphamilton
Senior Member
 
wphamilton's Avatar
 
Join Date: Apr 2011
Location: Alpharetta, GA
Posts: 15,280

Bikes: Nashbar Road

Mentioned: 71 Post(s)
Tagged: 0 Thread(s)
Quoted: 2933 Post(s)
Liked 336 Times in 224 Posts
Originally Posted by slowandsteady View Post
it measures the wind as I understand it. So it would know you were drafting by the fact that the frontal wind speed would be reduced.
How does it know what your drag is at a given moment, or what the ambient wind speed is?
wphamilton is offline  
Old 08-13-12, 02:08 PM
  #35  
hhnngg1
Senior Member
 
Join Date: Oct 2010
Posts: 3,456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 50 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Just a heads up for all you folks who are thinking about a PM but aren't sure it's for you.

If you have a trainer such as KK or Cycleops2, you can convert the speed to power with very high accuracy (like 95%+), which is above the ibike or the new Cycleops HR-based power accuracy. This is what trainerroad.com does, with great success. Just google the power/speed charts to find the equation or chart.

If you like training with those converted power numbers, there's a good chance that the PM will be to your liking. It's also an inexpensive way to get rough power number estimates of where you are without splurging on a whole PM if you only want to get a good sense of how much power you're putting out for a certain timed effort. Of course, this is limited because it's all on the trainer, and not outdoors.
hhnngg1 is offline  
Old 08-13-12, 02:09 PM
  #36  
slowandsteady
Faster but still slow
 
slowandsteady's Avatar
 
Join Date: Jun 2006
Location: Jersey
Posts: 5,978

Bikes: Trek 830 circa 1993 and a Fuji WSD Finest 1.0 2006

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by wphamilton View Post
How does it know what your drag is at a given moment, or what the ambient wind speed is?
I have no idea.
slowandsteady is offline  
Old 08-13-12, 02:10 PM
  #37  
Elduderino2412
Tour De French Fries
 
Elduderino2412's Avatar
 
Join Date: Apr 2012
Location: Salt Lake City
Posts: 1,251

Bikes: 2010 Cervelo R3 SL & 2013 Airborne Goblin

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by wphamilton View Post
How does it know what your drag is at a given moment, or what the ambient wind speed is?
It has a little sensor on the front of it that supposedly measures wind resistance, but it doesn't work very well. To many variables for it to be able to calculate w/that little sensor.
Elduderino2412 is offline  
Old 08-13-12, 02:55 PM
  #38  
gregf83 
Senior Member
 
Join Date: Jun 2008
Location: Vancouver, BC
Posts: 9,201
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1185 Post(s)
Liked 286 Times in 174 Posts
Originally Posted by slowandsteady View Post
it measures the wind as I understand it. So it would know you were drafting by the fact that the frontal wind speed would be reduced.
Yes. I was guilty of typing without thinking. I believe it still has issues with accurately determining the power when the wind is coming at different yaw angles.
gregf83 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
CanadianBiker32
Electronics, Lighting, & Gadgets
42
05-24-19 06:34 PM
BigPoser
Road Cycling
30
08-13-17 10:34 PM
whitemax
Road Cycling
6
06-02-17 09:50 AM
CanadianBiker32
Training & Nutrition
3
05-16-17 05:24 PM
NEUROSPORT
Road Cycling
18
05-31-10 10:41 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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.