iBike?
05-27-10 | 11:36 AM
#77
05-27-10 | 11:56 AM
#78
Senior Member
Joined: Jun 2006
Posts: 1,586
Likes: 1
From: Atlanta, GA
Bikes: A couple
https://analyticcycling.com/DiffEqMotionKilo_Page.html
If the first five seconds of the power readings were off by 20% in one direction for the iBike unit, the overall impact on the average power over the 60-sec interval would be around 3%. I think this is a reasonable variation; near the claimed accuracy of a PT.
05-27-10 | 12:06 PM
#79
Making a kilometer blurry
Joined: May 2006
Posts: 26,170
Likes: 93
From: Austin (near TX)
Bikes: rkwaki's porn collection
Well, your assertion made me break out the spreadsheet and play with some numbers. I grabbed this kilo power profile from analyticcycling.com:
https://analyticcycling.com/DiffEqMotionKilo_Page.html
If the first five seconds of the power readings were off by 20% in one direction for the iBike unit, the overall impact on the average power over the 60-sec interval would be around 3%. I think this is a reasonable variation; near the claimed accuracy of a PT.
https://analyticcycling.com/DiffEqMotionKilo_Page.html
If the first five seconds of the power readings were off by 20% in one direction for the iBike unit, the overall impact on the average power over the 60-sec interval would be around 3%. I think this is a reasonable variation; near the claimed accuracy of a PT.
It's a big ~1400W-1500W blast followed by a pretty quick drop. The blast at the beginning is the difference between 675W and 825W for me (Cat 3 vs. Domestic Pro on the e-wang chart).
05-29-10 | 07:01 AM
#80
Isaias
Joined: Sep 2005
Posts: 5,182
Likes: 0
From: Essex, MD
Bikes: Ridley X-Fire (carbon, white)
Hmmm... seems PT can have issues, too--just sayin':
https://www.bikeforums.net/showthread...kind-of-output (from 05-28-10)
https://www.bikeforums.net/showthread...kind-of-output (from 05-28-10)
05-29-10 | 09:30 AM
#81
Making a kilometer blurry
Joined: May 2006
Posts: 26,170
Likes: 93
From: Austin (near TX)
Bikes: rkwaki's porn collection
Hmmm... seems PT can have issues, too--just sayin':
https://www.bikeforums.net/showthread...kind-of-output (from 05-28-10)
https://www.bikeforums.net/showthread...kind-of-output (from 05-28-10)
05-29-10 | 09:30 AM
#82
Making a kilometer blurry
Joined: May 2006
Posts: 26,170
Likes: 93
From: Austin (near TX)
Bikes: rkwaki's porn collection
Hmmm... seems PT can have issues, too--just sayin':
https://www.bikeforums.net/showthread...kind-of-output (from 05-28-10)
https://www.bikeforums.net/showthread...kind-of-output (from 05-28-10)
06-16-10 | 12:01 PM
#83
Senior Member
Joined: Mar 2007
Posts: 288
Likes: 0
So, I bought a gen 3 Ibike a couple months ago. I bought the wired Pro version for like $420. My reasons for getting it instead of the Powertap Comp were 1) it's MUCH lighter and 2) the $230 difference.
I wish I could post something constructive about it, but I had to return it. It wouldn't work...at all.
The head unit wouldn't recognize the wired speed sensor. It took it on about 4 rides, and it would never work for more than a second or two. I tried everything; moving the sensor, swapping front wheels, reattaching the head unit a couple dozen times, but it never worked. I must have emailed Velocomp a dozen times. They were friendly, but ultimately not helpful at all. And a little patronizing.
So I returned the unit to them. They sent the same unit back to me, with a note scrawled at the bottom of the letter I sent telling me to do a sensor scan. Tried, didn't help. Returned the unit to where it came. This whole ordeal was about 4 weeks. I was without any training data while that unit was on my bike. I have since reattached my Polar CS200 and am back to training by HR. I will think about getting the PT Comp, but I don't have the time to fuss with it right now. My time is precious and the iBike wasted a whole lot of it. I'll never go back to that product or that company. Sorry, you've got one shot to get it right at that price.
I wish I could post something constructive about it, but I had to return it. It wouldn't work...at all.
The head unit wouldn't recognize the wired speed sensor. It took it on about 4 rides, and it would never work for more than a second or two. I tried everything; moving the sensor, swapping front wheels, reattaching the head unit a couple dozen times, but it never worked. I must have emailed Velocomp a dozen times. They were friendly, but ultimately not helpful at all. And a little patronizing.
So I returned the unit to them. They sent the same unit back to me, with a note scrawled at the bottom of the letter I sent telling me to do a sensor scan. Tried, didn't help. Returned the unit to where it came. This whole ordeal was about 4 weeks. I was without any training data while that unit was on my bike. I have since reattached my Polar CS200 and am back to training by HR. I will think about getting the PT Comp, but I don't have the time to fuss with it right now. My time is precious and the iBike wasted a whole lot of it. I'll never go back to that product or that company. Sorry, you've got one shot to get it right at that price.
06-16-10 | 02:56 PM
#84
slow up hills
Joined: Mar 2006
Posts: 4,931
Likes: 0
From: Seattle, WA
Bikes: Giant TCR, Redline CX, Ritchey Breakaway, Spec S-works epic
So, I bought a gen 3 Ibike a couple months ago. I bought the wired Pro version for like $420. My reasons for getting it instead of the Powertap Comp were 1) it's MUCH lighter and 2) the $230 difference.
I wish I could post something constructive about it, but I had to return it. It wouldn't work...at all.
The head unit wouldn't recognize the wired speed sensor. It took it on about 4 rides, and it would never work for more than a second or two. I tried everything; moving the sensor, swapping front wheels, reattaching the head unit a couple dozen times, but it never worked. I must have emailed Velocomp a dozen times. They were friendly, but ultimately not helpful at all. And a little patronizing.
So I returned the unit to them. They sent the same unit back to me, with a note scrawled at the bottom of the letter I sent telling me to do a sensor scan. Tried, didn't help. Returned the unit to where it came. This whole ordeal was about 4 weeks. I was without any training data while that unit was on my bike. I have since reattached my Polar CS200 and am back to training by HR. I will think about getting the PT Comp, but I don't have the time to fuss with it right now. My time is precious and the iBike wasted a whole lot of it. I'll never go back to that product or that company. Sorry, you've got one shot to get it right at that price.
I wish I could post something constructive about it, but I had to return it. It wouldn't work...at all.
The head unit wouldn't recognize the wired speed sensor. It took it on about 4 rides, and it would never work for more than a second or two. I tried everything; moving the sensor, swapping front wheels, reattaching the head unit a couple dozen times, but it never worked. I must have emailed Velocomp a dozen times. They were friendly, but ultimately not helpful at all. And a little patronizing.
So I returned the unit to them. They sent the same unit back to me, with a note scrawled at the bottom of the letter I sent telling me to do a sensor scan. Tried, didn't help. Returned the unit to where it came. This whole ordeal was about 4 weeks. I was without any training data while that unit was on my bike. I have since reattached my Polar CS200 and am back to training by HR. I will think about getting the PT Comp, but I don't have the time to fuss with it right now. My time is precious and the iBike wasted a whole lot of it. I'll never go back to that product or that company. Sorry, you've got one shot to get it right at that price.
