Stages Left Power Meter ADC Value Changes
11-15-20, 03:57 PM
#1
Newbie
Thread Starter
Join Date: Jul 2010
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 33 Times
in
12 Posts
Stages Left Power Meter ADC Value Changes
I just picked up a Stages Left Power Meter. I zero' cal'ed it off the bike to check that value and received an 882. Right after installation though, the ADC value changed to 843. That feels like a huge change.
Has anyone had their calibration value change significantly after installing the left crank?
Has anyone had their calibration value change significantly after installing the left crank?
11-15-20, 04:52 PM
#2
Senior Member
Join Date: Jan 2010
Location: TC, MN
Posts: 39,520
Bikes: R3 Disc, Haanjo
Mentioned: 354 Post(s)
Tagged: 1 Thread(s)
Quoted: 20810 Post(s)
Liked 9,456 Times
in
4,672 Posts
Why even check it when it's not installed? 843 is within the expected range - just ride it.
11-15-20, 06:08 PM
#3
Newbie
Thread Starter
Join Date: Jul 2010
Posts: 54
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 33 Times
in
12 Posts
But yeah, in theory, it should be fine for now.
11-16-20, 09:06 AM
#4
Senior Member
Join Date: Jul 2018
Location: USA
Posts: 2,190
Bikes: Ti, Mn Cr Ni Mo Nb, Al, C
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 942 Post(s)
Liked 527 Times
in
349 Posts
to properly do the zero, the crank has to be in the 6 o'clock position. WhyFi is also correct about the range.
11-17-20, 02:35 PM
#6
LR÷P=HR
Join Date: Sep 2019
Location: SF Bay Area
Posts: 2,180
Bikes: 1981 Holdsworth Special, 1993 C-dale MT3000 & 1996 F700CAD3, 2018 Cervelo R3 & 2022 R5, JustGo Runt, Ridley Oval, Kickr Bike 8-)
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 867 Post(s)
Liked 1,204 Times
in
693 Posts
When you checked it off the bike, did you suspend it vertical with the pedal attached?
Zero cal has to be vertical and the weight of a pedal may slightly change the number.
Barry
A little off topic but here you go....
Last week my coach queried the power readings of my Stages R8000 dual and my Wahoo Kickr Bike.
(Note: the Wahoo Kickr BIKE, not a Kickr Trainer you attach a bike to).
Coach thought the Stages vs Kickr Bike numbers might be different and cause issue when comparing indoor/outdoor rides.
So, I borrowed a pair of Garmin Vector 3 pedals (dual).
I attached the pedals to the Road bike and compared Stages to Vector 3.
I attached the pedals to the Wahoo Kickr Bike and compared Kickr Bike internal power meter to Vector 3.
Across the range of powers I tested at, the Stages and Kickr were within ~1W or each other and the Vector 3 read about 2-3W higher.
I count that as a win, and well within the published margin of error for the devices.
He who has a watch knows the time, he who has two watches is never sure.
Well, I'm a lot more sure now.
8-)
Barry
Zero cal has to be vertical and the weight of a pedal may slightly change the number.
Barry
A little off topic but here you go....
Last week my coach queried the power readings of my Stages R8000 dual and my Wahoo Kickr Bike.
(Note: the Wahoo Kickr BIKE, not a Kickr Trainer you attach a bike to).
Coach thought the Stages vs Kickr Bike numbers might be different and cause issue when comparing indoor/outdoor rides.
So, I borrowed a pair of Garmin Vector 3 pedals (dual).
I attached the pedals to the Road bike and compared Stages to Vector 3.
I attached the pedals to the Wahoo Kickr Bike and compared Kickr Bike internal power meter to Vector 3.
Across the range of powers I tested at, the Stages and Kickr were within ~1W or each other and the Vector 3 read about 2-3W higher.
I count that as a win, and well within the published margin of error for the devices.
He who has a watch knows the time, he who has two watches is never sure.
Well, I'm a lot more sure now.
8-)
Barry
Last edited by Barry2; 11-17-20 at 02:49 PM.
