Shimano R9100-P Powermeter

Discuss light weight issues concerning road bikes & parts.
mds
Posts: 199
Joined: Sat Dec 13, 2008 6:28 pm
Location: California

by mds

nemeseri wrote:
Mon Mar 12, 2018 6:45 pm
Can you go into details in what way it works better?
IMO Shimano data is clean. SRM data is more noisy with dropouts, see pic.
SRM.jpg
2009 Look 595

scb
Posts: 95
Joined: Wed May 27, 2009 4:16 pm

by scb

Glad I saw this thread. I was getting ready to order this. Now, I’ve got to re-think my power meter.


hogehoge
Posts: 35
Joined: Mon Feb 25, 2013 11:59 pm

by hogehoge

mds wrote:
Mon Mar 12, 2018 8:27 pm
nemeseri wrote:
Mon Mar 12, 2018 6:45 pm
Can you go into details in what way it works better?
IMO Shimano data is clean. SRM data is more noisy with dropouts, see pic.

SRM.jpg
This is just the 9100P data? Do you have SRM data for comparison?
Also do find the 9100P gives lower readings than your SRM?

mds
Posts: 199
Joined: Sat Dec 13, 2008 6:28 pm
Location: California

by mds

hogehoge wrote:
Tue Mar 13, 2018 4:20 am
mds wrote:
Mon Mar 12, 2018 8:27 pm
nemeseri wrote:
Mon Mar 12, 2018 6:45 pm
Can you go into details in what way it works better?
IMO Shimano data is clean. SRM data is more noisy with dropouts, see pic.

SRM.jpg
This is just the 9100P data? Do you have SRM data for comparison?
Also do find the 9100P gives lower readings than your SRM?
That pic shows SRM power / cadence data. Shimano not lower.

Here is Shimano data for comparison. Less noise no drops.
Shimano.jpg
Last edited by mds on Tue Mar 13, 2018 1:42 pm, edited 7 times in total.
2009 Look 595

guyc
Posts: 294
Joined: Thu Mar 24, 2011 9:40 am
Location: Hampshire, England
Contact:

by guyc

I’m currently tossing up between this and the new 4iii Podium dual-sided. The latter is £249 cheaper here.

moyboy
Posts: 142
Joined: Thu Aug 18, 2016 12:19 am

by moyboy

Noticed Bike Radar just posted there impressions / review of the 9100-p
Accuracy is there but the L / R split isn't.

Anyone else experience that?

mds
Posts: 199
Joined: Sat Dec 13, 2008 6:28 pm
Location: California

by mds

moyboy wrote:
Tue Mar 13, 2018 12:57 pm
Anyone else experience that?
So far I don't see an error. My split varies with zone. Typically 50.5% in Z4, 52.5% in Z1. Total in both zones matches Tacx Neo Smart trainer power within 2 or 3%.

Here is an example showing Shimano versus Tacx target, average difference is 2%.
Analysis.png
2009 Look 595

nemeseri
Posts: 640
Joined: Tue Apr 07, 2015 5:40 pm

by nemeseri

mds wrote:
Tue Mar 13, 2018 1:53 pm
Here is an example showing Shimano versus Tacx target, average difference is 2%.
How long have you been using the shimano PM?

mds
Posts: 199
Joined: Sat Dec 13, 2008 6:28 pm
Location: California

by mds

nemeseri wrote:
Tue Mar 13, 2018 9:11 pm
mds wrote:
Tue Mar 13, 2018 1:53 pm
Here is an example showing Shimano versus Tacx target, average difference is 2%.
How long have you been using the shimano PM?
4 months, 4000 km. Previous PM for 6 years was SRM.
2009 Look 595

User avatar
ms6073
Posts: 2369
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

Have not downloaded the data for my first 4 rides, but as previous poster, the power output of my Shimano powermeter is similar to my SRM DA 9000, both of which measure to within 1-2% of my Tacx Neo, yet the Shimano PM is a tad lighter, rechargeable, not to mention US $1500 less than my SRM!
moyboy wrote:
Tue Mar 13, 2018 12:57 pm
Accuracy is there but the L / R split isn't.
Aside from helping address fit issues for someone with a demonstrated physiological impediment, why do we care so much about L/R balance? As long as the metrics are repeatable, aside from possibly riding on a trainer with the original power cranks, there are as yet to be any proven training regimens to correct such imbalances.
Last edited by ms6073 on Wed Mar 14, 2018 4:35 pm, edited 1 time in total.
Michael - The Anaerobic Threshold is neither...

guyc
Posts: 294
Joined: Thu Mar 24, 2011 9:40 am
Location: Hampshire, England
Contact:

by guyc

ms6073 wrote:
Wed Mar 14, 2018 2:04 pm
Aside from someone with a demonstrated physiological impediment where this might help in addressing fit issues, why do we care so much about L/R balance? As long as the metrics are repeatable, aside from possibly training on a trainer with the original power cranks, there are as yet to be any proven training regimens to correct such imbalances.
I've wondered this as well. I've read some comments that trying to correct an imbalance can cause more problems than it solves....

User avatar
ms6073
Posts: 2369
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

guyc wrote:
Wed Mar 14, 2018 2:52 pm
I've read some comments that trying to correct an imbalance can cause more problems than it solves....
Sort of topic drift, but I recall reading about someone who suffered a serious injury that required hip replacement surgery. As part of the recovery, a coach had him ride on a CompuTrainer and SpinCast apparently indicated a significant imbalance, possibly due to a leg length discrepancy after the surgery. The coach suggested power cranks (PCs) which have cams such that you can only pull up, not push down during a pedal stroke, and despite hours training with those things and a brief return to racing, long term it didn't help.

Image
Michael - The Anaerobic Threshold is neither...

ODC
Posts: 73
Joined: Mon Aug 14, 2017 9:40 am

by ODC

Someone knows where you can buy the magnets?
Lost the black cover + magnet on a rainy ride. Dealer (Belgium) called for it and Shimano says 11 weeks for a magnet kit!!!!!!!! What a bullshit. So i cannot ride with power because of their stupid magnets...

zirxo
Posts: 150
Joined: Wed Mar 19, 2014 12:46 pm

by zirxo

It's a magnet so any old magnet should work as long as you can get it in the correct spot.

petal666
Posts: 864
Joined: Fri Dec 12, 2008 5:19 am
Location: Brisbane, Oz
Contact:

by petal666

Rare earth magnet from ebay, or any old magnet.


Post Reply
  • Similar Topics
    Replies
    Views
    Last post