Thank you for purchasing through links and ads on this site.
diglloyd Deal Finder...
Buy other stuff at
Upgrade the memory of your 2018 Mac mini up to 64GB
Organic Lab Tested Full Spectrum CBD
20% off with coupon code diglloyd20 at

100% organic non-GMO, no additives or preservatives.
Legal in all 50 states

SRM Power Smoothing

Last updated 2012-03-21 - Send Feedback
Related: Power Meter, Road Bikes, SRM

Even the minimum smoothing in the SRM Mac software (1%) hides power spikes and dips, which removes a lot of information about the actual workout intensity

In the example below, the smoothed graph shows that power never exceeded ~290 watts for the entire 12 hours (green line for power). Worse, the many power dips completely disappear in the smoothed graph. The minimum smoothing is still very heavy-handed.

The unsmoothed graph shows important insights into variability in the power output; the smoothed graph makes it appear that pedaling never stopped, even on 10 minute descents where pedaling was absent. This is highly misleading when analyzing power output.

It’s not clear what “1%” means in the context of an ~12 hour ride (does that mean smoothing 7.2 minutes out of a ~720 minute ride?). Perhaps. Because that would explain the loss of all highs and lows.

Smoothing really ought to be over some number of samples; one could choose 2, 5, 10, 30 second smoothing, and the resulting graph would then be much more revealing of the true effort, independent of the length of the exertion. Other graphical means could also be used to add subtle hints to the data “shape”.

Click for larger graphs.

Death Valley Double 11:45 double century — SRM graph with smoothing off
Death Valley Double 11:45 double century — SRM graph with smoothing on


See also Nikon wishlist
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 5 hours unless noted. Certain deals may last longer.
$3199 SAVE $200 = 5.0% $99 FREE ITEMS Canon EOS R Mirrorless with 24-105mm in Cameras: Mirrorless
$1632 SAVE $700 = 28.0% $165 GIFT CARD LG C8PUA 55" Class HDR UHD Smart OLED TV in Electronics: Televisions
$3097 SAVE $200 = 6.0% $77 FREE ITEMS Nikon D850 DSLR in Cameras: DSLR
$1797 SAVE $200 = 10.0% Pentax K-1 Mark II DSLR in Cameras: DSLR
$998 SAVE $400 = 28.0% Sony a7 II Mirrorless in Cameras: Mirrorless
$1798 SAVE $200 = 10.0% Sony a7R II Mirrorless in Cameras: Mirrorless
$3998 SAVE $500 = 11.0% Sony a9 Mirrorless in Cameras: Mirrorless
$5987 SAVE $1839 = 23.0% ZEISS Loxia 5-Lens Bundle in Lenses: Mirrorless
$11594 SAVE $3157 = 21.0% ZEISS Otus ZF.2 3-Lens Bundle in Lenses: DSLR | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__