Go Back  Bike Forums > Bike Forums > Electronics, Lighting, & Gadgets
Reload this Page >

Rally XC100 pedals vs. PowerTap

Notices
Electronics, Lighting, & Gadgets HRM, GPS, MP3, HID. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets.

Rally XC100 pedals vs. PowerTap

Old 06-13-22, 10:27 PM
  #1  
hayden52
Junior Member
Thread Starter
 
Join Date: Oct 2011
Location: Dallas, TX
Posts: 90
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 24 Times in 12 Posts
Rally XC100 pedals vs. PowerTap

I recently acquired a set of Rally XC100 power pedals and was curious how the power measurement compared with my PowerTap hub, so I did a ride with my wife's Garmin paired to the PowerTap and my Wahoo! Elmnt paired to the pedals and uploaded both rides to Strava to compare. I also made a spreadsheet and graphed the results. What I noticed is that the pedals seem to smooth the data more than the hub, and (surprisingly) the hub measured about 4% higher. Maybe because the pedals only measure my left leg and double it, and there may be an imbalance. Here're the data:

Here are the links to the Strava rides:

Strava PowerTap
Strava Rally XC100

Cheers,
Gabe Cardona
hayden52 is offline  
Likes For hayden52:
Old 06-14-22, 07:18 AM
  #2  
OshkoshBiker
Junior Member
 
Join Date: Oct 2015
Location: Oshkosh, WI
Posts: 77

Bikes: DB Haanjo Comp, Trek 1.2, Murray MTB, Framed Minnesota 2.0, Top Fuel 8

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked 9 Times in 6 Posts
Originally Posted by hayden52 View Post
I recently acquired a set of Rally XC100 power pedals and was curious how the power measurement compared with my PowerTap hub, so I did a ride with my wife's Garmin paired to the PowerTap and my Wahoo! Elmnt paired to the pedals and uploaded both rides to Strava to compare. I also made a spreadsheet and graphed the results. What I noticed is that the pedals seem to smooth the data more than the hub, and (surprisingly) the hub measured about 4% higher. Maybe because the pedals only measure my left leg and double it, and there may be an imbalance. Here're the data:

Here are the links to the Strava rides:

Strava PowerTap
Strava Rally XC100

Cheers,
Gabe Cardona
If you like to delve into the topic further, do a Bland-Altman Analysis. You already have the spread sheet and it is easy to do. Look at the scatter plot and see if there is a bias. You can also plot a histogram of each power meter one over the other and see how the shape of the distributions differ.
OshkoshBiker is offline  

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.