CdaCrr - Bike computer with aerodynamic drag 2.2.3

  Continue to app

Publisher Description

Bike computer to ride faster by improving your aerodynamic position and testing gear/equipment. Among other data, it monitors CdA (drag*area) and Crr (rolling resistance) coefficients, during races or dedicated testing sessions.

an Android smartphone
with built-in ANT+ support
(or you would need an
ANT+ adapter
) and sensors for speed and power:

ANT+ powermeters
currently supported (as successfully tested) are:

PowerTap hub
(records speed so additional sensor is not needed)

PowerTap P1 pedals




ANT+ speed sensors
currently supported are:

CycleOps speed sensor

Garmin speed sensor

Wahoo speed sensor

Avoid any magnetless speed sensor, their accuracy is not as good.

Read the help to quickly see how to use the app:


Current features:

-Classic lap mode (default, click each lap) where it is possible to:

-Measure Crr on ridden laps at slow speed ( 25km/h)

-Model uses air density accurately computed with weather station data and detected sensors

-Configurable field to switch between different fields (altitude, cadence, bike direction,...)

-Several CSV files are stored and can be sent by mail for post analysis

-Possible to hear/record voice message each lap

-Possible to activate cloud storage to list/edit previous runs later

-Possible to plot virtual vs real elevation (barometer needed)

-Averaging power on a lap or smoothing it over a duration

-Measure road vibration with phone accelerometer if available

-ANT+ devices Id are stored and searched preferably

-Record also cadence and heart rate from Ant+ sensors

-Wind forecast on location where you plan to field test

-Possible to enable/disable auto-zero feature of the powermeter

The app detects also:

-data drops (ANT+ events not received) or weird speed spikes

-zero cadence from a crank based PM

-ANT+ sensor battery status

This version is free, but additional features are possible by switching to the
premium version

Premium features:

It includes other modes (described

-Defined lap length mode (for velodrome, click once to start the run)

-Automatic segment mode (needs barometer) to record apparent CdA during a ride (given periodically with 2 digits) which starts each time the minimal speed is reached

-Time trial mode (needs barometer) to compute CdA, power, speed and other average values at the end of a time trial race

And some optional devices:

Weather Meter
anemometer to record air speed (to get a higher precision on CdA figures during rides with automatic segment mode)

Garmin tempe
sensor to record local temperature (higher accuracy on air density calculation)

-Possible to use
Bluetooth headset
to hear/record voice messages (very useful during velodrome testing)

Download the key for the premium version

Known bugs:


CdaCrr - Bike computer with aerodynamic drag is a free software application from the Health & Nutrition subcategory, part of the Home & Hobby category. The app is currently available in English and it was last updated on 2018-01-21. The program can be installed on Android.

CdaCrr - Bike computer with aerodynamic drag (version 2.2.3) is available for download from our website. Just click the green Download button above to start. Until now the program was downloaded 1 times. We already checked that the download link to be safe, however for your own protection we recommend that you scan the downloaded software with your antivirus.

Program Details


Publisher bugno
Released Date 2018-01-21
Languages English


Category Home & Hobby
Subcategory Health & Nutrition

System requirements

Operating systems android

Download information

File size
Total downloads 1


License model Free
Price N/A

Version History

Here you can find the changelog of CdaCrr - Bike computer with aerodynamic drag since it was posted on our website on 2016-10-08. The latest version is 2.2.3 and it was updated on on 2018-03-28. See below the changes in each version:

version 2.2.3

posted on 2018-01-21

(2018/01/21) 2.2.3:
-Fixes again

version 1.4.5

posted on 2016-08-02

New in 1.4.5:,-(beta) Time trial mode: CdA between auto-start and a click at the finish line,-Fix crash for Android 6.0 when activating GPS,1.4.4:,-Wrong CdA when selecting "automatic segment mode" from main screen,1.4.3:,-Crash fixed after Powermeter detection,-Configurable fields (long click) indicated by a *,-Smooth/average option on power field,-Switching mode possible from main screen,-GPS may be activated in the settings,-iBike.csv file added to store more infos,-Road vibration measured

Add a review

Tell us your experience with CdaCrr - Bike computer with aerodynamic drag 2.2.3

Our Recommendations


Click stars to rate this APP!

Users Rating:  
  5.0/5     1
Editor Rating:  
Downloads last week: 0
Release Date: 2018-01-21
Publisher: bugno
Operating System: android
Type: Free