I had the same problem. Then I tried a Road Bike Profile from my Edge 1030 and now it works fine. :-)

You can download the working Profile from her:

https://1drv.ms/u/s!ACKDXcZD8LXBguYX

Put it in the folder new Files. The name is german. You can rename the File bevor copy.

Hey, I hacked up my 935's default cycling profile to change it road cycling (sport type = 2, subtype = 7). Tested it on my 935 and it works.

Should work for 935, can't say anything about other watches.

EDIT: Try this at your own risk. I can't guarantee that this will work or that it won't mess up your activity list in strange ways.

935 Road Cycling Profile: 99ROADB.zip

1) Unzip file to obtain 99ROADB.FIT

2) Connect watch to PC/Mac with cable. (If you're trying this with a music-enabled watch like Fenix 6 Pro, and you're on Mac, you need Android File Transfer.)

3) Copy FIT file to \GARMIN\NEWFILES

4) Eject watch

You'll now have an "Road Bike" profile that can be renamed to anything you want. On Garmin Connect, this shows up as "Road Cycling" for me (my language is English), for both the activity title and the activity type.

If anyone else has this problem and the attached FIT file doesn't work for them, let me know and I can either give instructions on making a profile yourself, or modify your profile myself if you can post it here.

EDIT: Modified link so it points to new FIT file whose profile name is "Road Bike" instead of "RBke', so you don't have to edit it yourself.

Sure, no worries!

You will need a PC, Mac or Linux computer, and you'll need to download a few tools. You'll also need something that opens CSV files, like Excel or Numbers.

EDIT: Note that I am editing this post incrementally, because the forum won't let me post the whole thing at once (usual forum errors with complex text and/or code).

Note to Garmin: These forums are terribad.

EDIT: Finally finished this post, after about 100 edits.

EDIT: Try this at your own risk. I can't guarantee that this will work or that it won't mess up your activity list in strange ways.

Tools

Java:

- Windows: https://adoptopenjdk.net/

- Mac: Should already be installed

FIT SDK: developer.garmin.com/.../

Hex Editor:

- Windows: https://www.hhdsoftware.com/free-hex-editor

- Mac: https://hexfiend.com/

- You can also use the Hex Editor extension for Visual Studio Code, but I find it to be a bit basic

Beyond Compare (optional): www.scootersoftware.com/

- You can also use the file compare functionality in Visual Studio Code, but I also find it to be basic. (The main downside of Beyond Compare is that it doesn't look great)

Scripts

I created a script you will need to help calculate the "CRC16 checksum" of a FIT file, which is an important step to finalize the file after editing it.

Windows: fitcrc-win.zip

Mac/Linux: fitcrc-mac.zip

Setup

1) If you're doing this with a Mac and a music-enabled watch, you need Android File Transfer.

2) Unzip the FIT SDK to a folder on your hard drive. I recommend moving the FIT SDK directory to the top level of your user profile, and renaming it to something short, like fitsdk.

e.g. If you unzip the FIT SDK archive in your Downloads folder, it will create a folder with a name like FitSDKRelease_21.47.00. I recommend changing this to fitsdk. For simplicity, I will also recommend placing any FIT files in the java sub-folder of the FIT SDK.

3) Unzip fitcrc-win.zip or fitcrc-mac.zip to your fitsdk/java folder.

Additional step for Mac only:

• In terminal:

cd ~/fitsdk/java
chmod ogu+x fitcrc*

Notes and Definitions

Decimal

"Decimal" refers to the standard (base-10) representation of numbers using the digits 0 to 9: e.g. 1 dozen = 12.

Hexadecimal

"Hexadecimal" (hex) is a base-16 representation of numbers using 0 to 9 and A to F (case insensitive), which is convenient for computer science. e.g. 1 dozen = B. Sometimes you will see hex written with a "0x" prefix - e.g. 0x0B.

Byte

An underlying form of representing data in computers. This is a number from 0 to 255 (decimal). In hexadecimal, this is a number from 0 to FF and can always be represented with exactly two hex digits and vice versa (hence the usefulness of hex). A hex editor displays a file as a series of bytes.

Converting decimal to hexadecimal

This can be done using the calculator in Windows or Mac. or in Google. e.g. if you search "16 in hex", google will respond "0x10"

Editing Procedure

1) Connect watch to computer with USB cable

2) Navigate to \GARMIN\SPORTS\ on the watch and copy the profile of interest to fitsdk/java on your hard drive. (They will have names like 0RUN.FIT or 1BIKE.FIT.)

3) Convert the FIT file to CSV to take a look at its contents:

Windows

• Open FIT SDK folder in explorer
• Navigate to java folder
• Drag FIT file onto FitToCSV. This will create a CSV with the same name as your FIT file

Mac

• Open terminal
• Type:

java -jar fitcsvtool.jar NAME_OF_FIT_FILE.FIT

Now you can open the CSV file and see all of its information in mostly human readable form.

e.g. For my cycling profile, I can see the sport type is 2 and the sub-type is 0:

4) Next, determine what sport type and subtype you want to change the activity to. (I assume the sport type won't change, since you would've chosen a profile that's close to new profile you want to make)

https://developer.garmin.com/connect-iq/api-docs/Toybox/ActivityRecording.html

From this doc, we can see that the sport type for cycling is 2 and the sub type for road cycling is 7.

5) Make a copy of the FIT file, and open the copy in your hex editor. (The remaining instructions will assume you are working on the copy, not the original)

6) Look at the two bytes starting at position "0dd". They should be 02 00 for cycling. If you open another profile such as mountain biking, the correct sport and subtype should be here, too (02 08 for MTB).

If you're on a different device than 935, and you don't see the type and subtype in the same spot, try correlating the FIT data with other data in the CSV file.

For example, the sport name is "Bike" (on the same line as sport type and subtype), and we can see it's fairly close in the FIT file. Also, the field right before sport type ("unknown") has a value of "61" in my case. 61 (decimal) is equal to 3D in hex, and we can see that the bytes "3D 00" appear right before type and subtype.

It may also help to load several FIT profile files (with known sport type and subtype) and use the above procedure (look in the vicinity of the sport name).

7) Convert the new subtype number from decimal to hexadecimal. e.g. 7 = "07". 11 ="0B"

8) Enter the subtype number in hex at position "0de". For example, if the subtype is 7, enter "07". If the subtype is 11 (cyclocross), enter "0B".

8.5) Change one character of the activity name to make it different than the original. e.g. In this case, change the "e" in "Bike" to "2" (or something), so that the new name is "Bik2".

9) Save the FIT file.

10a) Now we have to fix the "CRC16 checksum" of the FIT file before it will be accepted as a valid FIT file. The checksum is 2 bytes at the end of the file which validate the rest of the contents. In the following example, the two checksum bytes are "97 C2" (in reverse order):

10b) Determine the new checksum

Windows:

• Close hex editor and drag the FIT file onto the fitcrc file. If you don't see any output, drag the FIT file onto the fitcrc-debug file.

Mac:

• In terminal, type:

cd ~/fitsdk/java
./fitcrc.sh NAME_OF_FIT_FILE.FIT

• If you don't see any output, type:

cd ~/fitsdk/java
./fitcrc-debug.sh NAME_OF_FIT_FILE.FIT

You should see output which looks like:

Fit.Decode: Expecting next 2 bytes to be end of file CRC = 0x AB12

In this example, AB12 is your new checksum.

11) Reverse the checksum bytes (groups of 2 digits) from the previous step. For example, if fitcrc's output reads "AB12", your new checksum will be "12 AB". Replace the 2 bytes at the end of FIT file with the new checksum and save the file.

12) Now it's time to test your changes. As in step 3, convert the FIT file to CSV, and ensure that it converts without errors and that your new subtype is in the CSV file.

13) (optional) As a sanity check, use Beyond Compare to compare the two CSV files. The only difference should be the sport subtype.

If you prefer the command line, you can also use "fc" in Windows and "diff" in Mac, although the output is slightly harder to read.

14) Now that you've validated your new FIT file, copy it to \GARMIN\NEWFILES on your watch and eject the watch.