Can't Change Speed Sensor Manual Wheel Size

This is a bug that was introduced in the 5.30 release. You can either set the wheel size to automatic and let the Edge calculate a value (assuming it will let you do that), rollback the software to release 5.20 or wait for the next release.

2096 is based on a 700 x 23C road tire.

Thank you. The Garmin calculated wheel size is off, and shortchanges my distance. How do I roll back to 5.20? If you can point me to instructions, I'd appreciate it.

You can rollback quite easily, but you need to beware that GCM and GE will push the 5.30 update down to your device. Once you have set the wheel size you could upgrade to 5.30.

Download this file to the Garmin folder on the Edge and rename it to gupdate.gcd. http://gawisp.com/perry/edge/Edge520_520.gcd

I would backup the contents of the following folders before doing this as it may clear those when going back a version
Garmin\Settings
Garmin\Locations
Garmin\Sports

After the update place the files you backed up in the Garmin\NewFiles folder and the Edge will restore them.

Luckily my Edge did the update to version 5.30 after my race on the weekend. Otherwise I would have been screwed. I wished there was a way to turn off automatic update.

After the update place the files you backed up in the Garmin\NewFiles folder and the Edge will restore them.

After rolling back to 5.20, all my personal records on the Edge are gone. I backed up all the suggested files and placed them in Garmin\NewFiles after the update.

Your PRs should be stored in GC. You should be able to push them from GC to the Edge.

Can't Change Speed Sensor Manual Wheel Size

I would have to agree with that, but the speed sensor overrides the GPS when connected.

Luckily my Edge did the update to version 5.30 after my race on the weekend. Otherwise I would have been screwed. I wished there was a way to turn off automatic update.

Thank you Aweatherall for the instructions. Downgrading solved my problem.

I (accidentally) found a way to prevent the Garmin from updating. I put a 91gm map file on it, so that it has 12gb remaining. When Garmin Express tries to update, it fails, saying, "The Latest software does not fit on your device's internal memory." No more automatic update!

Your PRs should be stored in GC. You should be able to push them from GC to the Edge.

Tried to push my PRs from GC, but it also pushed down Firmware 5.30, so I had to roll back to 5.20 again :( I guess I will need to wait until the next firmware update.

Sorry I should have added
Garmin\Records to me earlier list.