Strava vs Garmin discrepancies?

I have never had accuracy issues with my two android phones I've used. In fact they are much more accurate than other devices other people use. I almost never get an early finish to a segment.

I once flagged a guy who took a segment off me for bad GPS. He messaged me to ask why. I pointed out that his trace floated around a corner through a building and had 2/3 seconds short at each end of the segment. He hadn't beaten me and been given 4 or 5 seconds by his low refresh rate. He insisted Garmins were accurate and scoffed at the idea the a phone was better. I pointed out he had about 13 data points to my over 50 points. He blocked me after that and started to try to knock off my other segments with mixed results, I still have the offending climb in my pocket.

It really just depends on the device, newer should be better, but that is no guarantee.

Quick question.....is the Garmin solo or hooked up to speed and or other sensors?....as Sensors are more accurate than gps for speed ... I use sensors with both my Bryton units....and both the records on Bryton active & Strava are identical for me.....

At the end of a long ride once I did a couple of loops of the caravan park where I was finishing to get the total distance on the Garmin to reach 100 miles. When I uploaded to Strava, it was 99.99 miles.

Strava's help pages are quite useful. See this one to start with then follow some of the links on the left: https://support.strava.com/hc/en-us/articles/115001188684-Moving-Time-Sp...

Zoom in on the Strava map where you did your highest speed... odds are there is an error there, you will see your course deviate from the road, so it thinks you got between two points quicker than you did.  Do the same with the Garmin map and see if that is a difference.

GPS will give errors in speed and distance (one of my loops is less far if I do the course in the opposite direction)

Get yourself a wheel speed sensor if you want the real data.

I believe Garmin/Strava use different methods for calculating speed, and wont always agree on the same answers, theres often a  0.1mile difference in their distance calculations, but if you get the garmin speed & cadence sensors, that provides more accurate speed data and I believe Strava just then takes that speed data as an input, rather than calculating it

Strava on your phone/watch and every GPS unit on the planet use different algorithms to calculate speed/average speed and so on - they more or less match up but there is normally a small difference especially on stop/start rides where auto pause is calculated differently. The GPS hardware inside will also give different results for the software to play with.

Not saying you are as you just asked a simple question BUT DON'T BECOME ONE OF THOSE STRAVA BORES WHO POSTS UP A PIC OF THEIR GARMIN SCREEN WITH 0.1MPH FASTER SPEED BECAUSE YOU WERE ROBBED AND WERE MUCH FASTER OH THE INJUSTICE!!!!

Yeah, every club has one

I too am an owner of a Garmin 830, although I'd never describe myself as anything other than a pissed off owner 😁
I notice differences between Garmin and Strava. Mainly Distance and Elevation Gain, I've not really checked the Speed.
Some people on the Garmin forum think the problem is the Sony GPS chip inside the Garmin isn't very good.
If you ever update the firmware on the 830, I'd recommend doing a factory reset afterwards. It can fix certain issues than cross over from one update to the next.