Time difference between riders is just wrong

This week I attended an everesting event on Oh Hill No. You start to notice things after a while. The time difference between riders was just incongruent. Some riders that had already lapped me or I had already showed small time differences others a big time difference. Eg in this examples you can see Lovegren and Katrib with supposedly a few seconds behind whereas they were hours behind but Bursic and Hammer correctly a lap behind (other much faster people lapped me too and the same but of course I didn’t screenshot that)

Was it a meetup, or an event? I have seen crazy time gaps in meetups forever, somehow I think it keeps a time gap from where you start on the roadside relative to others and even when you are riding right next to them it will still show you as ahead or behind them. Either way, when laps are involved it can get crazy. Long standing bug.

It happens to me in events. I never do meetups. A few days ago I did a ride where I decided the group was going a bit too fast so I sat up to wait for some people behind. My time gap to the people who rode away remained 0:00 and then I joined a group that was around 1:40 behind me and that time gap remained when they reached me. I was a bit surprised that they were suddenly upon me as the gap appeared so large. I rode along for a while within a few meters of people who were more than 90 seconds behind me on riders nearby, while the group that was long out of sight was showing no time gap to me.

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This seems to have gotten worse in the past few months in events.

I think an event (it’s listed on zwiftpower.com) and I think we all departed together from the pen

Unfortunately the time gap on the riders nearby list being wrong has been an intermittent but persistent problem on Zwift in events for well over a year now. It’s been reported on the he forum in a couple of different threads but I don’t think there was an HQ response or mention of a fix.

I have learned to look at the mini map above on the right and the distance tiles of riders behind me at the bottom of the screen by the power zone graph as both of those tend to be more consistently accurate than the riders nearby time gaps.

Isn’t time gaps using some bonkers method like presuming all riders are travelling at 30mph?

I think so but that would be better than what I observed if it actually worked properly. If I’m 1m away from a rider and they are apparently 1:40 behind me on riders-nearby then it’s broken regardless of how the gap is calculated.

The fun ones are when it shows riders going the other way.

For me it looks like ~30 km/h (19 mph).

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Different issues but shouldn’t time difference be how long ago you where there for riders behind you and long ago riders in front of you were where you are right now….

The gap seems to be oddly related to the meters between. I’ve seen a rider 10 seconds ahead of me go down a steep incline and suddenly be 26 seconds ahead. Then I go down the hill and it’s back to 10 seconds.

Yes that’s caused by the 30k/ph assumption

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