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Makes sense to try them on the commute first, then a couple of local rides to get confident in them.
Yeah, that's what I do with any component changes.
I ride flat pedals on my fixed pub bike already. I just won't be able to kick the pedals around as nicely with a freewheel.
I guess the pressure distribution will depend on what shoes I end up using. I've looked online at a bunch and still don't really have anything I like the look of.
Makes sense to try them on the commute first, then a couple of local rides to get confident in them. But, TBH, I've never had any problems chainging between them and speedplays from ride to ride. Position is the same, just feels a bit different to begin with. Much nicer for climbing out of the saddle than speedplays - really feel like you are pushing with your whole foot, which you are!
I was using them this weekend on my loaded tourer which has 10-y.o. Tiagra shifters +M triple, so not quite as slick as Di2. And my foot slipped a bit when I shifted heavily a few times. It never slipped off the pedal but a little bit forward, out of position. It might be that it is Di2 that makes these a feasible alternative to being clipped.