I'm finishing up a build of a new frame, and the steerer is uncut. I don't want to cut it too short and have to resort to a stem that rises to make the cockpit correct.

I think I've got the spacers correct, using another bike that fits well as a measuring guide, but the new frame has a sloping top tube so I'm not certain about the fit until I ride it.

Seems reasonable that I tighten the stem bolts to spec, and then ride it with the steerer uncut to check the fit. Once it's good, then mark it and cut the steerer.

I guess I'm asking if riding it without the plug in place inside the steerer is OK, for just a short while to check the fit.