Is it me or do the front wheels look like 30 by 3 1/2?
The perspective makes the front tires look bigger but the front spokes look longer than the rear spokes like a 30 x 3 would. Too me anyhow.
To me the rears looks fatter. The fronts were closer to the camera, that may cause them to appear larger - and the rim diameter was larger. Looks like a '16 - and it seems like they got tires with the thread rubber mixed with coal powder just like the '17-'23:s or thereabouts. But while the '17:s had smooth tires on the front wheels only, this '16 looks like it had smooth rears too.
Makes one wonder what uncle Fred was up to in 1916?
Sure is dull paint.
Given the dull paint and uncle Fred's clothing, which I would guess is a later style than 1916, perhaps he didn't buy the car new and/or this photo was taken some time after he purchased it. The notation, "Uncle Fred's first car" doesn't say "new", perhaps another indication it was not new.
Pure guesswork, but interesting.