On fit: a way of fitting on the go is to place the fingertips on the bottom bracket axle, and extend the seatpost until the saddle contacts the armpit. If the bike is too small, the usually short seatpost of vintage bikes run out. In the same vein, the handlebar to tip-of-the-saddle distance is roughly the same as from the elbow to the tips of the fingers.
Components: Worn brake pads are a fixable concern that can hinder testing.