Tyre pressures and Pumps
8.5 or 9bar is a usual maximum recommended pressure for road bike tires (23mm width). Depending on your weight and demands on comfort something between 7 and 8.5bar is usually right. Just be aware that road bike tires lose pressure pretty fast so you have to refill them every week or so.

They should feel very hard at 8bar. If you can pinch them it’s way too little (though it’s hard to gauge pressure by hand).