Is it a problem to have tires of different width? I received a new tire for my bike. I believe this is a "Hybrid bike" in English and looks more or less like that


image courtesy of Wikimedia

I use it to commute, 50% on bike paths and 50% on easy forest tracks. I have a normal pace (say, 15 to 20 km/h) without any special acrobatic maneuvers.

The problem is that this tire, mounted on the front, is thinner than the one on the back (significantly, I would say it is at about 2/3 of the width, leaning towards 1/2). The size of the tires are:


front: 28x1.4 (ETRTO 37-622)
back: 622 (28x1.60-700x40C)


Sorry for the difference, one is from a photo of my tire, the other one is from the command details. I can have a look at the tires tomorrow if the measurements above are not sufficient.

Is this an issue? Specifically: can this be dangerous? As I mentioned, I drive carefully but some unexpected moves (hard break, sudden change of direction) are always possible and these are these I fear most.

I mostly know the consequences of having a narrow tire vs. a wide one - I am happy with both widths and their features. The question is about having two that are different.

I already carefully did ~50 km and did not see anything special in the way the bike behaves, but the problem may be in some specific situations (wildly guessing)
37mm / 1.4" vs 40mm / 1.6" is not a very big difference. There should be no problem for casual riding. 

I'd keep the larger tire on the back as the rear wheel supports more rider weight.