Just test without opening the valve either by pinching the tire with your hand or by putting your weight on it to see the deformation. Do this after topping up to get a baseline and once you think you lost pressure.
If it actually loses pressure you can find out where exactly the problem is, by taking the tire out, filling up your sink, pressurizing the tire (not as much as normally, as it is not confined), holding it under water and looking for bubbles.
That is not normal at all. You should get them checked out.
Nah shouldn't lose air over a couple days as everyone else has said.
Fill a spray bottle with soapy water and spray around the valve stem and bead (where the tyre meets the rim) look for bubbles.
Or check it then don't check for a week and check again and see if it's a bigger lose.
You will feel low pressure tyres when riding especially in corners.
I don't use my bike that much but it does not loose that much air.
Is it because you're checking every day and letting out a little each time?
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