I'm fairly new to the cycling community and need a little help from you more experienced cyclists. When I first bought my bike, I noticed after the first couple of days that both front and back tubes had really slow leaks. For the first few months, I thought it was just from the everyday riding that was causing the loss of air. But after a 2 months, I decided to just try adding a little slime to both tubes. This worked perfectly and I never had to put air in the tires again.

A few months after sliming the tubes, I bought new rims which came with new tires and tubes. After airing them up to the recommended p.s.i., I noticed a slow leak in the rear tire. This is the second set of new tires and tubes that I've had with a slow leak from the very time I've started riding on them.

Is this normal? I would just slime the new tubes but they have presta valves where as my original tubes had schrader valves. I haven't found a way to slime a presta valve without removing the stem. That's not something I want to do.

I have several questions.

Is it normal to experience slow leaks in new tubes and tires?

What is the best way to fix this issue when you have presta valves?

Can my local bike shop slime my tubes for me?

Thanks in advance for your help fellas?