I feel dumb asking but... Here goes...

I don't know what to do about my flat bugaboo frog tire (one of the back wheels).

I bought it used and it was working fine for 1.5 years.. Then I started to have to pump the left tire pretty often and now I'm pretty sure it has a rip or puncture or something.

Should I try fixing it?? How?

Do I take it somewhere??

What's the diff between inner tube and the tire itself?

Or should I replace the wheel?? Or just the inner tubes? I'm so lost.

My hubby says I should just get two new back wheels but I'm so confused at where to buy and which wheels are compatible blah blah blah.

Anyone have experience? Surely more than I do, ha ha...