I don't know much about bikes at all. I have this bike which I was ideally going to use tomorrow for an journey but I think that I may have to use other transport now. I haven't used it in a while, and I know it had issues in the past with the chain slipping when trying to change gears.
I read online about how to fix this and then I noticed that the front tyre looked flat, so I inflated it, but when I rode on it to test it, the tyre makes this loud rubbery sound, I have no idea why. Its a mountain bike and I read that it was supposed to have about 1cm give when squeezing and it feels right. But this sound makes me think that something is really wrong. I have recorded how it sounds in this video. Please help. Is the tire broken? I have a photo attached too. Thank you.