Hey I'm back for another autumn of cycling to work.

As many of you know, I have a Trek FX that is going on 3 years old. Last fall, I had to get a new rear wheel because it was rubbing against the brake pads. It was quite loose.

This year, it's doing the exact same thing.

Should I bring it in to the mechanic, or is there a DIY fix that someone can suggest? DIY would definitely fit the budget.

Thanks!