After a day of riding i was braking and used the hand brake and it started grinding by what seemed like the aux brake. now whenever im at higher speeds it does it occasionally. i adjsuted the rear brake today but it still does it. Any idea to what it is?

 

maybe slack on your carrier bearings? axle could be moving when you apply brakes and the chain isnt lined up correctly?

 

Now that you mention it does kinda sound like the chain. How you think i could fix that?

 

buy a carrier bearing kit for your bike. not real hard to replace. just greasy