So ive been riding lately and when i stand up and pedal hard i notice some noises come from the gears, its kinda like a noise you would expect to hear if the chain was slipping on the gears...anyone know what im talking about?

Also on my brakes (Yeah tektro disks!) i hear alittle bit of rubbing when i turn or lean the that normal???

All-in-all though im really happy with the bike, its on 05 ironhorse warrior sport- i picked it up for under $300. I have been thinking about upgrading some components- but idk what to go for first, handlebars or stem maybe? theres something a little goofy about that when im riding that i dont like about the position.