cant role shifter rolls up and crashes into cogs.
hey im new to this mountain bike thing i normallly ride bmx but bmx was getting borring so i went out and got my self a Kona "shred" but recently (ive only had it since the 12 of jan) the rear cog with all the gear teeth (not sure wat its called on a mountain bike) it spins with the wheel when i role if i dont pedal the derailer rolls up and smacks into the cogs on the rear tyre is this easily fixed? i think its just the rear hub needs ajusting but im not a real wiz with bike mechanics help would be apreciated.