Hi all, Well i recently got my first bike of Ebay and it was fine at first however no there are 2 problems which are preventing me from riding , I was wondering if anyone knows the solution. First problem is with my bikes chain, when i pedal it works fine then all of a sudden it will stick, locking up when this happens it also makes my back wheel feel very heavy. I have looked at my chain and it seems to be in working order. My second problem is with my rear brakes I am running Magura's rim brakes and they don't seem to be pushing out as they should, they don't extend, I cannot see any leaking etc. So they are my 2 problems, sorry for the lack of technical languages as im new to biking so don't know all the part names yet etc Thanks for any help anyone can offer.