before i crashed there was a small problem shifting, there was noises like the chain was rubbing onto the next gear when i got it "fixed" by the guy that said what i have is not compatible it was fine, so i thought ok and left

then i crashed then it got worse i landed on the derailleur side and i there is a huge patch of paint missing i think i slid at least 10 meters on one side of the bike

*so i may have a slightly broken derailleur**********? *

now the cassette is completely brand new as is the chain and after about 20 miles the gears started to stop changing smoothly again which i thought was weird,

so i tried to fix it again and i got everything to run smoothly just now it wont change into the big gear at the back, as i fix one thing another thing breaks so i just stopped trying ( i dont even need the big gear at the back anyway )