Thanks for responsivenes! I looked over once more and couldn't find any other sings just on the brakeing and gear system all over is written SHIMANO... and in begining i thought it is rust on the rims, but when i started to cleen them all the small dots came off easily, so that means that this is steel or wery good chrome? this tube with presta valve... in that sunday market when I bought the bike it had a flat tire, so the man who where replacing it jus took randomly one tube from the box full of tubes and put it on... there was like a bicycle service team at thier stall

there is some more pictures...