Originally Posted by
BIKER2000
you mean this ? Shimano Tourney TX35 6/7-speed Rear Derailleur ? it seems to be long cage
is that ok ? and about the chain , a friend here in the forums told me that 6-7 speed chain fits my bike , i have a suntour five cogs freewheel
I should have been more clear. A new chain will often skip on old rear cogs due to the cogs being worn, especially if the small ones were ridden more. That would require a new freewheel (requires a special tool to replace it). Also a special tool is required to install a chain.
After seeing the pic of your bike I would seriously advise you to pitch it and buy a decent used bike. Even completely fixed up that bike is worth $40 or less.