Guys, a question for you.
The RD that came with the bike is a Tourney TY 15 SS. Sorry, it's an arty-farty photo of the I took for the photo challenge, and yes, I know the nut and bolt are on the wrong way round.
Have done a bit of reading up, and as I suspected, I shall have to replace it, as it's only capable of a) 28 teeth max on rear sprockets and b) 6 speed.
Seeings I'm leaning towards 8 speed and 11-30, or maybe (depending on how the maths looks) 11-32, what would be a suitable replacement? There are a load of options, so from my perspective it's a bit of a minefield.
I also need to find a hanger that would work with whatever RD I eventually choose, as the above bolts directly to the dropouts.