Caporegime
I didn't realise Halfords made chains and cassettes
They do sell lubricants and cleaners and other maintenance gear, though.
I didn't realise Halfords made chains and cassettes
Yes 20" should be fine for your height. It's best to sit on them but I know you can't always do that.
It depends on the "good" condition - has it been looked after? Does anything need replacing? (hope for an honest seller) It's a steel framed bike so it will be heavy as hell, but some people like steel tanks. Also has gripshift gears and some people don't like that (I don't but some do).
It's a fat heavy bike, 14.5kg from a website I can't seem to find again and this alone is putting me off.