Mass produced cheap bikes

In London, where it's flat, and with the trendy-types. But then again, they've got the money, and if it wasn't expensive I'd doubt they'd do it.

Cynical? Maybe.

It's often quite difficult to know what these kinds of ambiguously structured sentences are attempting to say.

Are you saying that the 'London trendy types' only ride fixed wheel or single speed bikes because these bikes are expensive ?