Coupe vs Roadster - chassis stiffness

[TomK]

eta: hence one of the reasons why the roadster M has slightly softer damping than the M coupe. It's common for cabriolets to follow this rule, in order as you say to give the chassis an easier time as it were.

I'm wondering if BMW choose slightly softer damping for the Roadster from a marketing pov, perhaps assuming that more hard core driver would choose the Coupe whilst the sun loving open top driver might appreciate a slightly softer ride? Rather than any sort of chassis dynamic reason?

Yes perhaps you're right, that would explain why they gave the coupe a quicker steering rack also.
I do stand by the comment though that in general cabriolets will have relatively softer spring rates etc to try an minimise scuttle shake?

 

[Fishy Dave]

Yes, totally in agreement with the last sentence