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@PhilDAS
I've got a Cannondale System Six, all online resources tell me it should have either a 27.2 or 31.6 seatpost, but it doesn't. The guy I bought it from tried to sell me a 30.9 seatpost with it and I've seen a couple of forum posts mentioning 30.8 and 30.9 but nothing else. Cannondale haven't responded to my asking.
I don't want to splash out on the wrong size, anyone got one I can give a go at fitting? Either or both sizes