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You will need to measure both of those things. There is no one size. Though there are some common sizes depending on your frame material
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also, some posts are oval internally - thomson for example
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I want to put a seatpost inside a seatpost to make an extension.
I would advise against it, but if you must go down the telescope route just buy some plain tube with the desired dimensions.
31.8 is not a common size, are you sure you don't mean 31.6?
PhilDAS
bigshape
gbj_tester
@sacredhart
I want to put a seatpost inside a seatpost to make an extension.
What size clamp for my frame do I need for a 31.8 seatpost?
What size seatpost will fit inside a 31.8 seatpost?
Thanks