I have a Dahon Vitesse D7.. Have lost the seat post. Can you let me know what is the size of the seatpost will fit to the mentioned model

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    You need to measure the place where the post goes. Or better, find a post that fits (even if the wrong style) and measure that. There are too many different post sizes to give a number out of the air. – Daniel R Hicks May 5 '17 at 12:37

Go to a bike shop and get it measured.

They'll have some seatpost measuring tool like this: enter image description here

You basically stick it into the seat tube and it tells you what size seatpost you need.

Alternatively, you could use a vernier caliper to measure the seat tube diameter on the inside (this is key!).

Note that the seat tube diameter is only one dimension; you also need to know what length tube you need. Most seatposts have the same clamp type as well, but you may want to get one with extra fore/aft adjustment or whatever. So, going to a shop and buying one isn't a bad idea if you don't know what you need.

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