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Discussion Starter · #1 ·
I'm thinking of building up a Specialized Tarmac SL4 frame w Di2. I was thinking about doing a Thomson stem and seatpost, but Specialized seems pretty adamant that they want you to use their stem and shim system with their steerer tubes.

So, now I'm thinking about seatposts. I see FSA seatposts and Specialized seatposts on eBay for the $50-150 range. As long as it's 27.2, can I use whatever I like? Do I need some sort of fancy shim?
 
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