Trek X01 seatpost

[sbeatonNJ]

Hey quick question! I am planning to build up a 2001 trek x01 and I'd like to gather parts now, so I can get on the road asap. I plan to use it as my road bike (I sold my road bike to get a tri bike), to commute, and to race cross in the winter. Can someone tell me what size seatpost I need? I looked online and could not find it and I emailed the person selling the frame on ebay but he didnt not respond. Thanks in advance for your help!

[just du it]

All of the Trek XO-1 models have 27.2mm seatposts.

[sbeatonNJ]

Thank you!

Just wanted to add thanks again for giving me the seatpost size. I won the auction and the owner is including the seatpost. Can't wait to build that thing up. Ive been spending many hours in my aerobars in prep for a half iron, it will be nice to have a road bike again. Plus I have always wanted a cross bike.