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I always put a little grease on the inside of the seat tube on the bicycle before installing my seatposts. This keeps your seatpost from rusting into the frame. If you live in a humid region your seatpost can rust solidly into your frame in as little as a year.
Always be sure to have the minimum insertion level inside your frame.
The size of your seatpost will usually be etched on your seatpost just below the minimum insertion line on the post.
We have a lot of seatposts available at Zbikenut on eBay.
We also have a lot of XLC Bicycle parts on ebay. XLC is a very large international brand that specializes in good quality parts at excellent prices.
Enjoy the Ride,