Is a seat post with an integrated pump a good idea? I saw this http://www.premiumbikegear.com/biologic/convenience/postpump-seatpost.html and thought it seemed like a cool idea. But if it was really such a great idea, I would have expected to see more people using something like this?

Are there any major shortcomings from integrating a tire pump into the seat post?
A seat post pump would offer a type of convenience that may not be applicable to a wide range of riders.


High-end seat posts are made out of carbon fiber. Even many mid-range aluminum bikes have carbon-fiber seat posts. Using an aluminum seat post pump would negate the benefits of carbon seat posts.
CO2 canister pumps offer more convenience than a seat post pump. People who are looking to spend the most money on gadgets seem to gravitate more towards CO2 canisters than hand pumps.


In the end, a seat post pump probably has the most appeal for commuters, but they might be more interested in buying a cheaper pump than one that saves a bit of weight by being combined with a seat post. There's probably not a fatal flaw with this type of design, but there are reasons that it isn't as common as the basic frame pump.