I ordered this because I own a Panasonic electric bicycle. It came with a super short seat post, so I had to buy a long seat post. (I'm 6 foot 2 inches tall (about 185cm) ) the problem was that it wasn't wide enough, so I bought this extender. with this extender it became too wide, so i just bought another long seat post that fit my bicycle. The product is good, but be careful of what size you buy.