I have really enjoyed riding my BK5, but even with two inch wide tyres fully inflated, I have had a very bumpy time trying to avoid small seams in the road where a patch has been put in from repairs with no suspension on the bike. The seat post has been the answer. I am pleased that the new versions already have it fitted. I have also fitted my own saddle for extra comfort. This seat post is slightly thinner than the original and needs a thin sleeve of metal around it to make up the difference, but the spring directly under the saddle gives me, quite a large chap really for the size of the bike, a very comfortable ride. I am saving to buy a bigger bike soon with gears as well, but any suggestions on how to sell this one when I need to?