I will agree that CrMO preforms poorly under a plastic base. Its WAY to bendy, and will fatigue quickly. Aluminum is stiffer and will stay stiffer under a plastic base. Although aluminum fatigues much much easier then steel with the type of force a carbon fiber base puts on it.
The 07 Kh post snap like match sticks, even the “reinforced” ones. When riding street I only ever got a few weeks out of them before they broke and I had to turn back to my trusty cromo post. I have had my cromo post over a year and a half now, it broke, I re-welded it, its still going strong though.
You people saying alu post are stronger than cromo ones are just weird and stupid :p. Aluminium is a soft material, cromo is easily stronger.
I’m saying the difference between the two is insignificant and highly exagerated. They last about the same for me. Sometimes alu lasts longer, sometimes crmo.
But now I’m hoping the 08 kh post won’t break at all
Today I found something terribly wrong. The forged piece that slides over the post itself has recently started wiggling on the post a bit. I’m afraid it will break off completely soon.
The new post has a 1-pieced forged top plate with a sleeve. The post part presses up into the sleeve and is welded on the top side (the side against the base of the saddle). The weld is required to resist twisting inside the sleeve, but unlike the old post it is not needed to resist front-and-back breakage. I haven’t seen it yet, but that sounds like a warranty replacement to me (e.g. a faulty weld). Pele- let me know when it breaks.
But it didn’t break were I thought it was broken. Instead of the sleeve coming off of the post (which is what I was SURE the problem was), the forged piece broke were the old welded ones usually break (except it broke COMPLETELY off, instead of just one side).
Luckily I got my 07 post until I get a replacement 08!
did the weld at the top of the plate not penatrate the seat post ?
to me it looks like the post was pressed into the base and welded but not very well.