I bought an Easton EA70 27.2mm seat post off Ebay; well that's what I thought it was. When I placed it in the seat post tube it seemed to slide in somewhat more easily than I expected. The clamp tightened up ok but looking at it later I noticed there wasn't much of a gap left between the ears of the clamp where the screw is. I measured with my calipers and got 27.08mm. I could get 26.8 if I put pressure on the calipers. The genuine seat posts with my other bikes are about an extra .1mm in diameter. I mean it works but is this ok in a carbon fibre frame?