Got my New USE Aien Carbon MTB a couple of days ago !
This is the new MTB specific USE Carbon Post with thicker walls and no need for a shim.
Straight on the scales!.........31.6mm/350mm = 198g.
And now for the question:
The minimum insertion mark on the post is 99mm from the base of the post.
But I would like to run it only inserting 85mm into the frame.
(leaving the minimum insertion mark 14mm outside the frame)
This 85mm insertion covers the 2.5 x diameter of post inserted into frame rule. (2 x 31.6mm = 79mm)
At 85mm insertion the post also goes past the base of the top tube by 22mm (almost 1 inch)
see illustration below
I shall also be smoothing the edges of the frame/seatpost clamp where the post is inserted and reversing the seat clamp 180Â° away from the frame split to a aviod stress riser.
Now bearing in mind I ride this bike only on the tarmac streets of London and never off road (the most action it might see would be bunny hoping over a man hole) and I weigh around 11 stone (150 lbs) do you think this much post inserted into the frame should be all right?
I know there have been stories of the 1st generation Alien Carbons snapping, but I believe this was sorted out by the second generation design, and this one is the new even thicker third generation MTB specific design. Or is a reduced insertion length more of a threat to your frame?
Any input greatly appreciated.
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Thread: --------Safety Question--------