Tried fitting the Darimo seatpost in the X68 frame and noticed the seat tube is just a tiny bit wider more play side to side.
I could get the X68 post—probably an inch diameter—into the SL8 frame, but that’s it. .
The Darimo post fits the SL8 nicely and snugly. But the X68 post, if you don’t hold it tightly, will just slide right into the framem. I wouldn’t buy a genuine SL8 post because the Darimo one felt a bit loose in the X68 frame.
For the X69 seatpost hardware weight:
• Carbon cradle: 12g
• Saddle yokes/clamps x2 No: 10g
• Two M5 Ti bolts (30 and 35mm): approx 4g
• Original barrel nut: 1g
Total: 27g
So overall, the seatpost weighs about 131.9g. I’m thinking of cutting the post down to 350mm and re-drilling the Di2 battery holes as well.
One more thing—the original rear bolt is M4 size for the seatpost clamp hole at the rear but an M5 bolt will thread through the back hole in the seatpost without issue.