I would change the clamp and see if a new one has the same problem or test with another saddle. I have owned a P5 and sold many and never had any issue. You might just got unlucky and the clamp is just not 100% good.

Jeroen

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Owner at TRIPRO, The Netherlands

I have had that clamp on multiple P3's.

The solution is the location of where you put the clamp relative to the nose. What you want to do is move the clamp on the seat post as far forward as possible and move the saddle back in the clamp as far backward as possible so that the location of the saddle in space relative to the bottom bracket is the same, but the lever arm from the centre bolt of the clamp to the nose of the saddle is as short as possible. If the clamp is far to the rear of the saddle relative to the nose, then there were will more torque when you are riding the nose causing the saddle to tip downward. The other solution of course is "get lighter", because Torque = Force x distance and Force = mass x9.8m/s^^2. If you reduce your mass you reduce the torque on the bolt holding the clamp in pace.....much easier to change the "distance" than the "mass" in those equations.

To simplify this, if you you have 14cm of distance from midde of bolt to nose of saddle, and if you move clamp on seatpost forward by say 2.8cm, and then move the saddle inside clamp back 2.8cm, then you will be in the same place in space relative to the bottom bracket and you will have 20 percent less torque at the bolt which may be just enough to keep it from tilting on your rides.