freeranger

You'd think by now I'd have it dialed in. But the last ride felt like it was trying to move me forward. The seatpost is a one bolt adjust, with serrations on the cradle. So I marked both parts with a marker so could tell how much, or if, I had moved by looking at the two sides of the marker. Only moved it one serration (and they aren't large serrations), but just took it up the street and back and it feels more "neutral" now. Maybe the saddle rails "bedded in". I'm on the thin side-have the opposite problem of most-can't gain weight--so haven't gained any padding back there, so had to be a saddle adjustment. Just when ya think you've got it set...............

Iride01 

You say you are sliding forward while riding? For me that usually would mean there is too much reach to the bars or simply too much tilt. It's one of the reasons I have my saddle further forward when everyone else is trying to push theirs as far back as it will go.

I used to ride with a little nose down. Some like it nose slightly up. But for a while now, I've had my saddle pretty much level.

I don't like those one bolt posts. I like the posts with two bolts that serve to both clamp the saddle and change the tilt. They can be a little harder to deal with mounting the saddle, but I'm willing to cuss a little just so I can have infinite tilt positions.

79pmooney

I'll second the 2-bolt seatposts. HTey make dialing in the tilt and back ad forth position so much easier, And you can do tiny adjusts and go back exactly. (I back off the rear bolt a bunch, then either slide the seat for fore and aft or tweak the forward bolt (say) 1/4 turn to lower the nose. Tighten the rear and ride.

Good seatposts are the Nittos and the Thompsons but there are others too, (And a weirdo that had bolts on both sides. All the disadvantages of each system and none of the advantages of either. I'm still scratching my head.) I have a NItto and two customs built the Thompson clamps.

GeneO 

There is one-bolt and there is one-bolt. I have a specialized one bolt and it is simple to adjust the tilt and clamp the saddle as well as adjust fore-aft.

But yeah, one is always adjusting because it depends on your current fitness as well as generally being an adjustment where small changes can make a big difference, partially because changing the height also changes the reach,

Road Fan

Yep!