My used Roubaix came with a non-stock seatpost with no setback so with the seat as far back as possible, I'm not quite able to get to KOPS so looking for something that will allow me some room to try varying positions. Ideally, I'd like something with 25mm setback, which is about the most I've seen.

Also would like something that is fairly easy to adjust the seat angle. The one I have now is a PITA, where it changes as you tighten it so you have to adjust over and over again before you get it where you want after it's tight. The roads I ride on are pretty bad so if it can help absorb some bumps, all the better.

Considering it's a Carbon bike, I'd prefer Carbon but it's not a requirement. Hoping to keep it around 100 bucks but will spend more if it's worth it.

All suggestions welcome.

I'm sort of in the same situation as you. Just ordered a Forte carbon seatpost with 25mm setback from Performance for $70. Hoping it works fine and is reliable.

The material matters here. Carbon, Alloy and Ti, as well of course the shape and how far they extend affect the ride a lot.
You can also cut a lot of weight here for not a pile of money. More in the $1/g range which is less expensive than many other parts.

If you want stiffer - go alloy.

Can you find a Roubaix seatpost?

I don't think any have a better adjustment mechanism than Thomson. There may be some weight penalty for alloy, however. https://www.bikethomson.com/product-category/seatposts/

Workswell, the Chinese frame maker, makes a really nice one that comes with their 066 frame. Weighs about 190g or less. 2-bolt adjustment, so it is really easy to get it just right. I bought an extra one for another bike a few months ago. IIRC, it was $57 delivered. Plain black. Very attractive.

Actually I have a Masterpiece I am trying to unload. Weighs in around 157g IIRC. You can hardly beat that without going very esoteric.

Among the lightest posts you can get are alloy. This is not a recommendation as there is no offset.

If money is not so much a factor the ExtraLite UltraPost:
31.6 x 350 mm 136 grams
31.6 x 390 mm 155 grams

https://fairwheelbikes.com/extralite...post-seatpost/

Those do lighten your bike. Trouble is how much they also lighten your wallet.

ive been considering Ritchie, Easton, and others. You could consider LBS, amazon, and universalcycles.com, amongst others.

Fizik R1 has a nice clamp mechanism once you've figured it out. Not sure you'll find it as low as $100. Wiggle has some size options at about $117

That is why I didn't suggest up front, but when you get into the $150+ range anyway...

Seat, post are some of the least expensive ways to lighten a bike.

Yep, but I am letting my Masterpiece go very reasonably.

My son txted me a picture of a seatpost he bought 30 min ago. A Ritchey Carbon (we like Ritchey a lot). First I asked how much, then I asked if he bought it. He said yes. So I didn't tell him he paid too much.

Is it a 27.2mm with setback?

One plus of the Thompsons is the 2-bolt clamp. Makes dialing in seat position easy and very doable on the road. Not only easy to adjust, but child's play to keep track of what you did so you can undo it if you don't like it. The two screws both tighten the clamp and are used to adjust the seat tilt. Want the nose a touch lower? Back off the more accessible screw a bunch. Adjust the other screw say 1/8 of a turn. Tighten the first. Thompson is not the only 2 bolt post but their clamp is one of the best ever. They sell the clamp so a framebuilder with machining skills can make a post of any setback using their clamp. (I have two TiCycles 60mm setback posts.)

In my racing days I used to do this to get myself off saddle sores. Ride that way for a week or so until the sore was gone, then undo what I did. Seat would be exactly back where I had it before. Didn't have to measure anything, just remember the number of turns.

To me, this adjust-ability outweighs weight by a lot!

Ben

But the Thompson is also among the lightest of the commonly available posts. And the Workswell I spoke about has a clamp just as good for only $57. I know because I have them both.

I'm turned off by Thomsom seatposts because their dropper post on my MTB pretty much sucked and I got rid of it. So I would not be inclined, now, to consider anything they make for road bike use.

Ritchey Pro Logic.

.
...I use a seatpost, never ride without one. That's my recommendation.

I've ridden without one. It is hard work. (An Avocet post that broke its clamp and dropped the seat 3 miles from my destination. Seat into my jersey pocket. A lot of standing. Shifting (with DTs) was hard and time consuming. I climbed the 150' hill to the finish in a 42-14 because I didn't know it was coming and there was no way to shift once I started up!)

Ben

Syntace P6 Carbon HiFlex review - BikeRadar

Ritchey seat post clamping mechanism is susceptible to wear and slippage. the enve type and Thompson clamps are much more durable. I returned 2 Ritchey seatbelts back to performance for issues with slippage. Seems to be more of a problem with setback seat posts. More torque load with a setback seat post design.

I have had good experiences with an older ca. 2009 Ritchey WCS seatpost and a newer Superlogic post. I had read stories about the older WCS clamps slipping but it was never an issue for me. The Superlogic post has an even nicer clamp (shared with the new WCS posts, too) that let's you set everything exactly where you want it then tighten it all up. Quite light (<150 grams) but not the cheapest option out there.