Hi,
I have just received my new Cervelo Soloist but the seatpost is always glinding down. What could be the reason for this ? It really drives me crazy, every ride it goes down a few mm’s ? Please help. Thanks in advance for the feedback.
Call Cervelo CS. They will be able to help you. This is from them.
"To properly install your seat post you need to grease the brass shim on the side that contacts the inside of the seat tube. You did not mention that piece so I don’t know if you have it. If not check to make sure that is has not been shoved down into the seat tube. If so a spoke is a great tool to get it out. If not then a Cervelo dealer should have one or you can get one off cervelo.com;
Make sure that the post and the rest of the seat tube are grease free and tighten the seat post band clamp secure.
As for the creak the above might help. If there is no brass shim it will slip and creak. Also make sure the threads of the seat post heads are lubed and tight. The length of the saddle can create a fair bit of leverage that can rock the rails on the seat head.
I have a brass shim but I don’t know if my bike shop has put some grease on it ? I will check this with them, thanks for the reply
I had the exact same problem, it got so bad that on some rides that it dropped as low as it could go. After going back to my bike shop a few times, with the same issue, this past Friday, they added a second brass shim. This really seems to have helped, I have put on about 110km since then, and it has not slipped 1 mm. BTW, this is with the Aluminum seat post, not the carbon one.
mine came lathered in greese, so after i wiped it down good and dry - it was cool…but i really need to crank on the bolts to get it from moving.
Luckily, I don’t have this problem with my Soloist…but I curious to when bike manufacturers will come up with a better solution to a seat post.
Heck…I wouldn’t have any problem cutting a post if they would allow you to set the height. Or, perhaps put “notches” in the post and make it fixed.
HELP HELP HELP
I have installed a second brass shim, but this still doesn’t work. Every time a ride the bike the saddle goes down !
This needs to be fixed I’m getting nuts on this. I have the impression the seatpost is to small or the frame is to big.
I need to have this fixed very quickly before I get injuries !
PLEASE HELP !
Since I have had my soloist for 5 weeks I could have sworn that my seat had slipped in height on a few rides (including Ironman LP…OK…nice seatpost excuse), but I thought it was just in my head. 4 hours into my 5 hour ride this weekend, I raised it 3 mm or so and it felt like it was back to the original height at the start of the ride. I really need to verify this whole thing by marking the height at the start of the ride with some electrical tape. I’ve had to raise my saddle a few times over the past 5 weeks, but that was mainly a function of playing around with seat position (or so I thought…perhaps it was just the post sinking…)
Did you grease the outside of the shim (between the shim and the post)? You have to really tighten the bolt on the seatpost. This worked for me. What did Cervelo say?
First I forgot to tape it and the saddle went down +/- 6cm on two days 
Now I have taped it 2 mm higher than the post, so I can check it on every ride and it goes down every time. The post it self is already dammeged by this. I need to get this fixed as I need the bike in perfect condition in Kona !
I will have to tape for my next ride and let you know what I find. I’ll also check if the shop installed the shim ! Good luck in Kona…if nothing else you will have a nice built in excuse
If all parts are greased, check the seat post for scratches. Sometimes the weld on the seat tube / chain stay will blow thru a little and scratch the seat post a little. If this happens, get a round, fairly smooth file for metal, and file it smooth. This worked for me. Seatpost hasn’t slipped in years - E
After over a year with no slippage I started to get the same thing happening with my Soloist. I have both the alloy seatpost the bike came with and a carbon one I bought separately, and I swap them between road and tri positions. Both started slipping at the same time.
I tried using the shim with the carbon post as someone from Cervelo suggested and the problem persisted. Then I took matters into my own hands and fashioned an additional shim out of a piece cut from a Coke can. Neither has slipped since.