Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: is this seat post a 26.8mm diameter?
Document: Excellent performance on the road. This seat post smooths my ride. You wouldn't find any better product for the same price of this.
Nice piece for the price -- I'm pleasantly surprised. Lighter than its replacement (albeit, this was on $1K Road Bike). Fit/Finish is excellent and that incessant squeak which I thought came from the seat was actually the original seat post! (Delivery was a day late from Nashbar, but that's not a big deal for me.)
I was very pleased with this seat post. Fit was perfect. The numbered depth increments are ideal and give you instant review of the seat height. I can't claim it smooths bumps. carbon fiber is very strong, light weight and rigid, rapid "shocks" seem to be muted, but this is not scientific but more subjective. It is lighter, looks good. well made and I like the way the bike rides.
The difference between the alloy seatpost from my CX bike and this CF one is like night and day.The only drawback to CF is that you really do not want to over-tighten the binder bolt. Doing so will eventually cause the CF to crack and fail -sooner or later. The torque value on the binder bolt for a CF post is never tighter than you would screw in a lightbulb! REALLY!So in order to make sure your seatpost doesn't move you need to make sure the inside of the seat tube is clean and burr-free.
It must be exactly round and not egged-shaped. I started with a bare frame from my powder coater so I carefully cleaned the inside of the seat tube with a hone and got it mirror-perfect inside. I also made sure the clamp lug was perfectly round and aligned. If the clamp lugs are bent it will not work well, and if there is a sharp portion on the top lip where the seatpost lug ends it may dig in and eventually damage the CF and starting a stress riser. I carefully sanded the inside lip of the opening of my seat tube with a small bit of 400-grit sandpaper so it wouldn't be sharp at this transition -being careful not to take off any paint/finish on the top of the lug -just losing the sharp corner where the inside turns into the top, and this can't even be seen once the post is inserted.Also use some assembly lube:Finish Line Fiber Grip Carbon Assembly G.  This will act as a lubricant to keep the lug tight at low torque values while still adding tiny grit particles to add friction to the collar/seatpost contact point so it won't slip.I also added some anti-seize to the binder bolt threads themselves so there is no doubt that the torque being put into it is going into pinching the lug and seatpost and not drag in the threads making it hard to judge just how much is getting to the area you want.Permatex 80071 Anti-Seize Lubricant with Brush Top Bottle, 4 oz.I did my homework before putting a CF seatpost into a vintage steel frame.
The 531-Reynolds frame is already a smooth performer on the road. There is very little road vibration coming up through it even on the roughest of roads riding on nice 28mm rando tires. But I can still feel a difference between what my hands are feeling through the nice thick cork tape and gloves at my hands and my butt while sitting over this seatpost. The seatpost is dampening out at least half of what is getting to my hands. I simply couldn't believe this at first. I am a convert to CF seatposts and will probably be replacing the 27.2mm post on my Cyclocross bike too with another one of these.
This is my first carbon seatpost. I put it into a vintage Reynolds-531 steel frame that I have recently built up as a brevet bike. I thought I had an extra 27.2mm alloy post laying around to finish out this build but found out that it wasn't actually 27.2 -so I needed to buy a new 27.2 post anyhow.Initially I was looking into high-end alloy posts and saw that this carbon one wasn't really any more expensive so I figured I would give it a try.I am GLAD I did because the ride on this seatpost is simply amazing.
This is the least expensive carbon fiber seatpost I could find. It does feel a little cheap, but it looks good and hasn't given me any issues. For the price, I can't complain.
Not as light as some way spendy ones, and I've heard the clamp can separate from the tube.... so WATCH IT, IF YOU BUY ONE!
Lightweight, quality craftsmanship and good ride. Also, cheaper than most seatposts out there. Buy it now. 4 more words required.
Answer: yes