Aubergine 

The side of the caliper that should mark 0 is out of place.

tomato coupe

It's in the right place. You read the caliper at the scribed marks -- "OUT" is for measuring ODs and "IN" is for measuring IDs.

Aubergine 

Oh gosh, I did not even see those marks. Old eyes . . . Thanks.

bboy314

The very specs you’re quoting clearly state 26.8 for the diameter. But it seems like any real help is a lost cause here, so my last bit of advice is to just get out the hammer and make it work.

Insidious C. 

It used to be that seatposts, expecially Japanese made, would measure 0.05mm under nominal size. It does not surprise me that a post measuring 27.22mm is too tight in a frame that previously had a 27.15mm post. Assuming your Gary Fisher really is 27.2 nominal, you have two choices: 1. Sand down the new post (if it is aluminum). This is commonly done, although I cannot say I approve. 2. Get a smaller post.

Before doing either 1 or 2, you might want to schlep the bike to a shop and use their seat post gauge. It is a handy tool that is more reliable than calipers for this task. Good luck!

PromptCritical 

Yes, due to climate change the United Nations changed the size of all metric measurements between 1998 and 2001

shelbyfv

Typical BF 1) Assume the part is out of spec rather than chosen incorrectly. 2) When incorrect choice becomes clear (post is larger than spec for bike) then obfuscate and attack the messengers. So much better to say "Thanks, I'll order the correct size" than to keep digging a hole.

DorkDisk

That caliper does not read 27.2, look at it again; it is clearly 26.4.

Atlas Shrugged

This is another classic example of how ridiculous things have gotten. Take the simplest least technical challenge possible for a rational adult, which most of us would be embarrassed to ask for advice on. Make bizarre and unfounded assumptions then attack anyone who actually takes the time to help and point out the logical solution.

veganbikes

You are claiming no useful information but your own? So I would like to know did you come here to hear an echo chamber? Or did you actually come to listen and decided that listening to good info was bad?

So where is the small talk and non-sequiturs in this thread for real?

No I cannot pump a tire...seriously? Because we have given you useful information about your seat post not being as you want it to be because Billionaire Jeff Bezos sells a lot of one size? I own a bike shop and have worked in bike shops for over a decade now working my way up to the top doing nearly every role in some form or another. I am a bike nerd who spends most of their time around bikes in some form or another. I know I am not always right and there is a lot I can learn but that is not to say I don't know quite a bit it is to say I will always be a student and open to new ideas and new information about my chosen field and love in life. Any good mechanic/sales person/bike enthusiast should have a similar mindset of wanting to learn and pursue new concepts as cycling is forever changing. No longer are we riding direct drive "penny farthing" we know have gears in the front and back that can be electronically shifted we have carbon bikes that can be made into whatever shapes you want and so much science and technology going into bikes it is amazing to see how far we have come good and bad.

You also claim in your own post at the bottom that the seat post size for your Miyata is not 27.2 and is in fact 26.8 which I and others mentioned to you was a high possibility or the actual known sizing.

If you want help be open to help, if you are here to argue and claim nobody is helping you because they cannot magically make the wrong sized post fit in the hole then maybe find a place that is more of an echo chamber! We did try to help you and yes there are some folks are get sarcastic but in the end that usually only happens when someone won't listen to reason or make claims that are blatantly false.

I am happy to help people but I cannot help someone who does not want help. Be thankful that people have been willing to help in some way or another. Maybe it is not perfect maybe not every single answer is going to be the best but to shut down good advice because it isn't what you had wanted to be said is just silly.

DangerousDanR

Take everything off the frame... put it in an oven. Might take the paint off, but raw steel will look cool. Put the seat post in a very cold freezer, or better yet, dip it in liquid nitrogen. Now, due to the expansion and contraction of metals due to temperature you might be able to install that post in that frame.

You will no longer need to use a seat post clamp, saving precious grams. But be sure to get the height correct the first time, because you are never going to get your shrink fit system apart...

Or enlarge the seat post hole diameter with the risk that the frame will be too weak. Alternatively, you could make the seat post smaller in diameter with the risk that the post will be too weak and will fail while riding. Or maybe just accept that your old frame uses a seat post diameter which is no longer in common use and get on with life.

Camilo

No

shelbyfv

FWIW, I've just noticed that this is the third thread in as many days where OP has had trouble measuring stuff. Frame, tires, now seatpost.

elcyc

You should CLEARLY consider deleting you post; you've got egg on your face, toots.

elcyc

We notice you are not pointin' any fingers here or suggestin' solutions* to the OP. Just ventin' and rantin' with GENERIC HEDGES.

*The solutions were in the URL links at the bottom of my flowery post. So I figured it out; and many of y'all gotta chance to to kick the dog. Niiiiiice!!!

DorkDisk

Blue line is where 27.2 should be. Red line is the measurument, and it reads what? You tell me

Maelochs

I have not learned much in this life, but of the few things I have learned, one of the best and one for which I am most grateful is the ability to recognize when it is time to say "I was wrong."

Glad this is not a case where I have to use that skill, but it is a useful skill.

elcyc

Then I'll say it for you, toots. Maelochs: "You are wrong." Keyboarding can become an unskilled task.

tomato coupe

Some people just don't know when to quit digging.

Atlas Shrugged

You (an adult I assume) are struggling to fit a seatpost need to ask for help on a public forum then attack everyone who tries to help. Now you beak off at someone who calls you out on it.

What’s your next thread going to be, why you can’t fit your Presta pump on a Shraeder tube?

The post doesn’t fit in your frame, get over it!

elcyc

The title / subject of the OP was "27.2mm seatpost 1mm too wide".
As noted in the UK forum, a solution is to either sand it or lathe the post. One could sand the ID of the seat tube, too. But since I have the same issue with the Satori post on two separate bikes, the Satori "27.2mm" seatpost is the issue. The seat tube has the adj. clamp. It should allow for small discrepancies in posts of the popular 27.2mm size. That was part of the OP query.
Nobody here at BF gave clear a solution -- just hubris and small talk; the UK forum or R-ed-it threads do provide practical solns.
BTW: This is literally my travel pump--got it at Wal-mart:

Refs:
https://www.walmart.com/ip/Blackburn...lack/681175293
https://www.bikeradar.com/advice/buy...ides/seatposts

tomato coupe

Actually, that guy was given some sound advice and he didn't give up on BF. He took the advice of several posters and took his frame to a shop to have it measured, and that was the end of it. You could learn something from him.

Shady Rascal

Looks like you're measuring a seatpost shim in this picture to me. The irregular dark colored ring there between the frame tube and the post....

seypat

26.8 is the correct size. Here is a 512 with the original post listed. If it has triple butted tubing(which it does) it takes a 26.8. Sand, lathe, grind, whatever that 27.2 down to 26.8 or by one from the A-zon.

https://aberrance.com/bikes/512/specs512.htm

bboy314

I think “acquire the correct size post” is about as practical a solution as can be - certainly more so than taking a cheap Amazon seatpost to a lathe. But I’m curious as to what helpful advice you’re getting elsewhere.