27mm seatposts

Ian G Batten said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit, so
unless both are mislabelled it's consistent.

I'd like a more rigid seatpost, as it appears to flex somewhat if the
suspension is locked out. But 27.0mm seatposts are thin on the ground.
Thompson's layback post, for example, starts at 27.2mm. Any thoughts?

ian

There seem to be quite a few on Wiggle. The Titec is fairly stiff and a
reasonable price. Otherwise there are plenty of more expensive ones. Several
(X-Lite, Use etc) use a shim system to fit.

Tony

in message <[email hidden]>, Ian G Batten

(') said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit, so
unless both are mislabelled it's consistent.

I'd like a more rigid seatpost, as it appears to flex somewhat if the
suspension is locked out. But 27.0mm seatposts are thin on the
ground.
Thompson's layback post, for example, starts at 27.2mm. Any thoughts?

I have a spare Ritchey 27.2 with slight layback which came on my
Cannondale. It's spare because in my opinion it's of equivalent worth
to a fetid pile of steaming dingos kidneys; the one-bolt design tends
to slip when you go down steep rocky bits leaving you with a saddle
pointed God knows where, which is decidedly uncomfortable. I replaced
it with a BBB two bolt post which was cheap and is very good - I have a
similar (but much larger diameter) BBB post on my Mantra.

I have to admit I'm surprised at Cannondale and Marin using such small
diameter seatposts because as you say they do flex. Having said that
I'm pleased with my BBBs - they aren't the lightest things around but I
haven't noticed the flex problem so much.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/
.::;===r==\
/ /___||___\____
//==\- ||- | /__\( MS Windows IS an operating environment.
//____\__||___|_// \|: C++ IS an object oriented programming language.
\__/ ~~~~~~~~~ \__/ Citroen 2cv6 IS a four door family saloon.

Hi Ian, I have on occasion seen a few 27.0mm Campagnolo Record
Aluminum Seatposts show up on ebay. Some of these are quite sturdy,
some have fluted posts, and I doubt if you would get any flex with
these, yet still retain very light weight.

There is one seller who is in Germany (Cyclo network), who constantly
comes up with stuff like this. Perhaps try a search? Hope this idea
helps, Mark

Ian G Batten <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit, so
unless both are mislabelled it's consistent.

I'd like a more rigid seatpost, as it appears to flex somewhat if the
suspension is locked out. But 27.0mm seatposts are thin on the ground.
Thompson's layback post, for example, starts at 27.2mm. Any thoughts?

ian

Quoted message said:

Hi Ian, I have on occasion seen a few 27.0mm Campagnolo Record
Aluminum Seatposts show up on ebay. Some of these are quite sturdy,
some have fluted posts, and I doubt if you would get any flex with
these, yet still retain very light weight.

There is one seller who is in Germany (Cyclo network), who constantly
comes up with stuff like this. Perhaps try a search? Hope this idea
helps, Mark

Your LBS can get 27.0 Campy posts from Euro Asia. There have been problems with
cyclo network delivering items wom on ebay.
Phil Brown

Ian G Batten <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit,

---------------

If you want to try using the 27.2 you have.... .2mm isn't "too" hard
to remove with some sandpaper and elbow grease. Takes a while, and
you'll get nasty black Al everywhere, but its possible.

d

"Ian G Batten" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit, so
unless both are mislabelled it's consistent.

I'd like a more rigid seatpost, as it appears to flex somewhat if the
suspension is locked out. But 27.0mm seatposts are thin on the ground.
Thompson's layback post, for example, starts at 27.2mm. Any thoughts?

ian

Have you checked ebay?

I have a 27.0mm Superbe Pro seatpost. I know if I have one, they had to make
more... Check for XC Pro too. Same basic SP, just longer.

M

If I were to need one, not finding a scrap one I would do this.
I would take a Campagnolo two-bolt 27.2mm post and reduce it to 27.0.
No need to have a lathe. A belt sander is enough, and quite appropriate.

Also, it can be done by a metal polishing shop.
Here, the inconvenience is that the seatpost gets very hot when being
polished; due to thermal expansion of the aluminum alloy, it is not so
easy to confidently measure the diameter while doing the job.

Sergio
Pisa

Ian G Batten said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit, so
unless both are mislabelled it's consistent.

I'd like a more rigid seatpost, as it appears to flex somewhat if the
suspension is locked out. But 27.0mm seatposts are thin on the
ground. Thompson's layback post, for example, starts at 27.2mm. Any
thoughts?

27.0 was a common size for mountain bikes in the early 90s. I'm pretty sure
that's what my Diamond Back had, and they made tons of those. So there's bound
to be a healthy supply of these posts somewhere. You might try Hokie Spokes
here in Blacksburg -- they have a whole wall of bins with nothing but seatposts.
Tell Dave I sent you -- www.hokiespokes.com for the phone number.

Matt O.

Matt O'Toole said:

Ian G Batten said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit, so
unless both are mislabelled it's consistent.

I'd like a more rigid seatpost, as it appears to flex somewhat if the
suspension is locked out. But 27.0mm seatposts are thin on the
ground. Thompson's layback post, for example, starts at 27.2mm. Any
thoughts?

Google can find 'em : http://tinyurl.com/34hvk

** Phil.

Matt O'Toole said:

27.0 was a common size for mountain bikes in the early 90s.

It continued to be a common size for steel mountain bikes with 28.6mm seat
tubes while steel mountain bikes remained common. Most steel Konas, for
example, many steel Marins, the earlier steel Stumpjumpers and Rockhoppers.
It's still one of the most widely available sizes, though not as common as
27.2

Quoted message said:

So there's bound to be a healthy supply of these posts somewhere.
You might try Hokie Spokes here in Blacksburg -- they have a whole
wall of bins with nothing but seatposts.

and Phil Brown had written:

Quoted message said:

Your LBS can get 27.0 Campy posts from Euro Asia

The uk.rec.cycling crosspost, Ian's EU e-mail address and British ISP
suggests that a North American dealer may not be the most convenient.

James Thomson

Ian G Batten said:

I'd like a more rigid seatpost, as it appears to flex somewhat
if the suspension is locked out. But 27.0mm seatposts are
thin on the ground.

Perhaps not quite as common as 27.2, but certainly among the most common
sizes.

Quoted message said:

Thompson's

Thomson's

Quoted message said:

layback post, for example, starts at 27.2mm. Any thoughts?

If you really find flex a problem, bear in mind that the materials used in
most of the posts on the market have about the same specific stiffness, are
simple cylindrical plain-gauge extrusions, and can only therefore be
stiffer than your OEM post if they're also heavier. Expensive posts using
stronger alloys generally do so in order to allow thinner tube walls to be
used, reducing weight, but also reducing stiffness unless the weight is
redistributed to the areas of greatest stress. Thomson and Ritchey use an
oval bore, increasing fore-aft stiffness at a given weight. A Ritchey Comp
is quite cheap, as stiff as anything else you can buy, has a little
layback, and is widely available in the UK. The KAlloy model, made in the
same factory, is a little heavier, cheaper, but just as stiff.

You might keep an eye on eBay for an old steel Shimano XT or DX post -
there's an unused one on eBay.de right now [item 3680550946]. It never
hurts to ask if the seller will ship to the UK.

Using a shimmed post would be a waste of money, as reducing the diameter is
a great way to reduce stiffness unless the tube walls are also beefed up
out of proportion.

Having said all that, I'm heavy, and my two hardtails both use long 27.0mm
posts (a light Syncros, and a Ritchey Comp). I wonder how much your
seatpost can really be flexing unless your rear end is also taking more of
a battering than is good for it.

James Thomson

Quoted message said:

The uk.rec.cycling crosspost, Ian's EU e-mail address and British ISP
suggests that a North American dealer may not be the most convenient.

With the telephone and Fedex any place is as convenient as any other. I am as
happy to sell a frame to France as to a neighbor here on the West coast of the
USA.
Phil Brown

Ian G Batten <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

My 2004 Mount Vision has an unbranded seatpost that is marked 27.0mm.
And it presumably is: a 27.2mm seatpost I have around won't fit, so
unless both are mislabelled it's consistent.

I'd like a more rigid seatpost, as it appears to flex somewhat if the
suspension is locked out. But 27.0mm seatposts are thin on the ground.
Thompson's layback post, for example, starts at 27.2mm. Any thoughts?

ian

I got one here last month for $10:

http://www.theped.com/blowout.htm right side, almost all the way to the bottom:

Quoted message said:

27.2 Ritchey road seat post $14.95 fits M2 and A1 road and many other high
quality frames, 250mm, silver. OEM (Original Equipment for Manufacturers)

It says 27.2 but they have many sizes including 26.8 and 27.0 in silver and black.

-Doug

Phil Brown said:

With the telephone and Fedex any place is as convenient as any other.

.... if you ignore shipping delays, currency conversions, time differences,
import duty, taxes, postal charges, customs holdups, greater potential for
loss or damage in transit, difficulty of pursuing warranty claims ...

Quoted message said:

I am as happy to sell a frame to France as to a neighbor here on
the West coast of the USA.

Of course you are, but I assume that you don't ship overseas at your own
cost, pay import duties for your foreign customers, etc. In the case of a
special bargain, a rare gem, or a particularly favourable exchange rate, it
can make sense to order from overseas. When an equivalent product is
available locally at comparable cost (as in the case of Ian's seatpost),
why make the effort?

How many frames do you export to France?

James Thomson