Creeping seatpost

On Mar 3, 9:12*pm, "Bill Sornson" wrote:
Bill Sornson wrote:
Jobst Brandt wrote:
Bill Sornson wrote:

Over the course of an hour' ride my seatpost will get pounded into
the frame. *This is a stock Trek 7200 hybrid and I'm reluctant to
tighten the [nylon?] clamp any more. *(Yes, I'm a large rider.)

The problem will only get worse over time. *I'm considering green
Loctite. *Will that work? *Anyone have a better suggestion?

Lots of things you can do. *Assuming the post is correct (accurate)
size, you can try a little plumber's tape or other "shim type" fix;
or use a clamp of sorts above the insertion point to help keep the
post from sliding down. *(Plastic blinky holder or a full on hose
clamp, for examples.)

The OE clamp shouldn't be nylon, I wouldn't think. *Mine are all
metal and I tend to over-tighten stuff; haven't had a problem yet.

Loctite might work, but I'd worry about it causing a "frozen" post.
Others may have experience with it though...

If it's really sliding all the way into the frame on rides, then I'd
say your post is undersized. *Visit a bike shop to measure, maybe?

Well, plumbers tape (ain't tape) is thick steel.

Geez, Jobst, for a humorless pedant you sure are funny sometimes.

A) It's plumber's tape with an apostrophe. *B) The common variety
sold in Home Despot and every other hardware store is thin, teflon
wrapping, not "thick steel" /strapping/.

Very first Google hit:http://www.wisegeek.com/what-is-plumbers-tape.htm
I'd try a section
out of a soda-pop can or beer can. *They are easily cut with
household scissors into a one inch wide band, and see if that can be
made to fit. *One full wrap or even more should do the job if it
really is an undersized post that it seems to be. *Use grease for
final tightening to prevent future water intrusion.

Jobst Brandt

Since it's sliding down so dramatically, you might be right about the
fix. You might have replied to the OP with that, and skipped the
needless (and wrong) nitpick about plumber's tape.

HTH! *(But not betting on it.)

BS

PS: *You also deleted the OP's attribution. *Yet another Usenet /faux
pas/...

And YOU call HIM (or anybody else) a pedant -- our local net-nanny??

If you had friends ... and if they were TRUE friends ... they'd give
you a little more insight into how YOU come across.....

Not much chance of that, though :-)

On Mar 8, 12:49*am, TBerk wrote:

Where, in general?

The Lower 48 (USA).

*I think the two mentions of a generational and
geographical influence on the use of a term are making a difference in
people's sticking to their guns about being right.

Generational, maybe. Even though Teflon was first marketed in 1946 by
DuPont. I don't know about the advent of plumber's tape; there is one
company that started making it ca. 1962 but that's all the time I'm
going to spend on when tef tape first hit the market.

Being "right"? Well, if you don't want to believe Google, which is a
sort of ipso facto descriptive dictionary, defining "plumber's tape"
as teflon tape by which ordinal position it has in a list of meanings,
there you go.

The Teflon tape, being tape, is a relatively new invention compared to
the rolls of metal strapping being referred to for a very long time as
'tape'.

I had a taste of "lingo" that was similarly inapt when I first
apprenticed. Sort of a hazing or initiation "ceremony", an excuse to
mistreat and browbeat the newbies. The usual crap, getting in the way
of getting work done.

IOW, you "had to learn the lingo", essentially slang terms that had no
real relation to the parts or supplies referred to. "Spaghetti" for
1/4" ID chrome supply tube, for instance.
"Hanger strap" is descriptive and accurately so in the case of most
plumbing applications, although, as noted here and elsewhere, it is
used inventively in many other applications.

Still, the thread started with "how do I keep my seat post from
slipping down?" Instead we get personal jousting back and forth.

This is rbt. Jousting happens.

For my two cents I'll add that the shim made from soda can works, that
you might pull the post and thoroughly clean both parts of any surface
slipperiness, and that scuffing the surface to increase friction would
be a consideration. As would be replacing and/or augmenting the
current clamp with another.

Something isn't to spec here, is my guess. Seat post too small, seat
tube too big, effectively. Out of round post? Poorly reamed (or
"other") seat tube? Whatever. The clamp isn't working, according to
the OP.

(as noted) Make sure the clamp can work, get a post that is a snug
"light drive" fit in the seat tube, and use reasonable clamp force to
keep it where set, after greasing well prior to install.
--D-y