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Seatpost Sizing(9 posts)

Seatpost SizingTrev84
Sep 25, 2003 5:40 PM

I've got a problem here, I've got a new Carbon frame
on order.

I went ahead and purchased a "Deda Black Stick - Mag." Seatpost in a standard size (Or so I thought?)- 27.2 x 270mm.

Now I find out that the Seatpost diameter required of
this Frame-set is 28.00mm!!

Do the .8mm matter - Prabably??

Who makes a 28mm Seatpost??

Waht about shims??


re: Seatpost SizingRusty Coggs
Sep 25, 2003 6:43 PM
It matters.A proper shim can work if you find one of the right size,but I don't see one listed in the QBP, as there is not enough difference in the diameters. Don't think I would try a beer can for that much difference though.
You sure? You getting a carbon BMX?...TFerguson
Sep 25, 2003 7:15 PM
I can't find anything that goes to 28.0 except for one shim that goes from 26.4 (BMX). Good luck.

re: Seatpost SizingTrev84
Sep 25, 2003 7:52 PM
Me again!

The bike is an "Opera Leonardo."
Now I know that the "Colnago C-40" also uses the
same size - 28mm, but I couldn't possibly put a
"Colnago" branded Seatpost on a "Pinarello" product
now could I?

I could get like an Italian Hemmerhoid(?) curse or something??!!

Help (Again)!
USE makes one to go from 25.0 to 28.0. (nm)TFerguson
Sep 25, 2003 8:14 PM
re: Seatpost Sizingcharlieboy
Sep 26, 2003 4:51 AM
According to their website Opera make a 'Leonardo' 28 mm seatpost to go with the frame - what's wrong with that? Surely your supplier will do you a deal on the price? It looks like a nice post too...
roll your own...C-40
Sep 26, 2003 5:23 AM
What you need is a homemade shim about 2 inches long, made from .015-.016 inch shim stock. .015 shim stock is very common, available in plastic, brass, aluminum or stainless steel. Good auto supply stores often carry shim stock. A sheetmetal shop would also be a potential source.

I would cut the top of the shim to create a couple of small tabs at the top the could be bent over, after the stock was rolled round. Otherwise, you could have problems with the shim falling down into the seat tube.
Go with the correct seat post, or you'll be sorry......nmMR_GRUMPY
Sep 26, 2003 5:55 AM
re: Seatpost SizingTrev84
Sep 26, 2003 5:24 PM
You're all correct!

I really would rather not use a shim.

And, "Yes!" "Operabike" does show a specific
fit Seatpost, but like everything in this world
"Italian," It is not available, Yet(?)!

Remember, When the "Ergobrain" was announced?
It wasn't available until almost a year later!

I still can't beleive I'm even getting the "Leonardo."
It's all theoretical until I actually do(if?)
receive it, but I would like to have a Seatpost on-
hand to (Maybe!) ride it.

Thanks for all the input so far!