seatpost diameter for old bianchi

You might try 26.6 mm. A good source for info is:

http://www.sheldonbrown.com/seatpost-sizes.html

S R Sharp said:

I've got a lugged steel frame, 70mm bb, 126mm spacing, forward opening
dropouts, says "made in taiwan" "strada" and "special tubing". Also has
a 86-87 world champion (colorado springs) sticker. I tried putting a
26.8mm seatpost from another old bianchi in it- didn't want to go in
more than a 16th of an inch or so. What would be my next logical
"standard" size to try?

Not on my list but a 1991 Bianchi Advantage (IIRC same
frame) takes a 26.0.

Any reasonably competent LBS can try a few posts with you
and determine this accurately in a minute. It's difficult to
measure a seat tube's aperture, especially one that's not
quite round. Best to slip in a post and check the fit at
least a few inches down the seat tube. Your new post should
not wiggle 4 or 5 inches in and shouldn't take any effort to
insert/withdraw. Posts are sized in increments of 0.2mm.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

A Muzi said:

S R Sharp said:

I've got a lugged steel frame, 70mm bb, 126mm spacing, forward opening
dropouts, says "made in taiwan" "strada" and "special tubing". Also
has a 86-87 world champion (colorado springs) sticker. I tried
putting a 26.8mm seatpost from another old bianchi in it- didn't want
to go in more than a 16th of an inch or so. What would be my next
logical "standard" size to try?

Not on my list but a 1991 Bianchi Advantage (IIRC same frame) takes a 26.0.

Any reasonably competent LBS can try a few posts with you and determine
this accurately in a minute. It's difficult to measure a seat tube's
aperture, especially one that's not quite round. Best to slip in a post
and check the fit at least a few inches down the seat tube. Your new
post should not wiggle 4 or 5 inches in and shouldn't take any effort to
insert/withdraw. Posts are sized in increments of 0.2mm.

Thanks, I've got a 26.0mm around here somewhere. I discounted 26.6mm
because I *thought* it was an unusual size (I may be wrong on this); I
figured the next size I would want to try is 26.4mm

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chc scs said:

S R Sharp please post how you make out. I'm in a similar situation. My
Bianchi is about the same age and also has that Colorado Springs
stricker. My model is an "Alaska" though. I have a 26.4mm seatpost which
I think is too small. I need to really tighten the seatpost binder or
the seat will drop as I ride. The database at Sheldon Brown's site and
my caliper measurement both point to 26.6mm. However in my case the
Sheldon Brown site doesn't include the Alaska (though it does include
the Strada) and my caliper is a cheap plastic one that came with a box
of drill bits so it flexes a bit.

I tried my 26.0 post and it wobbled around quite a bit so I think I can
automatically elimate 26.2 and probably even 26.4mm. If I have time I
will try to put in a 26.6 tomorrow.

Mr. Brown's site listed the Strada as a 1996 model, not sure what year
this one is.

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chc scs said:

S R Sharp please post how you make out. I'm in a similar situation. My
Bianchi is about the same age and also has that Colorado Springs
stricker. My model is an "Alaska" though. I have a 26.4mm seatpost which
I think is too small. I need to really tighten the seatpost binder or
the seat will drop as I ride. The database at Sheldon Brown's site and
my caliper measurement both point to 26.6mm. However in my case the
Sheldon Brown site doesn't include the Alaska (though it does include
the Strada) and my caliper is a cheap plastic one that came with a box
of drill bits so it flexes a bit.

Looks like 26.4mm is the best candidate. Wobbles a little bit but I
didn't have a binder bolt to tighten. The 26.6 was not easy to install,
and I gave up, not wanting to scratch the post as it wasn't mine.

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