seatpost diameter for old bianchi

[S R Sharp]

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?

thanks

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[Steve Karpik]

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

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

 

[A Muzi]

S R Sharp wrote:

> 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

 

[S R Sharp]

A Muzi wrote:
> S R Sharp wrote:
>
>> 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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[S R Sharp]

chc scs wrote:
> 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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[S R Sharp]

chc scs wrote:

> 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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