13 November, 2006

ATAX Internally Expanding Seat Post



Here is something you don't see often, a seat post that expands like a stem. So no seat tube clamp is required. It's a bit heavy so no weight is saved, but you do get that cool clean look. A number of Constructeur bikes used posts like this, though usually custom made. Of course you can remove the bolt and expander and use it as a regular post, but that would be a shame. There is a black plastic plate that goes under the rails, shock absorber? The polishing is very nice. I might save one for my custom city bike. We only have a few of these, but if your bike is worthy....

Right now we have some in 27.2mm and will get a few in 26mm. The price is $50.

UPDATE: These are sold out and, so far as we know, are no longer available anywhere in any size.

16 comments:

neil m berg said...

Oh man, do I need one of those. How?

Chris Kulczycki said...

We have them in 27.2. Please e-mail if that size works. We might be able to get them in some odd sizes too.

Josh said...

Hi,

I scrounged an old "Bridgestone SuperSpeed" from a labmate that has the cast aluminum lugs found on some Bridgestone bikes. Because you can't compress cast aluminum, it came with a seatpost that had a compression fitting like a quill stem. Unfortunately, it was way too short, so I fashioned one out of a cheap aluminum Kalloy seat post. this would have been a much more elegant solution, but probably more than a beater fixed gear deserves.

Josh

Olyfixie said...

These were really popular at a Concours d'Elegance in Seattle about 12 or 14 years ago. As Chris suggests, it permits the framebuilder to approach the seatlug in a whole new way. I'd use one of these with caution, though; it seems to me (on an intuitive level, rather than based on anything empirical) that you could risk buldging a light-gauge seat tube.

david_nj said...

Agree with Olyfixie re the bulging -- I've had seat tubes bulge where the alloy seatpost corrodes a little. Makes no difference performance-wise but it doesn't look so sharp. Superultrarespectfully: isn't this one of those solutions in search of a problem?

neil m berg said...

David's right about the impracticality, but I love these odd ball things. My project next year is a custom bike for my daughter. David has probably convinced me that it should be fillet brazed. Concealed cables. Maybe a mixte. I've already accumulated new Campy Ergo 8 hubs, cogs, etc. I'm looking for a 165 Mavic starfish crank. Everything sleek and sculptural. So slippery she won't even have to pedal. This post is perfect.

John Price said...

Expander post or not it's a pretty one.

So, maybe I missed it, but how much are you selling them for ?

John Price

david_nj said...

Hey Neil what the heck is your email address? If you don't want to post it maybe CK could forward it.

neil m berg said...

neilmberg@yahoo.com

superfreak said...

Will this Atax post work in Bridgestone Kabuki with the cast Aluminum lugs? What size post does Kabuki uses? thx superfreak.

nv said...

Chris,
Would you consider stocking the Nitto Crystal Fellow and the Nitto Jaguar? I realize there are a few sources for these, but you have very nice Nitto prices and I generally like combining multiple items when ordering...
nv

Chris Kulczycki said...

NV, Yes, thanks for the reminder. Nitto was supposed to get back to me with pricing info.

nv said...

Great Chris!
Kindly let us all know if/when they arrive!
Cheers,
nv

Anonymous said...

What is the length on these? I have one from a late 80's Peugeot (so no other style that I know of will work) but it is not long enough to give me proper height - I need to go up probably 2 more inches. I would gladly trade with someone if I can get one of these that's long enough.

Anonymous said...

I'm confused on how to purchase one of these through the site. The link forwards me to the home page where there are none listed in seatposts and saddles section. How do I get this seatpost?? wphattpat@yahoo.com

Michael said...

Do you guys still sell these seat posts? I need a 25.8 or so. Was wondering if that is possible?