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22.2mm seatpost too small to fit old school frames.....22.6mm???

#26 2010-09-08 11:07am

stonie
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

BRIMX wrote:

Bought this NOS post for my 87 Pro Series but didn't realize it was 22.6. Just a hair to large.

http://i961.photobucket.com/albums/ae97 … G_7692.jpg
http://i961.photobucket.com/albums/ae97 … G_7694.jpg

Thanks for selling me the 22.6mm GT Seatpost, here it is mounted on my ride!   
That was the missing piece I was needing for the frameset, I'm a happy camper!!  big_smile
Feedback coming your way now Brimx.

http://i298.photobucket.com/albums/mm272/306bikes/GTProSeries4.jpg
http://i298.photobucket.com/albums/mm272/306bikes/GTProSeries3.jpg
http://i298.photobucket.com/albums/mm272/306bikes/GTProSeries2.jpg
http://i298.photobucket.com/albums/mm272/306bikes/GTProSeries1.jpg
http://i298.photobucket.com/albums/mm272/306bikes/GTProSeries5.jpg


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#27 2010-09-15 4:46am

zombie_jesus
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

This is quite worrying. Hopefully the 22.2 GT layed-back will slot in the 85 World Tour that I haven't even purchased yet...  Is this a common issue or just sporadic? I've been out the game sooo long neutral


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#28 2010-09-15 9:21am

stonie
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

zombie_jesus wrote:

This is quite worrying. Hopefully the 22.2 GT layed-back will slot in the 85 World Tour that I haven't even purchased yet...  Is this a common issue or just sporadic? I've been out the game sooo long neutral

I have a 89 Mach One that uses the same 22.6mm oversize seatpost,
but I don't do freestyle bikes so I really couldn't tell you...sorry!


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#29 2010-11-20 4:51am

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

I am in the same boat, as some of the above.  I need a 22mm, or so I thought, because a 22.2mm did not fit.  When I mic'd the 22.2 post, it actually was 22.4 or 22.5 in some spots.  Then I found an actual 22.2mm pipe that was really 22.2mm, and it fit.  However, it is a dull heavy pipe.

Why do mfrs. list something as 22.2mm and it is actually bigger?  Are the tolerances that far off?  Now I need a 22.2mm that is really 22.2mm.


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#30 2011-01-16 7:55am

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

Yeah, maybe some mfrs do stamp the wrong size
but I don't think the major companies would do so.

Either way a 22.2mm GT Seatpost is way to small
for my 88 GT Pro Series and GT doesn't make a 22.5 or larger post.

This is where it doesn't add up.
Did GT ship out 88 Pro series with too small a seatpost and just tighten
down the clamp regardless, or did they come with a shim, or what???


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#31 2011-01-16 8:24am

1979
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

Can't definitively answer you on the 88 Pro but here's what I've come across first hand

88 Vertigo 22.6
85 Windstyler 22.6
84 DB Viper 22.6
87 Decade  22.5
85 California  22.5
86 Dyno Compe 22.5

I believe this is why more often than not we come across cracked keyholes, once the stock post has been removed & replaced with the readily available 22.2. Since my 88 GT Vertigo came stock with a 22.6, I think it's safe to assume that GT did make seatposts in that size and yours originally came with one.

Last edited by 1979 (2011-01-16 9:05am)


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#32 2011-01-16 10:41am

tmac
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

stonie wrote:

Yeah, maybe some mfrs do stamp the wrong size
but I don't think the major companies would do so.

Either way a 22.2mm GT Seatpost is way to small
for my 88 GT Pro Series and GT doesn't make a 22.5 or larger post.

This is where it doesn't add up.
Did GT ship out 88 Pro series with too small a seatpost and just tighten
down the clamp regardless, or did they come with a shim, or what???

There is definitely an issue here.  I personally think GT and many of the other companies BITD were just sloppy.  Not exactly fine Italian made bikes here.  I suspect (don't know for sure) they installed the shims at the factory and just sent them out.

I recently picked up an '87 Robinson Pro.  This is a survivor with what I belive to be all stock parts.  It came with a professionaly made plastic shim to accomodate the standard 22.2 Robinson laid back post.

I've also got an '88 GT Pro Series with an early '90s GT post that seems to fit fine w/o a shim. I'll have to measure that post to see if it's 22.6.

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#33 2011-01-16 12:33pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

1979 wrote:

Can't definitively answer you on the 88 Pro but here's what I've come across first hand

88 Vertigo 22.6
85 Windstyler 22.6
84 DB Viper 22.6
87 Decade  22.5
85 California  22.5
86 Dyno Compe 22.5

I believe this is why more often than not we come across cracked keyholes, once the stock post has been removed & replaced with the readily available 22.2. Since my 88 GT Vertigo came stock with a 22.6, I think it's safe to assume that GT did make seatposts in that size and yours originally came with one.

I screwed up on my last post but can't edit.
Your correct, GT did make a 22.6mm which is
what I have installed now, in the pictures.

Took me months to track down that seatpost  sad

So if Gt's came with the correct size seatpost back in the day
then where are all the 22.6mm post now? Did us BMX
guys/gals actually lose 1000's of seatposts or is someone
hoarding them all?

I go with tmac and say that GT didn't give a crap and just used a shim.
That makes better sense losing shims over the years than seatpost.

But who am I to say, I don't know  lol


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#34 2011-01-16 1:19pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

It's a tough size to score!  You can add the Aero Cruiser in "my bikes" to the list of this size.

It could explain the scarcity of them, compared to 22.2.  I'm sure shop owners bitd knew it was the proper size to sell, so perhaps many of them vanished just via replacements.


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#35 2011-01-16 2:03pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

I can verify that the post for your Redline is indeed a factory sized post of 22.6MM. I've been trying to source the correct post for my 81 MXII and also noticed that a 22.2MM was a tad loose in the frame. I contacted a member that has a un-touched 82 survivor and he verified that the post was indeed marked with a 22.6MM size.

This is interesting considering that (as mentioned) you never see, nor hear about any posts in 22.6, wonder why that is is? Did the factories maybe use the 22.2MM size in order to keep the posts from getting stuck years down the road?

Things that make you go...Hmmmmmmm!!

Last edited by MSMXII (2011-01-16 2:03pm)


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#36 2011-01-16 2:23pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

Yeah, this whole deal with seat posts not fitting correctly could have been easily
been avoided is the bike industry gave a crap.

The key hole cracks are most certainly to be blamed on the mechanic
and not the incorrect seat post though.

Better to use a Coke can and
rig it up than tighten down the frame to fit the seat post.  lolroll

That same mechanic probably uses a hammer to knock out the stem.  sad

Gorilla mechanics 101


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#37 2011-05-01 12:03pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

wastingmoneylikeitwasfree wrote:

It's a tough size to score!  You can add the Aero Cruiser in "my bikes" to the list of this size.

It could explain the scarcity of them, compared to 22.2.  I'm sure shop owners bitd knew it was the proper size to sell, so perhaps many of them vanished just via replacements.

They aren't that scarce, just have to be looking for them that's all.


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#38 2011-05-01 12:05pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

Here are shims so you don't have to use soda cans. lol

http://shop.ebay.com/i.html?_from=R40&a … Categories


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#39 2011-05-01 12:12pm

stonie
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

jkraig wrote:

Here are shims so you don't have to use soda cans. lol

http://shop.ebay.com/i.html?_from=R40&a … Categories

I'm not using shims or soda cans....but thanks anyway!
I have found the correct seatposts for all the frames I have.


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#40 2012-07-16 5:32pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

Better add my 1982 Torker 26 to the list. 22.6 fits 22.2 is way too small.  I just got a 22.7 fluted post from a guy on here and will try it when it shows up the only problem is I am not a fan of fluted posts. The 22.6 I have needs re-chromed and I plan to do so just as soon as I get the other post.  My Torker frame had very little use and was not reamed out. The post tube is the same all the way to the bottom of the frame.  This is a legitimate problem. Not just some whiny nonsense. Shut up and go ride is not any sort of an answer nor is go buy some micrometers, we already know there is a problem.  Why don’t we compile a list of all known frames with this issue and also a list of seat posts that have been found to fit them? I don’t know about you but a slice of an aluminum can doesn’t take the place of the correct post size on my bike.

Last edited by CruiserGuy (2013-06-23 11:03pm)


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#41 2012-07-16 5:51pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

fyi some bike frame makers new there frame had a odd size seat tub. they even sold there frames with a seat tub shim incloded. in ther frame kits or even instaled on there complet sold bikes.


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#42 2012-07-17 2:36pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

my gt made 1989 robinson came new with shim straight out of the box. tried fitting post without and it's just about impossible to tighten.


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#43 2012-08-25 8:56pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

coffin2death wrote:

my gt made 1989 robinson came new with shim straight out of the box. tried fitting post without and it's just about impossible to tighten.

Yep, probably the reason why so many frames are cracked at the keyhole.      sad


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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#44 2012-10-11 4:01pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

Better add my 84 Pro Racer to the list along with my 82 Torker 26.


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#45 2012-10-11 6:57pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

On my German Centurion it  took a slightly larger post too. I had to use 1/2 of one  of those wald shims.Works fine now

Last edited by butlerglc (2012-10-11 6:59pm)


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#46 2012-12-09 8:55pm

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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

i have the same problem! i have a 79 mongoose that uses a 7/8 seatpost but when i put in a 22.2 seatpost it's too small and you can't tighten it up and ride it! whats with that? i'm going to use my digital caliper tomorrow and measure the seat tube!mad


at bob's kustom bikes i got framed!

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#47 2012-12-09 10:02pm

esw
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

I have two 22.6 redline posts and I had a 22.5 schwinn layback post. All were fluted chrome cromo posts. These bikes had corect post made to fit them. I thin har made one too.

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#48 2012-12-10 6:04pm

staubach
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

I cut a Wald shim that I got somewhere online, either Ebay or Porkchop. Did the trick perfectly. It's a 96' Dirtbike frame, Primo Rod 22.2 post. Without the shim the post would move with moderate force applied side to side.
http://imageshack.us/a/img444/598/20120211140956418.jpg
http://imageshack.us/a/img339/9359/20120211141012172.jpg

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#49 2013-06-18 6:44pm

PpElcabro
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

snarehead123 wrote:

i have the same problem! i have a 79 mongoose that uses a 7/8 seatpost but when i put in a 22.2 seatpost it's too small and you can't tighten it up and ride it! whats with that? i'm going to use my digital caliper tomorrow and measure the seat tube!mad

have an 85 cali that does the same to me...

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#50 2013-06-19 8:07am

stonie
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Re: 22.2mm seatpost too small to fit old school frames.....22.6mm???

The list of frames that require a shim or larger than 22.2mm is just getting longer


Gnarly is when it's beyond radical, it's balls out danger, & or perfection, & or skill or all of that combined. Nobody can shred like that guy, he's gnarly.                                        \m/  ( º . º )  \m/

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