You are not logged in.

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

#101 2016-05-19 9:19am

ouch1976
Pro Member
From: Long Island, NY
Registered: 2014-12-31
Posts: 700
Bikes: 3
For Sale: 3
Offline

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

1985 Mongoose Expert comes stock with a 22.6mm...

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/217008/img_20160519_115344304573de789c1.jpg

Offline

 

#102 2017-01-09 2:11pm

cmc
Pro Member
From: Austin, TX
Registered: 2009-05-05
Posts: 3998
Bikes: 8
Offline

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.

Exactly right.  I cracked the top of the seat tube off my 87 Mongoose Decade frame, back around 1993.


20", 22", 24", 26", and 700c !

Offline

 

#103 2017-05-12 7:14pm

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

The band-aid shim thread         tongue


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/

Offline

 

#104 2017-12-03 7:16am

enthuziast
BMXer 4 Life
From: illinois
Registered: 2013-11-01
Posts: 4002
Website
Offline

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

My 1983 redline pl24 frame won't accept a 22.2. Can't get it to tighten down, so I'm on the hunt for a 22.6. Hopefully it does the trick

Offline

 

#105 2017-12-03 1:26pm

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

enthuziast wrote:

My 1983 redline pl24 frame won't accept a 22.2. Can't get it to tighten down, so I'm on the hunt for a 22.6. Hopefully it does the trick

or 22.5 will work             wink


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/

Offline

 

#106 2017-12-03 1:27pm

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

ouch1976 wrote:

1985 Mongoose Expert comes stock with a 22.6mm...

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-image … e789c1.jpg

big_smile

Last edited by stonie (2019-04-25 9:56am)


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/

Offline

 

#107 2019-05-20 7:26am

eric12
Pro MemberNI4NI
From: M'Boro, TN
Registered: 2012-10-09
Posts: 18742
Offline

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

oldnky wrote:

Crashman wrote:

julieruin wrote:

Fellas, I'm just coming across this thread now, as I'm starting my first ever resto project.  It's a '96 Mach One - but I'm still having the same seat post issue.  Bought a new 22.2 mm seat post to replace the sad, bent one that came with my craigslist find...and its visibly smaller than the stock post, even though they're both stamped 22.2.  It tightens with the clamp, but I haven't had a chance to ride on it yet and I'm not confident it will hold.

Anybody have pictures of the beer can shims?

Mine tears every time I remove the post completely, one of these days it won't be re-usable. I can slide up and down fine as long as I don't go to the post end.

Min shim is doubled. I got there by cutting a rectangular section then folding it in half before rolling it around the post. The fold makes a lip when you roll it, and the lip is handy for positioning.

The circumference of a 22.2mm post is just under 2.75 inches. You can get a shim about right by cutting the sheet 2.625" before rolling (two and five-eighths inches)

Now if someone could suggest a common source of aluminum sheet that's twice as thick as a beer can...

I tried the coke, beer can trick. Too thin and flexible. Went to Lowes and bought the smallest sheet metal, aluminum dryer venting piece I could find, maybe $3.00 -$4.00. My post is 22.2 but was too small for my 81, Quadangle. After some cutting and trimming, no more slippage.

You have a pic of it installed?


You can't put a price on peace of mind.

This too shall pass.

The world went and got itself in a big damn hurry.

Offline

 

#108 2019-05-20 8:20pm

1979
Pro Member
From: PA
Registered: 2008-03-20
Posts: 1576
Bikes: 6
For Sale: 1
Offline

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

I've done the can shim before as a temporary fix. Sometimes you have to wrap the can 2 or 3 times around the seatpost to get a good pinch.


It's yours. Do what you want with it smile

Offline

 

#109 2019-05-20 10:59pm

auldfart
Centurion Member
Registered: 2019-03-03
Posts: 144
Offline

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

I remember having this problem in the past as well, and used a speedi-sleeve for damaged shaft seal surfaces. I had plastic shims as well, but the speedi sleeve being stainless steel seemed to last.

Sorta had this issue this weekend, finding a seat post to fit the '11 Haro I just bought. The original seat and post had to go, but all I could find was a heavy chrome plated steel post that fit (1"/25.4mm), so I used it. No shims anymore, long gone, so no chro-mo or aluminum seat post for the Haro for now. tongue

Never didthe pop can thing on a seat post, but have used it for shim stock on other projects. You can also buy brass shim stock in almost any thickness if you want to go that route.

Offline

 

#110 2019-11-01 5:31pm

eric12
Pro MemberNI4NI
From: M'Boro, TN
Registered: 2012-10-09
Posts: 18742
Offline

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

stonie wrote:

Discuss       smile

It's "too" small. bump


You can't put a price on peace of mind.

This too shall pass.

The world went and got itself in a big damn hurry.

Offline

 

#111 2019-11-15 7:44am

lmach
Pro Member
From: Massachusetts
Registered: 2017-12-19
Posts: 247
Bikes: 7
For Sale: 2
Offline

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

Was wondering if a thick powdercoating would get a 22.2 mm post up near 22.6 mm.  I know - 1/2-ass way of doing it, but that's me sometimes! lol

Offline

 

#112 2019-11-15 7:52am

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

eric12 wrote:

stonie wrote:

Discuss       smile

It's "too" small. bump

No, IT'S NOT.  tongue


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/

Offline

 

#113 2019-11-15 7:54am

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

If ya need a very decent 22.6 post check my Beta listings
Pulled from a 1985ish Mongoose Expert

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/17782/mongoose-expert-22.6-seatpost-chrome.....15dceca11af.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/17782/mongoose-expert-22.6-seatpost-chrome.....25dceca1556.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/17782/mongoose-expert-22.6-seatpost-chrome.....35dceca1314.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/17782/mongoose-expert-22.6-seatpost-chrome.....45dceca1740.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/17782/mongoose-expert-22.6-seatpost-chrome.....55dceca1012.jpg

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/17782/mongoose-expert-22.6-seatpost-chrome.....65dceca30a3.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/17782/mongoose-expert-22.6-seatpost-chrome.....75dceca337a.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/

Offline

 

#114 2019-11-15 12:42pm

cyclepathic
Pro Member
From: Salinas California
Registered: 2018-10-26
Posts: 580
For Sale: 1
Offline

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

My 95 predator cruiser was a 22.4 or .6, I don't remember exact size for certain.

Offline

 

#115 2019-11-15 8:24pm

1979
Pro Member
From: PA
Registered: 2008-03-20
Posts: 1576
Bikes: 6
For Sale: 1
Offline

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

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/13482/20191115_2307165dcf77aceb.jpg
Old  22.6 fluted I yanked out of a 22.2?  That was pounded in. Cracked the keyhole/seatube out instead of in lol. Once bought a new gold fluted sold as 22.2 but was marked 22.5. Never used it. Anyway buy a guage when in doubt. Even a cheapo can be worth it.


It's yours. Do what you want with it smile

Offline

 

#116 2019-12-11 4:09am

STAY RAD
Pro Member
From: Marietta, GA
Registered: 2008-10-21
Posts: 1660
Bikes: 2
For Sale: 7
Website
Offline

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

Ohsh.

85 Mach One. 22.2 post with shim.

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/21924/img_38945df0dc76d2.jpg



---


#smallairbmx / #stayradbmx IG: @stay_rad_bmx
my life story: http://bmxmuseum.com/forums/viewtopic.php?id=693756

Offline

 

#117 2019-12-12 8:08pm

Indyjps
Pro Member
From: Chicago
Registered: 2016-09-07
Posts: 3104
Bikes: 23
For Sale: 4
Offline

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

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/236303/20190217_1045375df30e3cd8.jpg

Took a road bike post, cut the tube off, these have a plug glied into the post,  hand ground the plug to fit inside diameter of 22.2 aluminum tube, had a friend tig it up.


MTNBKSUK

Location: Chicago Burbs

Offline

 

#118 2019-12-13 3:49am

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

Indyjps wrote:

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-image … 0e3cd8.jpg

Took a road bike post, cut the tube off, these have a plug glied into the post,  hand ground the plug to fit inside diameter of 22.2 aluminum tube, had a friend tig it up.

Cool fab work.

But how does this relate to the thread?


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/

Offline

 

#119 2021-06-02 12:29pm

MaximRecoil
Centurion Member
Registered: 2020-09-17
Posts: 179
Offline

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

My 1984 Mongoose Californian frame takes a 22.6mm seat post. I can use a standard 7/8" (22.2mm) seat post in it, but it squeezes the keyhole split all the way closed by the time it's tight enough to not move. Right now I'm using a double layer of aluminum from a soda can. Each layer is about 0.1mm thick, so two layers brings the seat post diameter up to about 22.6mm, and that's perfect. The seat post slides in snugly, but not so snug that you have to use much force to get it in (instead of just dropping in at the rate of freefall without the shim) and when the seat post clamp is tightened there's still a gap in the keyhole slit.

Also, I just contacted a company I found online that makes solid aluminum (6061-T6) seat posts, and takes custom orders. Since I'm using a laid back seat post, I suspect that aluminum tubing would end up bending, but maybe solid aluminum won't. As for weight, according to an online metal weight calculator it would weigh almost exactly the same as my current Nitto SP-8 seat post:

- 450mm long, 22.2mm diameter, 0.0875" wall thickness, 4130 chromoly steel tube = 1.0815 lbs.

- 450mm long, 22.6mm diameter solid 6061 aluminum rod = 1.079 lbs.

Offline

 

#120 2021-06-04 1:43pm

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

MaximRecoil wrote:

My 1984 Mongoose Californian frame takes a 22.6mm seat post. I can use a standard 7/8" (22.2mm) seat post in it, but it squeezes the keyhole split all the way closed by the time it's tight enough to not move. Right now I'm using a double layer of aluminum from a soda can. Each layer is about 0.1mm thick, so two layers brings the seat post diameter up to about 22.6mm, and that's perfect. The seat post slides in snugly, but not so snug that you have to use much force to get it in (instead of just dropping in at the rate of freefall without the shim) and when the seat post clamp is tightened there's still a gap in the keyhole slit.

Also, I just contacted a company I found online that makes solid aluminum (6061-T6) seat posts, and takes custom orders. Since I'm using a laid back seat post, I suspect that aluminum tubing would end up bending, but maybe solid aluminum won't. As for weight, according to an online metal weight calculator it would weigh almost exactly the same as my current Nitto SP-8 seat post:

- 450mm long, 22.2mm diameter, 0.0875" wall thickness, 4130 chromoly steel tube = 1.0815 lbs.

- 450mm long, 22.6mm diameter solid 6061 aluminum rod = 1.079 lbs.

Do you have a web link for this company?     smile


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/

Offline

 

#121 2021-06-04 9:55pm

MaximRecoil
Centurion Member
Registered: 2020-09-17
Posts: 179
Offline

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

stonie wrote:

Do you have a web link for this company?     smile

https://www.santabarbaracruisers.com/seatposts

In my first email I asked if they could make a 22.6mm diameter seat post and they said yes. Then I sent them all the specifications I wanted and asked for a price estimate but I haven't heard back from them yet. I may call them on the phone if I don't hear back, since that's what their site says to do for custom orders.

Offline

 

#122 2021-06-06 5:20pm

stonie
Pro MemberThe Museum Therapist
From: PNW, Lower 48 USA
Registered: 2008-07-16
Posts: 12302
Bikes: 2
For Sale: 14
Website
Offline

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

MaximRecoil wrote:

stonie wrote:

Do you have a web link for this company?     smile

https://www.santabarbaracruisers.com/seatposts

In my first email I asked if they could make a 22.6mm diameter seat post and they said yes. Then I sent them all the specifications I wanted and asked for a price estimate but I haven't heard back from them yet. I may call them on the phone if I don't hear back, since that's what their site says to do for custom orders.

Wow, those are some really cool cruisers and creations   yikes
Rad!     cool


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/

Offline

 

#123 2021-06-28 2:12pm

Flapper
Pro Member
From: Long Island
Registered: 2014-10-09
Posts: 1038
Offline

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

Cromo my seat tubes have thinner walls. Seat clamp is made to fit outer diameter of steel and cromo. Therefore cromoly seat tubes need a slightly larger than 22.2  post to fit properly. Usually 22.5 or 22.6. My looptail mongoose all take 22.6. My 82 GT takes 22.5 to fit correctly.

Offline

 

#124 2021-06-28 3:36pm

Crashman
ModeratorTo Get Me Riled
From: Mount Pleasant, MI
Registered: 2012-04-22
Posts: 8295
Bikes: 2
For Sale: 3
Offline

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

Flapper wrote:

Cromo my seat tubes have thinner walls. Seat clamp is made to fit outer diameter of steel and cromo. Therefore cromoly seat tubes need a slightly larger than 22.2  post to fit properly. Usually 22.5 or 22.6. My looptail mongoose all take 22.6. My 82 GT takes 22.5 to fit correctly.

We already had the discussion about companies using thinner walled Cro-Mo to make the frames lighter. It's not like 0.062" wall 1" tubes weren't available in Cro-Mo, just that many companies chose something thinner. But thanks for the reminder


Wanted: OPC shells for 6005 bearings (47mm)

Offline

 

#125 2021-07-01 1:29pm

Flapper
Pro Member
From: Long Island
Registered: 2014-10-09
Posts: 1038
Offline

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

Crashman wrote:

Flapper wrote:

Cromo my seat tubes have thinner walls. Seat clamp is made to fit outer diameter of steel and cromo. Therefore cromoly seat tubes need a slightly larger than 22.2  post to fit properly. Usually 22.5 or 22.6. My looptail mongoose all take 22.6. My 82 GT takes 22.5 to fit correctly.

We already had the discussion about companies using thinner walled Cro-Mo to make the frames lighter. It's not like 0.062" wall 1" tubes weren't available in Cro-Mo, just that many companies chose something thinner. But thanks for the reminder

Sorry about that. I missed it reading through the post. Also didn’t realize how many GTs had this same issue as me.

Offline

 

Board footer