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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  More seatpost woes! Is there another sizes besides 7/8ths and 13/16th?
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Author Topic: More seatpost woes! Is there another sizes besides 7/8ths and 13/16th?  (Read 2609 times)

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Offline oldschoolace

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This fookin vitus has me stumped lads. After finding a glassfibre post lodged in the bottom of it the other day I gave the seat mast a good scrub and a going with a tube honer. Clean as a whistle now.  :daumenhoch:

tried the cleaned up Gt post back in it today and it was still tighter than you would expect and wouldn't go much further past the keyhole slot.

I assumed as its French double butted tubing and that it has a glassfibre post lodged in it that it probably needs a 13/16th post but I reckon if I took the 1.6mm difference off the gt post it would rattle around in there like a Biro in a hooker  :-\

Is there another size im unaware of or is it deffo 13/16 or 7/8th
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Gnarlyscoots

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13/16 or 7/8th
Is that 20.6 (21) and 22.2 mm yes  :whistle:
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Offline oldschoolace

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Yep that's right for you younger kids  :LolLolLolLol:
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Gnarlyscoots

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Yep that's right for you younger kids  :LolLolLolLol:
;D

I think I am right, I may be just b**********g but, didn't GT make their posts different sizes, chrome and painted? If you remove the paint from a GT post it is slightly smaller than a chrome post. I think it was GT anyhow  :-\
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Offline glenboy

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Yep there's 22.8 as well

Offline Gnarlyscoots

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Yep there's 22.8 as well
I think Clint means a post size in between 13/16 and 7/8 Glen  :)
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Offline oldschoolace

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I did wonder if the post was an oddball size Terry but I measured it with my digital calipers and was Bob on 22.2mm
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline glenboy

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Ah got it terry and yes  some gt  posts are 22.6mm for some weird reason so maybe you have one of them Clint

Offline glenboy

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Easiest way if not is use a alloy or fluted alloy post and just sand it and polish it down a bit

Offline Bigfrawg

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Or smash the coont in with a hammer

Offline snoopy72

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Shine a touch down the seat mast tube and make sure the weld from the top tube hasn't penetrated into the seat mast tube , I have had this before with a mongoose frame, once I carefully removed this tiny bump the seat post fitted perfectly all the way down the frame.

Offline oldschoolace

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Seat mast is clean as a whistle. Doubled checked my measurements and the mast is 25.4mm diameter with a 1.6mm wall which would mean it should take a 22.2mm post  :-\

Gt post is deffo 22.2mm and its deffo round with no obvious dents, marks, anything that may make it a tight fit.
Really dont want to knock it in with a hammer  :-\

Might just find a 20.6 post and shim it with a pop can if need be
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline bobbbbsy

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clint we all use mm these days .  :LolLolLolLol:

the euros used it long before us to .

Offline CustardLips

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Make a wooden one Clint.  :daumenhoch:
Then polish it to a mirror finish... no-one'll know.  :D
"Every year is getting shorter, never seem to find the time"

"WWG1WGA"

Offline chubby

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Still here if you need it chum 😊
WANTED : 1" freestyle forks, uglier the better

Offline oldschoolace

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Hey Hey almost forgot that beauty  :smitten:
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline chubby

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Hey Hey almost forgot that beauty  :smitten:

Just say the word  :teef:
WANTED : 1" freestyle forks, uglier the better

griff

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Still here if you need it chum 😊

Fooking lol
There it is again

That reminds me, we need to have a think about sacrifices for the MK fire gods

Offline oldschoolace

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NOOOOO! im half way through a display cabinet for this gem  :-X
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline chubby

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Don't worry, Griff threatened to burn it last year too
WANTED : 1" freestyle forks, uglier the better

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  More seatpost woes! Is there another sizes besides 7/8ths and 13/16th?
 

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