Pro class problem

[Foxxy]

Hello everyone. Hope someone can help me?

I'm building an 83 supergoose and I bought a pro class ACS stem yesterday which won't go into my forks because its too big. The figures of 22 83 are inscribed in the stem (which I assume means 22mm made in 1983?) and when I measured the internal diameter of the forks they were 20mm.

I thought pro class parts would fit mongoose/supergoose forks/frames? I assumed the forks were the original supergoose ones but maybe they are not now.
Can anyone explain what my forks are likely to be then and therefore what stem I should be looking for.

Appreciate any advice you may have.

Thanks Foxxy.

[animal]

This occurs from time 2 time  The smaller 20mm is a metric stem the other is a 7/8th imperial shaft. looks like stems of all sorts were made in 2 sizes 2 suit different forks depending on manufacturer . Hazzard of the hobby I'm affraid  I have smaller 20mm stems fitted in 7/8th forks , it just means they creak and move  but the other way doesn't work obviously 

[daz bmx it!]

Hazzard of the hobby!  you heard it here first

[Peter J]

Best person to ask is Bobafett 


He's the goose god on here 

[bobafett]

Post some pictures up of your frame n forks 

[Foxxy]

Thanks Bobafet. Here are some photos. Hope they are clear enough.

[bobafett]

Well you've got non-gusset era forks on a gusset era frame for starters mate, they deffo ain't supergoose forks (supergoose forks are 7/8" not 1" tube) those forks are probably off an 83-85 californian/expert - should all still fit together though. Does that head lock tighten down ? or is that how it sits in the piccy ? Not had that type of headset on any of my geese so can't comment on any issues with that. As for your ACS stem not fitting have you tried removing that headlock and checking that the stem slides in to the fork tube without it ? Maybe it's the headlock  Can't see any reason why an ACS stem wouldn't fit those forks.

Maybe it's the wedge ?

I'd remove the headlock, and the wedge and bolt and then just see if the stem shaft will fit into the fork tube on it's own for starters mate 

[hunterdubber]

Well you've got non-gusset era forks on a gusset era frame for starters mate, they deffo ain't supergoose forks (supergoose forks are 7/8" not 1" tube) those forks are probably off an 83-85 californian/expert - should all still fit together though. Does that head lock tighten down ? or is that how it sits in the piccy ? Not had that type of headset on any of my geese so can't comment on any issues with that. As for your ACS stem not fitting have you tried removing that headlock and checking that the stem slides in to the fork tube without it ? Maybe it's the headlock  Can't see any reason why an ACS stem wouldn't fit those forks.

Maybe it's the wedge ?

I'd remove the headlock, and the wedge and bolt and then just see if the stem shaft will fit into the fork tube on it's own for starters mate 

Feck me John thats all exactly what I was thinking as I saw the pics
 
except you've typed your very informative reply a lot better than I would've  done 



Basically ,,,Yeah Foxxy ,,, what he said    

[bobafett]

 

[Foxxy]

Well at least I now know what I've got thanks.

I guess supergoose forks are like rocking horse poopoo(?), so I'll probably have to stick with the ones I've got for now. The suntour headlock nut does go down. And I had already tried what you suggested but the stem simply won't go in. 

The headset came with the frame. Its not marked but works.

Thanks again for your advice.

[bobafett]

I had already tried what you suggested but the stem simply won't go in. 

Well I don't understand mate - it should fit 

Is the inside of the fork tube corroded ? Thick bits of rust etc ? Maybe try rubbing around the inside of the tube with a large round file 

Other than that I just don't know mate, unless the fork tube is squashed 

Does it go in slightly and then stop a bit tight or will it not even start to go in ?

Fook knows 

[Foxxy]

Bobafett,

Success!  Did what you suggested with a file and eventually it went in, so well pleased. Again, thanks for your help.

Foxxy

[bobafett]

 Good stuff 

[diesel]

If its only just going in then you might want to rub a bit of lithium grease around the inside, otherwise it'll all fuse together and you'll never get the bugger out without damaging something.

[dj-paul-c]

you'll never get the bugger out without damaging something.

the damaged part normally ends up my knuckles