1 inch to 1 1/8 frame adapters

ishaw

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GT Fan
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Came across this post a while back. Seems to promise the ability of using 1 1/8 forks on old 1 inch steerer tube frames.

No use to me as I no longer have any frames in that size, but thought it might be of use to others struggling to find decent forks for their old frames.

 

Magpiegifts

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Kona Fan
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I'm no expert as you all well know by now 😉
But how do you get a 1.125" steerer in a 1" headtube!?! Or is that not what you are saying Ian, I'm leaving myself open to lots of abuse here aren't I!lol
 

ishaw

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Thats what the ad suggests. You can slot a 1 1/8 steerer into a 1inch head tube, not sure how much clearance there would be left for headset cups though.
 

FluffyChicken

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Retrobike Rider
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30.2mm for inner headtube diameter (1")

28.6mm steerer. Diameter and crown rance 30.0 for 1 1/8

0.8mm either side of the tube.

So a 1/2 mm thick shim to sit cups or bearing in?

I see an amazing lack of detail and pictures
 

FluffyChicken

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Yep, if you've ever used the 1/4 to 1/8 reducers, they're a bit flimsy to get out in one piece and are 1.5mm thick.

Dread to think what a 0.5mm bearing and headset holding one will be like.

I suppose it could cup over the tube, but it would certainly need to be custom made to fit.
 

Bcxbcx

Orange 🍊 Fan
I've often wondered about this, but never seen anything available. I have a MTB with a 44mm head tube and have had 1.5", tapered, and straight 1 1/8" forks on it over the years. But that's 44mm, so lots of room to play with.
 
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