Lower headset 1.5 -> 1.8" conversion

JAMAN

New Member
Apr 22, 2024
15
16
Finland
Did a mistake and bought a fork with 1.8" steerer tube. Trek Rail takes 1.5" steerer tube inside. I couldn´t find conversion cups in market so I designed and builded conversion cup myself. This lifts front 13mm but hey, it works! Here are the results:

valmis_kuppi2.jpg valmis_kuppi1.jpg fin_fit1.jpg fin_fit2.jpg fin_trek.jpg fin_zeb.jpg
 

bart594

New Member
Jan 13, 2024
7
9
Poland
Nice!
Can you share stl/step file? I bought fork with 1.8" steerer tube too
I was not aware that we have one more "standard"....
 

Munch90

New Member
Aug 20, 2024
1
1
United Kingdom
i have gone and done the same thing and this seems like my only soloution right now any chance i could get the CAD file also i would rerally appreciate it
 
Last edited:

Michelna

New Member
Aug 24, 2024
1
1
London
Did the same mistake, bought a 1.8 for a trek.
@JAMAN how is your converter performing, any extra stresses on the headtube weld?
Would it be possible to share the cad?
 

JAMAN

New Member
Apr 22, 2024
15
16
Finland
Sure, I'll send the CAD in private message.

I used blue locktight when I assembled the conversion cup. It sticked well to the original cup. Mainly I go for rocky, technical downhill enduro tracks, so I think I've had tested this conversion cup pretty well. So far everything is perfect, no problems with the frame. And this 1.8" steerer tube gives extra stability!
 

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