Headset Modification.

[stephan]

Folks,

Anyone tried to internally lathe the threads out a 1 1/8" or 1 1/4" threaded headset top bearing cup to make it a threadless set?

Just curious!

 

[bobby-gg]

Folks,

Anyone tried to internally lathe the threads out a 1 1/8" or 1 1/4" threaded headset top bearing cup to make it a threadless set?

Just curious!

No, but it's something I'd do.

Only problem would be it would end up just a straight fit, as opposed to most aheadsets having a taper design to lock it down, but, you could easily machine that in, if the top cup had enough meat in to machine

 

[stephan]

No, but it's something I'd do.

Only problem would be it would end up just a straight fit, as opposed to most aheadsets having a taper design to lock it down, but, you could easily machine that in, if the top cup had enough meat in to machine

I see, just checked! The threadless does have a tapered cup that sits "wedges" into the top bearing cup, to keep in central under tension.

 

[Twozaskars]

Chris King is one that comes to mind, no ‘wedge’ in there just a very close fit.

 

[stephan]

Chris King is one that comes to mind, no ‘wedge’ in there just a very close fit.

Ah! - My guess even a thousdanth of an inch off (cup size), under tension the bearings would just be rough. I wonder if Chris King's bearings also have something to do with why they do not need that "wedge" as they kinda "lock" together with precision.

 

[Twozaskars]

I’m just thinking of play between the headset and steerer, rather than within the bearing itself.

 

[stephan]

I’m just thinking of play between the headset and steerer, rather than within the bearing itself.

Gotcha - so the wedge compressed would stop any play, Chris King are / were bold to produce such tolerances, my guess some fork steerers etc are way out of tolerance.

 

[ishaw]

I have an adapter for such a thing and it was done in the past. No need for it, bought it a while back as a 1 inch option but I think it was for 1 1/8. I can dig it out and post pics if anyone's interested.

 

[stephan]

I have an adapter for such a thing and it was done in the past. No need for it, bought it a while back as a 1 inch option but I think it was for 1 1/8. I can dig it out and post pics if anyone's interested.

Cheers @ishaw - no rush for the pictures, curious however what this looks like. ta

 

[Mace4130]

I have done this to a 1” Shimano 600 headset, it has been like it for 10 years now.