Alloy welding and low stack headset questions

[jez-4-bikes-max]

Could be true Pete - magnet test when I get in!

This looks to be the very expensive grip nut I'll need

https://www.ebay.co.uk/itm/NEW-Chris-Ki ... fresh=true

 

[jez-4-bikes-max]

It's steel!

Plus it does look to be press fitted and epoxied in - spot on guys.

So...the options are now a little more flexible. I assume I need to find someone to unbond and insert a new 1 1/4 steel one.

 

[Haaland]

If the CK fits that would be the easiest and cheapest I guess.

Steel is always real

 

[danson67]

Re:

You'll have to looking the Manitou and Pace bins for a 31.8mm threaded steered.
They're not available from the tube suppliers anymore, specially threaded.
The cost of having one made (internally butted with external thread 4130) would be more than the CK Gripnut solution.

All the best,

 

[jez-4-bikes-max]

Got a replacement steerer (and a titanium one infact) so it's just working out how easy it would be to remove the existing and replace it with the new one without killing the fork.

The other solution is to find a very low stack lower cup (off a modern bike) and that will gain me a little more space. Anyone know of any lower cups designs that would be as slim as possible.

 

[focomat 1c]

Re:

A press fit ( or an interference fit ) is where a shaft is larger than the hole it is
going into . The greater the difference ,then the greater the friction obtained
between the two components

There is therefore no room for any epoxy resin between the two components
of a press fit

In this case you need to heat the existing resin filled joint . A hot air gun should be ok ,
the resin will be weakened enough for you to force the steerer tube out of the
fork crown using a mallet and protective wooden blocks

Clean the components to be bonded , apply resin to the joint , and insert the steerer

Be careful, since the resin is also filling the gap between the two components
This means there is some 'slop' in the fit

You will therefore need to make some sort of jig/fixture to hold the two parts in their
correct relationship before you start ,to ensure correct steering geometry

Hope this helps