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Does such a thing exist?
I can see adaptors that are to allow 1 1/8th steerers to be used in 1.5" headsets, but I have a straight steerered fork and a couple of perfectly serviceable 1 1/8th headsets. I'm considering getting a frame that has a tapered headtube. Is there an adaptor that will allow me to use the former with the latter?
You have to get a lower cup to suit.
Or sometimes you can just get a 1"1/8 to 1.5" crown race adaptor for most typical 45° x 45° bearings
Ah, I should have added that';s a semi-integrated headset, if that makes any difference.
The lower part from this, I guess, possibly...
Edit: semi-integrated? Do you mean it has a zero stack lower cup? I'm confused.
So, does the frame you're looking at have a tapered headtube with a 1.5" lower so you can fit a tapered steerer fork with a lower zero stack set-up - as used by Evil, say - or is it just a standard tapered headtube, in which case the lower is actually 44mm? If you have a zero-stack lower cup with a 1 1/8 steerer, presumably it fits in a 44mm headtube, in which case you'd need a reducer that sleeves down the 1.5" lower headtube to 44mm... erm, I think.
I think I'd maybe just buy a new headset... oh well. Good luck 🙂
The frame:
https://www.planetx.co.uk/i/q/FRPXFMDP/planet-x-the-full-monty-alloy-gravel-frame
Would usually take this fork:
https://www.planetx.co.uk/i/q/FOPXFM/planet-x-the-full-monty-carbon-gravel-fork
However I already have a straight-steerer fork I want to use instead
The headset(s) I have are standard 1 1/8th integrated jobs. Ignore the comment about semi-integrated, I think I was having a brain-fart.
Tapered headtube I assume you mean it's 1.5 bottom and 1 1/8 top.
All you need is a suitable reducer crown race for the fork for the headset.
Planet-X / On-One do one for the Smoothie Mixer headset, turning a 1 1/8 into a 1.5. I had one of these when I had a straight steerer on my C456.
https://www.planetx.co.uk/i/q/HSOOSMCRC/on-one-smoothie-mixer-crown-race
If the bearing angles on the lower headset are typical of Hope, then it may work (as I use the same bearings in the Smoothie as I use in my Hope headsets).
Not an amazing race though. Better would be a Hope race as they have a nice seal on them. Might be able to get one from Hope separate from the headset.
Or, Superstar seem to do a knock off of it...
https://www.superstarcomponents.com/en/crown-race.htm
(pick the reducer option)
Has the split ring design and rubber seal, very like Hope.
That's an integrated headset frame. It doesn't use cups at all. The AC45 bearings sit inside the machined headtube.
What you'd need is a 1.5>1.125 baseplate for an FSA headset.
Right, so, what I think I'm learning is that I can use the top half of my current headset, but not the bottom half.
Instead, I'll need to buy a bearing to sit inside the headtube at the bottom and a crown race reducer to sit on the fork. So something like this:
https://www.superstarcomponents.com/en/crown-race.htm
(reducer option, as above)
and this:
https://www.superstarcomponents.com/en/type-4-headset-bearings-1-5-or-tapered-36x45-degree-x1.htm
Yes?
Bumpety bump.
I'd like to order the bits, am I right in what I think I need above /\ ?
I'd presume the top headset is integrated as well?
If I were you I'd sell the existing forks to someone on the charge plug thread as 1.1/8 disk forks are like hens teeth and buy the matching fork.
And just buy a new headset, CRC have a brand-x integrated headset for £15 which should survive if you pack it with grease.
Can't say for every brand but the hope adapter is a big aluminium top hat that you press on the steerer to make it 1.5" then you press on your 1.5 crown race (in hopes case this is the one with the rubber seal) that comes with the headset onto that.
yes that part seems correct - ie a crown race that sits on your fork at 1 1.8 and then makes the fork actually 1 1/2 to fit- ie a massive crown race
Hope do them as well but will be pricier
If I were you I’d sell the existing forks to someone on the charge plug thread as 1.1/8 disk forks are like hens teeth and buy the matching fork.
And just buy a new headset, CRC have a brand-x integrated headset for £15 which should survive if you pack it with grease.
I'm coming round to this way of thinking...