-
Hope Stepdown.
Winstanleys says they're in stock...
(still quite pricey as you have to buy each bit individually).
Or a reducer crown.
@hugo7 - if you're in London I probably have one you can have for free. -
You can get head tube shims to enable using a 1 1/8 headset and forks, I used them on an old alpine stars frame.
https://www.sjscycles.co.uk/headsets/1-14-to-1-18-inch-headset-reducers-alloy-black/
I have a cannondale M1000 which I realised too late takes a 1 1/4 headset.. I would like to use 1 1/8 Threadless forks .. what is my best headset option for this please. I believe King devolution might perform the task but my budget is more in the ratbike bracket