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Crank Bros Iodine
Some people have questioned the utility of Crank Bros DirectSet headsets. Mine doesn't get anywhere near enough abuse for me to form a view, but the fact that Crank Bros have completely pulled out of the headset market would suggest that they were failing to impress compared with the established competition. On the one hand, that was good for me as I got mine in a sale at about ⅓ of rrp, on the other it's a shame as I quite like the basic idea, but they clearly couldn't get it to fly in competition with headsets built with separate cups and bearings.
Why do you want a lower stack height? Fork steerer too short? The lowest total stack on a standard 1 1/8", as far as I'm aware, is a Crank Bros Iodine. It's about 20mm (compared to 31.4mm for a chris king, for example).