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The on-one smoothie has lasted for six months of 'summer' before being a gritty thing of extreme gritness. Who makes a fit-and-forget headset with a cup to convert 1.5 to 1 1/8?
Hope?
Chris King is the obvious. Then get a separate spacer to sort out the converter.
That's good going for a Smoothie, mine went ropey after under a month.
There might be more good options now but Hope had it sewn up last time I needed a reducer.
Hope is nice but check the stack height, it may be a lot less than you want.
Hope fitted and forgotten years ago
Do Hope do a +10 for your exact needs? I had one for a full-fat 1.5 head-tube, they offered it in zero stack and 10mm stack.