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what lower stack options are there
You can lower the stack by using a ZS49/30 bottom half, e.g. http://www.evanscycles.com/products/cane-creek/40-series-zs49-bottom-headset-ec026970
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I was thinking more of the upper, as the OO part is 9mm tall, which seems a lot for a "zero"-stack part.
Hadn't considered a different style lower, will have to measure my downtube clearances from the segmented fork. At least the geo's slack enough that it'll probably still be nice a degree or two of steeper!
Update: dt clearance actually plentiful.
My OnOne Fatty has the steel fork with a straight 1 1/8" steerer. I think the headset spec is ZS44/28,6 | EC49/30.
Have already slammed dat stem, but as the headset bearings are rough, what lower stack options are there than the stock OO Smoothie Mixer (which is currently £39.99)?