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Old 05-25-22, 02:17 PM
Join Date: Sep 2019
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Bikes: Holdsworth 1979 Special, C-dale 1993 MT3000 Tandem & 1996 F700CAD3, Cervelo 2022 R5 & 2018 R3, JustGo Runt, Ridley Oval, Kickr Bike 8-)

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Thanks for all the help... I've got my answer.

Micro Spline hub = MTB only (no compatibility with other cassette standards)
New Hyperglide hub (HG) = Road and will accept an original HG cassette (11 or 12 speed) or a New Hyperglide cassette, 11 or 12 speed. (no Micro Spline compatibility)

The longer Version
Micro Spline is for MTB only. It permits the use of a 10T smallest cog.
However there is no compatibility with other cassette standards.

The older standard, "Hyperglide" relies on 9 teeth on the hub (8 large, 1 small) to stop the cassette from spinning.
I'm now seeing this standard referred to as "HG11"
Problem was that the usually steel cassette would cut into these 9 hub teeth if the hub was alloy and not steel.

In order to fix this issue you need more teeth to spread the load on an alloy hub teeth.

Time for a new standard, I'm seeing it called HG12.

By cutting the 8 large HG11 teeth in half you get 17 teeth total and can spread the load, ideal for an alloy hub body.
Better yet, because they left the teeth at their previous HG11 spacing, regular HG11 cassettes fit, regardless of if they happen to be 11 or 12 speed.
HG11 cassettes just engage with the original 9 teeth of HG11.
But if you happen to have a HG12 cassette, it can make use of all 17 HG12 teeth.

I got there in the end.

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