So it can fit on MTB hubs which didn't get the wider freehubs at 11 speed because the sprockets for 11-12 speed are big enough that they can start to overhang the flange inboard
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."