6-9/16"" from the bottom inner race to the bottom of the knurled adjuster nut just below the top clamp. which If I can tell wraps down past the top of the inner race. My best guess would be 6.75" allowing 1/16" for the metal thickness of the silver knurled nut. R100GS front end on a G/S frame. Does this give you what you need?? Not sure how far the race goes into the silver ring, guessing the top of the ring is <1/16" thick...something like that.