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I may have read somewhere that the S550 front hub bearing will work on a S197 spindle. I also read somewhere that the S550 bearing is a little more robust than the S197.
I posted this a long time ago on Corner Ponies after ACS murders my front wheel bearing (as a NASCAR turn can) but while at the track Tom (@67GTA) mentioned he;d never heard this.From my original post: Crossed my fingers a bit when i thought the bigger studs might not fit thru the brembo...