Why do people think they need instant access to the rear brake rotors by mounting them outside the axle flange? Maybe for pro-racing.... It complicates caliper mounting, e-brake positioning and requires longer brake flex hoses, cables etc. The only street advantage I see is, the wheel studs cut their anti-rotation splines in the steel axle flange instead of the aluminum hat-flange.
Along with David Nunn's comments, also consider that some of the current aftermarket outer stub axles seem to have stronger, thicker flanges. And since the stub axles were designed as a drop-in replacement for stock hollow axles, any extra flange thickness may be toward the outside so stock rotors mount at the stock position inside. It's maybe only a little extra but it seems we're pushing the unflared stock body limits with 10" Campys and 295-50s x 15" already.
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