Sorry to hijack your post, but I am pondering brake upgrade options for my 2008 XL883 also. Yes I have read info that I could easily find on this forum already.
Seems not much is directly compatible as a bolt on for Sportys with 21" wire wheels.
Is anyone aware of a 4piston caliper that's a direct bolt on to suit wire wheels?
I've been considering the XR1200 caliper option which everyone recommends, not sure if HD still stock these, but I understand that these still have clearance issues and my need some machining to fit...is this possible and would it affect the structural integrity of the caliper?
Other option is the Vrod Brembo, but involves new rotor, is there still clearance issues with wire wheels with this brake?
Thanks anyone for you advice...