This bit posted by Broke_as_**** on October 24, 2012 at 08:38 PM
Message
in the pic. OD = outside diameter is 230mm. Not sure on the ID measurement. I have used this webpage before: [ http://www.autotechdriveline.com/q_diff_applist.shtml ] It unfortunately doesn't list the ID for the R230 but it does references this company: [ http://www.horsepowerfreaks.com/ ] Perhaps they may be able to assist you with this measurement and any other questions you might have. Hope this helps.