This isn't true with the Dr Diff rear set up. You can run the tapered rear bearing.
I have Dr Diff's 13" front, 11.6" rear and 15/16 master and I have no issue with getting a firm pedal.
To the OP. Do avoid the generic, cheap, rear disc brakes you see from other sellers like Right stuff, MP, etc. Stick to Baer, Dr. Diff, or Wilwood. I suggest a call to Cass (Dr. Diff), you'll be glad you did.
