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You need a little more than 4.5 backspacing rear rims when running the pre 63-67 width rears. Unless you are running real narrow tires.

The 11x3 aren't neccessary and just weigh things down.

Just get a the right pin or slider caliper adapter to get to 11.75 disks



That isn't on the spindle?



the spindle is the same between the 2 brake sizes , the caliper adaptor unbolts from the spindle and thats the difference between the 2 , uses the same caliper .