The A2Z adapter is absolute garbage, in my opinion.

If you can still find one, the Woodman “VRX Adapter” is a much better part for this than the A2Z adapter. It is much more precisely made (machined aluminum instead of stamped steel), and does not require a larger rotor. I paid about $30 for mine in 2006.

Here is a photo of the woodman adapter. I will try to remember to take a photo of my rear brake setup and post it here. 

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