On Thursday, October 12, 2017 at 4:04:07 AM UTC+1, Tim McNamara wrote:
On Wed, 11 Oct 2017 18:16:20 -0700 (PDT), jbeattie
wrote:
On Wednesday, October 11, 2017 at 2:36:03 PM UTC-7, Joerg wrote:
The adapters to increase rotor size in a post-post situation (which I
have front and back) look like this:

If you keep following that logic, you'll have a disc diameter of 622 mm.

Oh, wait....

I already have a brake disc diameter of 622mm. You could too. First, buy a bike with standard 622mm rims. Next, fit Magura hydraulic rim brakes (several varieties available for touring, utility and road bikes). Result, powerful but very manageable 622mm disc brakes, economical on "pads" too. Hey presto, your brakes are powerful enough to ride with Joerg.

Andre Jute
Logic is good, but common sense is essential