I started out with the front brakes. I had decided early on that I wanted twin brakes since it just looks a lot better with two than a single sided job. It took me a while to get my front fork supplier to understand that I needed to know how the Brembo F08 brake cylinders were going to be fitted to the front fork sliders and therewith what the distance between the brake discs’ business ends was going to be. Knowing that I pulled up the front wheel drawing to see what the width was of the front hub and now I was ready to “design” the discs.
I Googled quite a bit but could only find disc suppliers catering for the aftermarket of established brands/models. Nobody is listing a brand called Seeley MkII so I was starting to despair until it struck me that there is a guy in Sweden called Acke Rising who in his company ISR Brakes is doing exactly what I needed. Acke makes brake components in all sorts of shapes and his website has a form where you can just fill in the dimensions you want and mail off to him ( if you have his email address ).
Acke was born in 1947 and is not a believer in getting bombarded with emails so he keeps the address away from his website. However, there is a phone number so he can be reached and if he smells business he will give you his email address.
He quickly assigned a part number to my discs and here is what they look like: Outer diameter = 280 mm and disc thickness 5 mm.
Hitting these brakes should be like throwing out an anchor around a roadside tree.