Over on the other side of the pond, there's been some forum discussion about what discs to use for a twin disc CR/CB750 conversion. I've replaced mine with custom discs grafted onto the CB750 rotor centres. The discs are made from 290mm diameter, 4mm thick cast iron and the old CB750 discs are taken in, refurbished and have these lovely rotors grafted on. The cast iron is treated with a zinc preparation to assist in corrosion protection for the unswept areas of the rotor and they stay mighty good for the life of the disc if my experiences on the Black Bomber racer are anything to go by.
The work is all done by CAT Engineering in the UK - it's not the cheapest way to do this but it gives one finger stopping power which is great for racing. So, especially for Voxhonda, here's a pic of the discs I'll soon be fitting to my CR750 replica front end, well, soonish
