Low cost 850 MK3 brake up grade.

It's not clear what you have done. It looks like an over-size RGM disc, with a special bracket to match the standard caliper to it. Have you fitted a sleeve kit to reduce the front master cylinder diameter, and a small diameter rear master cylinder? If this is the case, I can imagine a big improvement in stopping power

Paul

Hi Katherine -- can you tell us how you adapted the Suzuki disc to the hub?

Previously Katherine Scott wrote:

It is an oversize disc not from RGM, it's from a Suzuki bandit 400, the front master cylinder is 1/2 bore as is the rear cylinder.

Regards

Katherine

Thanks for this clear description -- a pretty easy job for anyone able to access a lathe to make the spacer.

Previously Katherine Scott wrote:

Hi Julian

The hole in the centre of the Suzuki disc is larger than the Norton hub, and the 5 mounting stud holes are too large and too far from the centre, however the offset of the disc to the hub is very close to the original Norton disc.

If you take a look at the first photo, you will see a 110mm od aluminium disc, the back of which is machined to give a 3.9mm protruding step that pushes into the centre of the Suzuki disc. The centre of the stepped spacer is bored to match the Norton hub. Now for the five mounting holes, I pushed the stepped spacer in to the Suzuki disc placed the Norton disc on top making sure that the mounting holes were aligned in-between the original holes on the Suzuki disc. I turned up a mandrill and clamped the disc and spacer stack together, I then drilled through the five holes in the Norton disc. The Suzuki disc ends up with ten mounting holes but the is plenty of metal surrounding each and the spacer covers the unused holes.

Best regards

Katherine