99% sure the discs are VFR. They are definately bigger than std NSR. I'm taking the bike into my engineer this week to try and sort a bracket that will correct the positioning of the calipers to suit NSR wheels with VFR discs.

Re. the tripples, I am wondering if the ZXR250 had a slimmer yoke width. The calipers sit too far in (ie the disc sits very close to the outside edge of the caliper). This makes it a bit harder to deal with because it's not as simple as just spacing it further in. Any ideas here?

In fork related news, had the bike on the track today running in the new engine (low speeds and mild braking don't worry) and had the front wash out on me. I naturally blamed it on the fairly lo quality tyre I had on (and maybe a bit me ), but is there there any chance that the fork set up contribted to the slip? Maybe the rebound of the heavier grade fork made it a bit more difficult for it to handle it?