The blocks on my N6.0 have 75mm (3 inch) sheeves. Since I use a 3/8" mainsheet, though, I can get away with the 57mm sheeves on the ratchamatic. I'm curious as to any negative tradeoffs by going to smaller sheeves (other than being limited to a smaller line size for the sheets).

I'm also really interested in the performance of 57mm carbo ratchamatics for the jib blocks. Anyone use them?