As far as performance is concerned, close ratio gears allow the rider to use the motor properly. I have only raced in later years using 4 speed close boxes. With my 500cc Triton, I never lowered the overall gearing, except on one occasion when I was frustrated. I have never had close ratios on a road bike. I would probably either hit a car or get booked. I would dearly love to race my Seeley 850 with the 6 speed TTI box, with the 4 speed Manx cluster in the Norton box, it was excellent everywhere except in a clutch start - a bit too slow at the beginning of races. Modern motorcycles usually have 6 speed gearboxes, they are probably too fast. Is riding on public roads about speed ? If your mates all ride old British bikes, you might make them look silly.