I've been bringing a 74 750 Four back to life. it cam with a 18" Lester mag on the rear, after a sprocket bearing wiped out basically all the wheel bearing's I decided to get a replacement wheel instead of waiting on someone to fix the one I had. When the wheel I ordered arrived, it turned out to be a 16" Lester. I was concerned at first, but only until I took the first ride with the 16. It completely transformed my bike, it went from sluggish handling with a poor turning radius, to nimble and light on its feet. Acceleration noticably picked up as well. And it really doesn't rev too much higher at 55+, nothing to be concerned with anyways, oh and it doesn't feel like it's gonna tip over everytime I put it on the kickstand. To everyone with a CB-750 Four that has the stock 18" on the rear, I can't recommend converting to a 16" more. The difference is seriously night and day in favor of the 16".