Royce, one of our stickshift racers runs a low 10 second VW Beetle, and he said that years ago, roller bearing cranks were semi popular with the faster VW racers back then, but not anymore, as there was no performance benefit, the cost was considerably higher, and maintainance was a real hassle, . Not to mention you would think that having to separate and press the crankshaft back together, that the press fit would diminish after repeated disassemblies.