Installed today. Was mot a drop in fit. Outer cover had to be ground slightly. RPMs greatly reduced at 70mph. When running 80 to 85 I still think it seems I am passing people closer to 70 or 75. So not sure on correction of speedo. Big loss in take off torque. My classic doesn't have much of that to begin with but much less of it now after the pulley swap. Stock pulley going back on and taking this money and putting on commander IIs instead. Looks the pulley will be going to the classifieds.