Review on RioRandTM Upgraded 6V 90V Motor Controller by Richard Gross

I bought 2 for my RV. My RY uses 3 speed home fans. I installed them and bypassed the original 3 speed derailleur. Now I have full control over the speed. It goes from slow scanning to high speed and everywhere in between. I can only recommend these controllers. They are easy to install and work fantastic. Fans use less power at lower speeds because they are electronically controlled rather than speed controlled resistors. The fit is tight, but that's not a problem. Just think ahead when installing them.