My EZ8 is built on a 2000 dmd Sherman with white gear tranys. The ilder has no problem at all. And I ran the **** out of it. The old bogies however are shot. The old wheels rolling on the cast axles have the hubs wearing upward into the wheels. The tank squeaks really bad now. I have a set of modern bogies to install and rebuild Katy Cat that are left from the hull I cut up to make my M50. More or less, saying the Tamiya idler is not an issue. in a relative time frame of wear.