Basher RZ-4 1/10 Rally Racer - Correction Poulie 20T (2pc)
Again with HK's description. Very confusing but the product is quite durable. Only buying these to replace the ones I have after I trashed the crap out of it.
Where does this belong? Well you have to gear bits which sits either side of the spur gear. These pulleys have a belt that drives the front (left side as looking from the front) drive and the back drive (right side as looking from the front) system. If you are only using your RZ-4 on sealed road they you wouldn't have to replace this part but if you're like me and take it off road (as it should be) then having spares of these is highly recommended. Make sure you also get the drive belt while you're at it.