Aluminium Idler - Do I need this

[GriMM]

I always thought so too, and its got 32 pitch gears which oughta be a little more resistant to slipping - but when I put it in reverse to climb over things that are tough and strain the drivetrain i hear it click sometimes. It also tends to be driving forward at speed then slam into the brakes, causing the same thing and flipping the whole rig over a few times. (but thats probably the radio system)