That depends on the brand and size of motor you're running.
Good point
Im running a MMM2200 combo with the losi mount. I'll would get the rc-monster mount but i wasnt to thrilled with their mount for the revo. It kept coming loose, hopefully the losi works better!
Any links? I ask cause I read a guy say he only uses metal spurs and such so I was wondering where can i go to look for "quality" gears or is there no need to worry. Im a spur stripper so metal gears do entice me!