Arrma 3S BLX HD 0.8MOD Spur Gear (57T)

Giving this a 4 star, should be 5 stars, but here's the thing, it's PROBABLY a sturdy spur gear and WOULD last a while as long as you A)Set your mesh proper B)Don't bend your motor mount C)Find a way not to let dirt into the motor housing which chews up the spur D)Don't land big jumps on hard throttle

Plastic spur gears tend to not last too long anyways no matter what the brand is, so just have to make sure the things I listed are monitored and taken care of and it'll last you quite some time :)