Mike's 5mm Mod1 pinions?
 

I was hoping that someone could tell me what size allen the set screw on mike's pinion takes. I just want to compare it to my losi pinion.

It's a 2mm hex.

Thats good, the losi's is the smallest size allen I have (1.5mm). They suck!

The Losi's probably use a 3mm set screw. Mike's have a 4mm set screw and so a larger hex drive. It's much harder to strip them out.

I hear you on the losi's, I don't know why they put that small set screw on there.