The MGT spurs work great with some modding. Here's a 52 tooth Mod 1 on my E maxx with a Medusa Motor and a 18 tooth Mod 1 Motor gear.
Just don't mind the carnage. I had an accident. LOL
Notice, there is alot of room in the adjustment to allow for a bigger motor pinion or a smaller one. It's pretty close to the middle with a 18 tooth.