Team Associated RC10B74 Center Differential Spur Gear Set (72T & 78T)

Fits well and works well as long as you don’t get any dirt, sand or tiny rock in a tooth. The spur gear is the only thing that I’ve had to replace on the b74.1d after 8 months of use. Strong little buggy

I am writing this review having not actually used the 78t yet, ( I am currently running 13.5T Boost class with a 72t spur / 23t pinion). I was pleasantly surprised at the quality of the spur. I am assuming these are molded which can sometimes yield an oblong gear. But these seem to be perfectly round. I quadruple checked while setting the mesh. I was going to buy some of the Revolution designs machined spurs, but as long as these are perfectly round and wear okay, I'm going to just stick with the Associated.