Originally Posted by RC MARKET
Spur gear only bigger 108T to 110T only !
You do not need to waste money on these new bulkheads. All you need to do is use the Kinbrough Spur gear, 108T 64P, and you can run your 3.5/4.5 motors fine. The Diameter of the Kmbrough spur gear is a little bigger than the rest, which allows it to mesh like if its a 110T gear. I speak from experience...