Originally Posted by
JoeyE
Too small. You'll have to mill out the motor mount for it to fit smaller spurs. I got a 86T(64P) on with a little milling. Then ended up using 90T(64P).
On the 417X, I've used spurs as small as 60T (48pitch) without any modification. You need this to get the gearing in blink 21.5, which is popular in these here parts...