Hi, only reason I'm looking at swapping to 48pitch is because of outdoor racing.Recently, I ran our state titles and in practise, almost destroyed the 64pitch spur gear.no one else ran 64p and none of the hobby shops had any in stock. I ended up removing the damaged spur and turning it around,ran the 2 day event with it and finished 2nd in the B Final.Although the competition wasn't really hot, I am very happy with the strength and durability of the Pro 4 !!!