[rja]

I belive the 53/51 is for the sno-pro and the 53 is for the standard, which is what my standard has in it. The reason is probaly because the 1.375 track sucks down the rpm on the top end and the 51 deg angle allows the rpm to stay at peak.

 

[LINE EM UP]

I bought a FBP accelator kit with helix and heavy hitters running about 70 grams of weight. RUNS HARD.