Okay gents. All I can say is I won't be changing pistons again. The 1.3/8 and splits in the rear were the best I have tried. TLR 35 1.3/8 in the front and 1.2-1.3/8 TLR 27.5 in the rear was the ticket for me. Smooth dry track today and the kit was on rails. I will be trying 30 in the rear but man I was dialed today. Silver springs front and rear.