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Hi everyone! After a bunch of searching on Google and this forum, I couldn't figure out what kind of pinion/spur should I order for my soon to be TA02? I'm looking for a 25T/66T combo for a high powered b/l motor. I know Robinson Racing makes every imaginable pinion in steel, which is what I need, but I'm not sure about the pitch/bore I need. Some places say the pinion has to be 0.4 metric, some say 48p, and others just state I need to match it to the spur. What is correct? Some introduction since this is my 1st post here: I've been into cars since I was born, and a couple of months before getting my license I worked at an amateur toy/hobby store. We had some interesting 1/10 RTR and kits that we almost never sold, and some beaten up dummy TT01 to exhibit. One day I decided to ask the owner to have myself a kit and he agreed to sell it to me at what it cost him. A few months later, I had 3 shells(LaFerrari, Z4M Racing, 997 GT3 Cup), a brushless 8.5T motor running on the lowest gearing possible on a TT-01, and lots of TT-01E and aftermarket alu hop ups too. And then I sold it. Now, a couple of years later, having my own car and missing the whole building/driving a 1/10th scale RC car, I started searching and figured the best choice for me would be the 993 GT2 "TA02SW" by Tamiya. Now after getting some parts, although not the kit itself, I wanted to figure out what spur/pinion ratio I'm going to run. My current goal is either 4.5T or 3.5T motor, with 25/66 gearing.