TFR
Try ordering the pinion sets from
www.mdiracing.com. Send Les an email. He'll track them down for you. Here's the Tamiya part#'s
53101 0.4, 20T and 21T pinion
53102 0.4, 22T and 23T pinion
53103 0.4, 24T and 25T pinion
You might also want an extra spur just in case yours gets chewed up on race day! It's part# 53104 and comes with the 93T and 104T gear.