Originally Posted by Phoebus28
Just counted my spur and it's a 61 so I'll have to order a 19T pinion unless anyone else wants to chime in
Just be sure you get a Tamiya metric pitch pinion.
The American 48P gears are a slightly different pitch from Tamiya 48P gears so the two will not mesh correctly.
These Tamiya pinion sets are available:
50355 18T, 19T AV Pinion Gear Set
50356 20T, 21T AV Pinion Gear Set
50357 22T, 23T AV Pinion Gear Set
These are 48 pitch metric pinions. The number of teeth is stamped on the pinion so they can be identified which is which, and are made of aluminum.