The Pitch of the NSR Pinions, Crowns and Spurs are in the ’48’ range.
http://austinslotcarclub.com/nsr-gears-pitch-table-1/
This is quite common in 1-32 scale gears. The tooth shape of the smaller Pinions is like a tulip or a vaulted-arch. As the tooth count increases, the shape morphs to an “I”. On the drive (Crowns, Spurs, Contrate) the tooth shape is mainly a straight sided Triangle. On Offset Crowns the teeth become slanted so they can mesh easier with the pinions non-angled teeth (similar to a 1×1 differential gear).
USELESS TRIVIA
Whereas in the current 1-24 world, “Coarse” gears are 48p, and “Fine” are 72p.
yet – the most popular in current 1-24 land is 64p (medium) since it has a finer-Lash than 48p but does not Shed as fast as 72p.
If the pitch gets “too fine” (e.g. thin “A” shaped spikey teeth with “V” valleys) they can strip very easily by gunning the motor or during a crash that impacts the tire/wheel assembly (e.g. the motor grinds the pinion into the plastic when the wheel stops after hitting another car or the Wall).
Hence – in the 2021 NSR Catalog (pg27) you see a 8z(teeth) steel pinion (#7408) with a longer “hub” and 64-pitch rating. That pinion is designed to be soldered onto a 2mm motor shaft and meshed to a 64p Spur (flat or 5%-beveled); mounted in an Angle-winder orientation (pinion on left side; clockwise/righty rotation).
"... get on your bad motor scooter and ride!"
Sammy with Montrose