Ring and pinion sets

The two gears of a differential or axle set, by tooth count: the large ring gear and the small pinion that drives it. A set lists one of each, so the ring tooth count over the pinion tooth count is the final drive ratio of that axle or differential (37T over 13T is 2.85:1). Pitch or module is shown only where the maker states it; a ring and pinion mesh only as a matched pair, so check the pitch before mixing sets. These are differential gears, not motor pinions (see Pinions).

30 specs, sorted by size. Counts are the branded sets that hold each gear.