Description Primary gear -BGM PRO- Vespa PX200, Rally200 – 64 tooth (helical) BGM primary wheels are developed for the enormous power and torque of today’s engines. They are made of a high-alloy steel (SCM415 / 15 CrMo 5) to the highest manufacturing standards. High-quality material 15 CrMo 5 Precise production according to Honda standard Continuous quality control Useable with all transmissions manufactured since 1962 (or all with 30mm long primary springs) Available with 64 or 65 teeth Combinable with original coupling pinion: 23Z Combinable with BGM coupling pinion for COSA2: 22Z, 23Z, 24Z The primary wheel with 64 teeth is particularly interesting. The possible combination with the BGM clutch sprockets with 22, 23 or 24 teeth covers a transmission ratio range of 2.90-2.66. This means that, if a different exhaust or cylinder is fitted, the transmission ratio can be perfectly adjusted without splitting the engine simply by changing the clutch sprocket. All BGM Superstrong clutches with 22 (for primary wheel 65), 23 and 24 teeth can be combined with these wheels
