SG-B190-CS2 — GSR Countershaft 2nd Gear (Pro Series, 1.90 Ratio)

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SG-B190-CS2 — GSR Countershaft 2nd Gear Pro Series 1.90 Ratio

Description

The SG-B190-CS2 is a countershaft 2nd gear for Honda B-series (GSR/B18C) gearboxes. Its 1.90 ratio sharpens the 1→2 upshift and mid-range pull. Precision-hobbed helical teeth with edge relief, plus a ground bore and locating faces, deliver quiet, rigid mesh and smooth synchronizer engagement—a true drop-in for rebuilds or performance upgrades.

Specification

Tooth Form: Helical

Tooth Count: 38T

Material: SCM415 / SAE 8620 alloy case-hardening steel (or equivalent)

Heat Treatment: Carburized & quenched

Surface Hardness: HRC 58–62

Manufacturing: CNC turning/milling; precision hobbing; dog-tooth finishing & deburring; bore & faces precision-ground