SG-B103-MS4 — GSR Mainshaft 4th Gear

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SG-B103-MS4 — GSR Mainshaft 4th Gear

Description

The SG-B103-MS4 is a mainshaft 4th gear for Honda B-series (GSR/B18C) gearboxes, engineered for strong mid-range acceleration and durability. Precision-hobbed helical teeth with edge relief plus ground bore & faces deliver quiet, rigid mesh and smooth synchro engagement with the mating countershaft 4th gear—making it a true drop-in for rebuilds or performance refreshes.

Specification

Tooth Count: 29T

Tooth Form: Helical

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 & locating faces precision-ground