Hero 23123KGH900S Primary Drive Gear C (Yellow) – For Glamour & Super Splendor

Upgrade or replace your primary drive gear with the 23123KGH900S Gear C (Yellow) — a genuine OEM Hero part used in the Glamour and Super Splendor models. This primary drive gear transmits torque from the clutch to the mainshaft, ensuring smooth power delivery. Over time, wear or damage to this gear can cause noise, slippage, or premature failure of the drive train.

Sourced from Hero’s official parts list and validated by multiple trusted spare part dealers, 23123KGH900S is listed as “Gear C Primary Drive (Yellow)” in the official catalog.  It’s sold by spares vendors specifically for Glamour and Super Splendor bikes. 

Installing this gear restores correct alignment in the clutch / transmission assembly. It’s a direct-fit replacement — no machining required when matched properly. Use it when your stock gear is chipped, worn, or misaligned to prevent further damage to neighbouring gears or shafts.

⚠️ Always cross-check your current gear’s part number or vehicle’s parts diagram before ordering.

Key Features:

• Genuine Hero 23123KGH900S primary drive gear (Gear C, Yellow)

• Found in Hero’s official spare parts catalog under “GEAR C PRIMARY DRIVE (YELLOW)” 

• Durable, accurate tooth profile ensures smooth torque transfer

• Helps reduce noise, minimize slippage, and restore proper drivetrain geometry

• Direct-fit for listed Hero models — no modifications required

• Manufactured with high-grade alloy to resist wear

• Precise machining for accurate mesh with companion gears

• Color-coded (yellow) version for correct orientation

Compatibility Table:

✅ Confirmed fitment: Glamour & Super Splendor series as per multiple spare part sources.
❗ Not confirmed for other Hero / non-Hero models unless matching documentation found.

Variants:

• Usually only one variant: Gear C, Yellow (23123KGH900S)

• No alternate color (unless Hero used other color codes in special batches)

• Single unit — no left/right or dual versions

FAQs:

1. Will 23123KGH900S fit my 2015 Hero Glamour?
   Very likely if your bike uses the same primary drive gear setup as listed in spares catalogs. But always confirm using your bike’s existing gear reference or service manual.

2. What does “Primary Drive Gear C” mean?
   It’s one of the gears in the system that connects the clutch to the transmission input shaft — essential for transferring engine power.

3. Why is it colored yellow?
   Hero color-codes this gear (“C”) as yellow in the catalog, likely for visual differentiation or orientation. 

4. Do I need to replace companion gears too?
   Replace only if they show wear or damage. But ideally check Gear B, Gear A, collars, and related shafts to ensure alignment and durability.

5. Can I install it by myself?
   Only if you have mechanical skills: disassemble clutch housing, remove old gear, press in new gear with correct alignment and torque. If unsure, use a trusted mechanic.