Hero Genuine Chain Sprocket Kit (Chain Kit) for Hunk 150 & Xtreme / CBZ X-Treme – Part No. 20K1010S

Restore smooth pickup and reduce chain noise with the Hero Genuine Chain Sprocket Kit (Chain Kit) Part No. 20K1010S—verified for Hero Hunk 150 and Hero Xtreme / CBZ X-Treme models. Genuine fitment ensures correct pitch alignment, safer power transfer, and longer service life compared to local duplicates.

The Hero Genuine Chain Sprocket Kit (20K1010S) is the OEM final-drive replacement set used when your bike starts showing classic wear signs—chain tight spots, jerks under load, sprocket “hooked teeth,” excessive noise, or frequent slack changes. This kit is meant for Hero Hunk 150 and the older-generation Hero Xtreme / CBZ X-Treme family (carb-era), where correct sprocket machining and accurate chain pitch are critical for smooth torque delivery. 

Choosing genuine Hero parts matters here because non-OEM chain kits often have inconsistent heat treatment and tooth profile, leading to premature wear, vibration, and loss of refinement. Genuine components maintain intended driveline geometry, helping protect the output shaft splines and improving riding feel in city + highway use.

As per trusted genuine-parts listings, this is supplied as a 3-part kit (chain kit set) and is commonly identified by mechanics as “chain kit / chain-sprocket set / chain gear set / sprocket set (chain chakkar set)”. 

At underthehood.co.in, we focus on proper packaging + careful dispatch so you receive the correct genuine part number for your bike—important in a market full of lookalikes.

KEY FEATURES / BENEFITS 

• Genuine Hero MotoCorp part (OEM) – correct pitch and tooth profile for proper fitment 

• Designed for Hero Hunk 150 and Hero Xtreme / CBZ X-Treme applications 

• Complete chain kit set helps restore smooth pickup and reduces driveline snatch

• OEM-grade sprocket machining supports better chain life with correct alignment

• Listed as a 3-part kit (typical chain + sprockets set format)

• Ideal replacement during periodic service when sprocket teeth are worn or chain has tight links

• Helps reduce repeat adjustments caused by mixed old/new chain-sprocket combinations

• Clear identification by Part No. 20K1010S to avoid wrong “similar-looking” kits 

COMPATIBILITY TABLE

PLEASE CHECK PART NUMBER BEFORE PURCHASE 

Fitment Note (important): Some sellers label this as “Xtreme 160”; however, to avoid wrong fitment, confirm your exact variant in Hero e-catalogue / ASC using Part No. 20K1010S before ordering, especially for Xtreme 160R / newer FI models. 

TECHNICAL SPECIFICATIONS

• Part Number: 20K1010S 

• Category: Chain Sprocket Kit / Chain Kit (final drive set) 

• Kit Type: 3-part kit (as per dealer specification) 

• Material (listed): Steel / high-carbon steel (listing-based) 

• Country of Origin: India (Hero genuine parts channel) 

WHAT’S IN THE BOX

• 1 x Hero Genuine Chain Sprocket Kit (Chain Kit Set) – Part No. 20K1010S 

Note: Many genuine listings describe this as a 3-part kit (typical chain + front & rear sprocket set). Verify exact contents printed on the pack you receive. 

INSTALLATION & USAGE NOTES

• Best installed by a Hero Authorised Service Centre or an experienced mechanic.

• Replace chain + sprockets as a complete set (avoid mixing old sprocket with new chain).

• Check rear wheel alignment and set chain slack as per owner’s manual / ASC procedure.

• Inspect front sprocket retainer/lock, rear sprocket bolts, and chain guide condition during install.

• After fitment, re-check slack after a short ride and lubricate the chain regularly.

WARRANTY & RETURNS

• This is a genuine Hero spare part and is eligible for Hero’s standard manufacturing warranty as per applicable terms. 

• underthehood.co.in will support genuine, valid manufacturing-defect cases; final approval rests with Hero / authorised channel policy.

• Installed/used drivetrain parts are generally not returnable unless confirmed manufacturing defect (unopened/unused condition is easiest for resolution).

FAQs 

Q1. Is 20K1010S an original Hero chain kit or aftermarket?
It is listed as a Hero genuine chain sprocket kit part number. Always match the exact part code 20K1010S on the pack/label. 

Q2. Will this fit Hero HF Deluxe / Splendor / Passion?
No—those models use different chain sprocket kit part numbers. Use your bike’s Hero e-catalogue to match the correct code (do not “adjust-fit” chain kits). 

Q3. Does it fit Hero Hunk 150?
Yes, multiple genuine parts listings map 20K1010S to Hunk variants (carb-era). Still, confirm variant/year with ASC if your registration/model differs. 

Q4. Does it fit Hero Xtreme / CBZ X-Treme?
Yes, it is consistently listed for Xtreme / CBZ X-Treme generation models.

Q5. Will it fit Xtreme 160R (BS6) or Xtreme 200?
Do not assume. Many newer FI/BS6 models use different chain pitch/ratios. Order this only if your Hero e-catalogue / ASC confirms 20K1010S for your chassis/variant. 

Q6. Should I replace only the chain or the full kit?
Best practice is to replace chain + both sprockets together. Replacing one part alone often causes faster wear and noise.

Q7. What are common mechanic names for this part?
“Chain kit, chain sprocket set, chain gear set, sprocket set, sometimes ‘chain chakkar set’.” (Always verify by part number 20K1010S.)