Rolon Chain & Sprocket Kit BSOR 177 – KTM Duke 125 (14T / 45T, 520 O-Ring, 112 Links)

Is your KTM Duke 125 chain getting noisy, jerky or stretched before time? The Rolon BSOR 177 Chain & Sprocket Kit is a premium 520 O-ring replacement set designed specifically for the Duke 125, giving you smoother drive, cleaner power delivery and longer life compared to basic non-sealed chains.

This kit uses a 520 sealed O-ring chain (R520BSOR-112-2) paired with a 14T front sprocket and 45T rear sprocket, exactly as specified in Rolon’s own kit catalogue for KTM Duke 125. The sealed design helps retain lubrication inside the links and keeps dust and water out – perfect for Indian conditions where a stock chain can quickly become dry, rusty and noisy.

Whether you ride daily to college/work or do weekend highway runs, this kit helps reduce chain slap, improves throttle response and gives a more planted feel when accelerating or engine braking.

Buying from UNDER THE HOOD means you get 100% genuine Rolon stock, carefully packed, never loose or repacked, with real workshop backing – the same kind of spares we trust on customers’ bikes at our Varanasi studio. Pair it with a good chain cleaner and lube for maximum life and peace of mind.

Key Features

• Exact Duke 125 spec kit – Designed for KTM Duke 125 with 14T front, 45T rear sprocket and 520 pitch chain as per Rolon kit catalogue BSOR 177.

• 520 O-ring sealed chain (R520BSOR-112-2) – Better lubrication retention and protection vs open roller chains for longer life and reduced stretch.

• 112-link chain length – Correct length for stock Duke 125 swingarm and sprocket setup, no guesswork cutting required when installed properly.

• 14T front sprocket (S 02 249) – OE-equivalent spline fitment with two mounting points, optimised for stock gearing and city + highway mix.

• 45T rear sprocket (S 02 459, 4-hole hub) – Matches the OEM rear hub pattern used on Duke 125 with 4-bolt sprocket carrier.

• Smoother acceleration & less chain noise – Sealed design helps reduce jerks, chain slap and whine when properly adjusted and lubricated.

• Better durability for Indian roads – Handles dust, rain and stop-go traffic better than basic non-sealed replacement chains when maintained as per KTM manual.

• 100% genuine Rolon – Sourced from authorised channels; no local duplicate or re-packed loose kits.

• Workshop-backed support – UNDER THE HOOD team can guide you on installation, chain slack and maintenance, based on real KTM service experience.

Compatibility Table

Important: Fitment is based on Rolon’s official kit catalogue + KTM chain specs. Always cross-check your existing sprocket tooth count and rear hub pattern before ordering.

*For most Indian bikes, Duke 125 Gen1/Gen2 roughly corresponds to pre-Gen3 models (generally up to ~2023). If you’re unsure, WhatsApp us your bike’s photo + RC and we’ll help you confirm before shipping.

Not listed = Not confirmed. We do not claim fitment for RC 125, Duke 200, Duke 250, etc. unless verified separately.

Variants

This listing covers one standard Rolon kit spec:

• Rolon BSOR 177 – KTM Duke 125 (14T / 45T, 520 O-ring, 112L)

If you’re looking for cosmetic/colour upgrades (brass/coloured chains, altered gearing, etc.), check our other Rolon performance kits for KTM – this BSOR 177 kit prioritises reliability and OEM-like gearing over show-off looks.

What’s in the Box

• 1 × Rolon 520 O-Ring Chain – 112 Links

  • Chain code: R520BSOR-112-2

• 1 × Front Sprocket – 14 Teeth

  • Sprocket code: S 02 249 (spline fit, 2 mounting points)

• 1 × Rear Wheel Sprocket – 45 Teeth

  • Sprocket code: S 02 459 (4-hole hub)

• Manufacturer packaging / Rolon box

• UNDER THE HOOD protective packing for courier transit

(No chain lube / cleaner included – we recommend adding a dedicated chain care combo from our store for best results.)

Installation & Maintenance Notes

• Professional installation recommended – Especially if your current chain is badly worn or sprocket nuts are seized. Incorrect fitting or over-tightening can damage wheel bearings and gearbox output shaft.

• Replace as a set only – Always change chain + front sprocket + rear sprocket together for best life and least noise, as also recommended by KTM.

• Chain tension: Follow the Duke 125 owner’s manual. KTM specifies approx. 5–7 mm chain tension at the top run, measured as per the manual’s method (with top run taut).

• Lubrication interval: Clean and lube every 500–700 km in normal use, sooner after rain, washing or dusty rides.

• Cleaning: Use a proper chain cleaner + soft brush, avoid petrol/diesel as it can damage O-rings.

• Check alignment: After installation, ensure the chain adjuster marks on both sides line up correctly and the wheel is straight.

• Service life: With correct tension and regular lube, a sealed chain kit like this typically lasts significantly longer than basic non-sealed kits (actual life depends on riding style and maintenance).

FAQs 

Q1. Will the Rolon BSOR 177 kit fit my KTM Duke 125?
A: If your Duke 125 uses a 14T front sprocket, 45T rear sprocket, 520 pitch chain and 4-bolt rear hub, this kit is designed as a direct replacement, matching Rolon’s official fitment for Duke 125. For the latest Gen3 model, hub design has changed, so please share a photo of your rear sprocket/hub with us on WhatsApp before ordering.

Q2. Is this better than the stock Duke 125 chain & sprocket set?
A: The BSOR 177 kit uses a sealed O-ring chain, which holds lubricant inside the links far better than basic open chains and offers improved resistance to dust and water. When maintained properly, most riders experience longer life, less stretch, smoother power delivery and lower chain noise compared to cheaper non-sealed replacements.

Q3. Is this an original Rolon kit or a local duplicate?
A: UNDER THE HOOD only sells genuine Rolon kits sourced from authorised distributors, shipped in original branded packaging. We also run a real workshop, so we only stock parts we are comfortable installing on customers’ bikes. No loose-packed or counterfeit chains.

Q4. Will this kit fit KTM RC 125 or other KTM models like Duke 200/250?
A: This specific kit number BSOR 177 is catalogued for KTM Duke 125 with 14T/45T, 520 chain and 4-hole rear hub. Fitment on RC 125 / Duke 200 / Duke 250 is not confirmed, as sprocket sizes and hubs can differ. Please use a model-specific kit for those bikes or contact us for guidance.

Q5. How many kilometres can I expect from this kit?
A: Life depends heavily on riding style, chain tension and maintenance. With correct adjustment (as per KTM manual), regular cleaning and quality chain lube, many riders see strong performance for 20,000 km+ under mixed city/highway use. Aggressive riding, lack of lubrication or poor adjustment will reduce life on any chain kit.