Buy Rolon Brass Chain & Sprocket Kit (KIT BSORC CL272) for Royal Enfield Thunderbird 350, Classic 350 UCE (Double Disc / Gunmetal Grey / Signals).

Genuine Rolon BSORC CL272 brass chain & sprocket kit for Royal Enfield Thunderbird 350, Thunderbird X 350, Classic 350 Gunmetal Grey and Classic 350 Signals rear disc applications.

Comes with 16T front sprocket, 38T rear sprocket and 102-link chain for stock-style replacement fitment.

Important: This is the rear-disc-linked kit. If your Classic/Bullet 350 UCE has a rear drum brake, use Rolon BSORC CL270, not CL272.

DESCRIPTION

Rolon BSORC CL272 is a brass chain and sprocket kit made for Royal Enfield Thunderbird 350 / TB350CC, Classic 350 Gunmetal Grey and Classic 350 Signals applications. Rolon Premium lists the kit specifically as “Brass Chain and Sprocket kit for TB350CC/GnmtGrey/Signals – KIT BSORC CL272”, confirming its intended Royal Enfield rear-disc-linked UCE 350 use case.

This kit is ideal when your Royal Enfield starts showing drivetrain symptoms like jerky pickup, chain slap, khat-khat noise, uneven pull, rusted chain links, tight spots or hooked sprocket teeth. The verified setup is 16T front sprocket, 38T rear sprocket and 102-link chain, making it suitable for restoring original riding feel on compatible Thunderbird 350 / Classic 350 rear disc models. RoyalBikes also lists CL272 with 102 links, 16T front sprocket and 38T rear sprocket (6H).

The BSORC series uses a brass-plated chain format. Rolon Premium mentions brass-plated inner and outer link plates, enhanced rust protection, a lustrous finish and all-terrain suitability, while other retailer listings repeat the brass-plated positioning for TB350CC / Gunmetal Grey / Signals.

Fitment caution: CL272 is not the same as CL270. Rear drum Classic/Bullet 350 UCE variants use Rolon BSORC CL270. CL272 should be kept for Thunderbird 350 / Thunderbird X 350 / Classic 350 Gunmetal Grey / Signals 350-type rear disc applications where the 16T/38T/102L setup and hub pattern match.

Buy from Under The Hood for genuine sourcing, careful packing, and fitment-focused support from an enthusiast-run spares and service store.

KEY FEATURES & BENEFITS

• Genuine Rolon BSORC CL272 brass chain & sprocket kit.
• Designed for Royal Enfield Thunderbird 350 / TB350CC, Thunderbird X 350, Classic 350 Gunmetal Grey and Classic 350 Signals rear disc applications.
• Not for rear drum Classic/Bullet 350 UCE variants; rear drum models use BSORC CL270.
• Verified configuration: 16T front sprocket / 38T rear sprocket / 102-link chain.
• RoyalBikes lists rear sprocket detail as 38T (6H), useful for rear-disc-linked hub identification.
• Brass-plated inner and outer chain link plates for rust protection and premium visual appeal.
• Helps reduce jerks, chain slap, khat-khat noise and uneven acceleration caused by worn drivetrain parts.
• Stock-style 16/38 gearing feel for daily city riding, relaxed cruising and touring.
• Complete drivetrain replacement kit: front sprocket, rear sprocket and drive chain.
• Better than fitting a new chain on old sprockets or using mismatched local chain-sprocket combinations.
• Direct-fit only for specified rear-disc-linked UCE 350 models when the sprocket pattern matches.
• Supplied by Under The Hood with fitment guidance before dispatch.

TECHNICAL SPECIFICATIONS

COMPATIBILITY SECTION

a) Confirmed Compatible Models

*Years are not cleanly specified in accessible Rolon/retailer data. Use brake type and kit setup as the final check: rear disc + 16T front + 38T rear + 102-link chain.

b) ❓ Likely / Popular Retrofits — Check Before Ordering

• Royal Enfield 350cc UCE rear disc variants using the same 16T/38T/102L setup.
• Classic 350 UCE rear disc conversions only if the rear hub pattern, front sprocket spline and chain length match.
• Check rear sprocket bolt pattern, front sprocket spline, current sprocket teeth and chain length before ordering.

c) Not Compatible / Common Confusion

• Not for rear drum brake Classic/Bullet 350 UCE variants; rear drum uses BSORC CL270.
• Not for Classic 350 Reborn / J-Series.
• Not for Meteor 350, Hunter 350 or New Bullet 350 J-Series.
• Not for Classic 500 / Bullet 500 / Thunderbird 500; Thunderbird 500 applications use different kit codes such as CL273 where applicable.
• Not a generic “all Royal Enfield 350” chain kit.

VARIANTS

Recommended Shopify setup:

• Default Variant: Rolon BSORC CL272 Brass Kit – Rear Disc – 16T/38T/102L

Best for Thunderbird 350 / Thunderbird X 350 / Classic 350 Gunmetal Grey / Signals 350 riders who want a premium-looking brass replacement kit with stock-style gearing.

Do not combine this with CL270 rear drum kit, J-Series kits, 500cc kits or standard non-brass kits unless each kit code has its own verified listing.

WHAT’S IN THE BOX

• 1 x Front Sprocket – 16 teeth
• 1 x Rear Sprocket – 38 teeth
• 1 x Rolon Brass Drive Chain – 102 links
• 1 x Master link / connecting link – if supplied in current Rolon kit packaging
• Rear hub dampers / cush rubbers not included
• Rear sprocket mounting bolts not confirmed as included
• Front sprocket lock washer / nut not confirmed as included

INSTALLATION & MAINTENANCE NOTES

• Install at a professional Royal Enfield workshop for correct alignment, chain slack and torque.
• Replace the chain, front sprocket and rear sprocket together; do not run a new chain on old hooked sprockets.
• Before installation, confirm your current setup is 16T front / 38T rear / 102-link chain.
• Confirm rear disc brake setup before ordering. Rear drum Classic/Bullet variants require BSORC CL270.
• Check front sprocket spline and rear hub pattern before dismantling the motorcycle.
• Maintain chain slack as per Royal Enfield service manual for your exact model.
• Clean the chain with motorcycle-safe chain cleaner and relube every 500–800 km, especially after rain, washing or dusty riding.
• Avoid direct high-pressure water on the chain and sprocket area.
• Re-check chain slack after the first 200–300 km as the new kit beds in.
• Inspect rear hub dampers during installation; worn cush rubbers can still cause jerks even with a new chain kit.

FAQ

Q1. Will Rolon BSORC CL272 fit my Royal Enfield Thunderbird 350?
Yes. BSORC CL272 is listed for Thunderbird 350 / TB350CC applications with 16T front sprocket, 38T rear sprocket and 102-link chain. Verify the current sprocket setup before ordering if the bike has been modified.

Q2. Will BSORC CL272 fit Classic 350 Gunmetal Grey or Signals?
Yes. Rolon Premium and retailer listings identify CL272 for TB350CC, Gunmetal Grey and Signals applications. It is the rear-disc-linked kit, while rear drum Classic/Bullet variants use CL270.

Q3. Is BSORC CL272 for rear disc or rear drum?
BSORC CL272 is for rear-disc-linked Royal Enfield 350 UCE applications such as Thunderbird 350, Thunderbird X 350, Classic 350 Gunmetal Grey and Signals 350. Rear drum Classic/Bullet 350 UCE variants use BSORC CL270.

Q4. What are the sprocket teeth and chain length?
The verified setup is 16T front sprocket, 38T rear sprocket and 102-link chain. RoyalBikes also lists the rear sprocket as 38T (6H).

Q5. Is this a brass chain kit?
Yes. Rolon Premium identifies CL272 as a brass chain and sprocket kit and mentions brass-plated inner and outer link plates.

Q6. Is it O-ring or normal chain?
Available sources clearly confirm brass plating, kit code and teeth/link setup. O-ring/solid-bush construction should be verified from current packaging before marketing it strictly as O-ring.

Q7. Will this reduce khat-khat chain noise and jerks?
Yes, if the problem is caused by worn chain links, tight spots, rust, hooked sprocket teeth or incorrect adjustment. Also inspect wheel alignment, cush rubbers and rear wheel bearings.

Q8. Can I use this on Classic 350 Reborn / Meteor / Hunter?
No. Do not use this listing for J-Series Royal Enfield motorcycles. Classic 350 Reborn, Meteor 350, Hunter 350 and New Bullet 350 J-Series require different fitment.

Q9. Can I use CL272 instead of CL270?
No, not as a shortcut. CL270 and CL272 are different kits. CL270 is for rear drum Classic/Bullet 350 UCE variants, while CL272 is for rear-disc-linked Thunderbird 350 / Gunmetal Grey / Signals applications.

Q10. Should I change cush rubbers with the chain kit?
If the rear hub dampers are loose, cracked or causing drivetrain play, replace them during installation. A new chain kit cannot fully remove jerks if the cush rubbers are worn.