X-Ring Upgrade Chain & Sprocket Kit {Full 520 Conversion} :: Hyosung RT125 | RX125

£100.00 £90.00


  • Better pick up from lights?
  • More top end on longer journeys?
  • Tired of always adjusting the stock 428s?

A serious X-Ring 520 conversion kit tailored strictly for the RT & RX bikes ,…why not!


👇 Details below! #GoFaster? #Fit&Forget?


⚙️ X-Ring Upgrade Chain & Sprocket Kit { Full 520 Conversion } :: Hyosung RT125D RX125SM

🚚 SPECIAL ORDER   # 520 Conversion for RT | RX  

Just like the new GV125 Aquila kit , the Hyosung RT125’s now benefit from complete 428 to 520 conversion chain & sprocket kit. This time You will also have more top end potential over any stock 428 kit (more MPH in top gear for those long tours!).  The Jap spec 520 parts outlive any factory 428-setup for their longevity & much less adjustments to do all the time!

📦 Product Details:

 ⚙ Yamaha Front Sprocket
(SCM420 Chromoly Steel)
 ⛓ JapSpec 520 X-Ring Chain
(DC-XRING | DID-X or JT Racing X)
⚙ 520 Rear Sprocket
(Bolt On Fitment)
 🔧 Genuine Hyosung Washer 🔧 Genuine Sprocket Nut 🔩 4x Stainless carrier bolts (#freebie)

🏁 520 Conversion Kit  Vs  Standard 428 Setup

  • For both the RX & RT125 – the machines will benefit from slightly improved gearing from acceleration to top end.
  • Acceleration is up a bit…
    (Front sprocket has 1 less tooth = slightly better take off)
  • Top speed is extended beyond the 428 setup (more mph)
    (The custom rear sprocket has better gearing so you will definitely go beyond the stock speed limits!) 
  • Made for long Tours or everyday riding = less adjustments to do!
  • Handles extra luggage weight on bike = its less taxing on the 520 vs 428s.
  •   X-Ring  chains will last a long , long time over all Hyosung 428H | 428O chains.

Here you can see the kit as fitted on the RT / RX bikes.  Gallery uploading soon.


This is a special order that will take 4-6 working days to arrive to you.

✔ Fitting Instructions:  None.  Just swap & go #Literally.

✔ Hyosung Model List :: 

RT 125D (All)  XRX125 SM  (99-06)  RX125D  | RX125 SM

📦 Product Colours :: Rear sprocket = Silver or Black (Random) |  Chain = Charcoal/Grey

Need more detailed help?  Visit the Forums!  or send an email if you prefer to!

Ref OEM # = 64511H93B00, 64511HM5400 , 64511H93B01 | 27600HM5400 | 27600HG5801


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Additional information

Bike Model

RT125, RX125/XRX125 SM

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