Uprated Japanese 520 Chain & Sprocket Kit :: Hyosung GT125R GT250R GT125 GT250

14 reviews


  🔥 Popular  

  • Tired of poor standard chains?
  • Slower acceleration?
  • Sprockets are worn too soon?

Fear not, this FULL 520 Conversion Kit is just the fix for the GT125/GT125R’s needing a little zip  & it’s Tour Ready! 🛣
& The 250cc v-Twins benefiting from extra longevity over cheap chains. 👌

Hyosung Chain & Sprocket Kit 520 vs 428

⬇️ See the full details below


⛓ Uprated Japanese 520 Chain & Sprocket Kit :: GT GTR 125 250 RC Hyosung

Uprated Japanese 520 chain & sprocket kit, a full premium conversion setup – Want to go faster on 125cc ?
Based on various customer feedback online, offline & social media, this chain & sprocket kit always gave the 125/250cc bikes the extra zip! 🏁 

📑 Product Details:

⚙ Yamaha Front Sprocket
[ No Chinese Junk! ]
⛓ Japanese 520 Chain
[ From RK | EK | DC | DID & Italy ]
⚙ 520 Rear Sprocket 
[ TC | AFAM EU | or JT ]
🔗Genuine Sprocket Washer
[ Safety Lock Tab ]
🔩 Free Stainless Sprocket Bolts! 
[ Stay shiny! ]


🔵 Product Gains (This kit vs Stock 428) ::

  • From 125cc  to  250cc this 520 kit will max the bike at 90 to 100mph @12k revs max #confirmed✔
  • Acceleration is improved Better 0-60 times ✔
  • Uphill^ rides are better .#guaranteed👍
  • Stock GT125R averages 81-84mph
    { this 520 kit will get to top speed sooner  & over 84+ for 125cc }
  • For 250cc – Acceleration is up a bit & sprocket lifespan is better over stock korea ones. 96-104mph an absolute max =  for track day junkies!
    & For Street Riding =
    Japan Steel chains outlive chinese cheap junk.
  • Great for  125cc Touring.  520 outlives a 428 & inspires distance riding

💬  FAQ: What colours can I get? 💬 FAQ: Can I get a   Gold   Colour Chain?
Chains = Black/Charcoal   |  Rear Sprockets = Silver Contact us for more info, they cost a little extra from the UK Trade Suppliers.


🚚 UK DELIVERY 🔧 Fitting Instructions
ThIs will be a tracked delivery due to weight & contents inside. We use UPS (or HERMES) couriers.
Allow 4-6Working Days for UK Orders
Just Swap & Go ;-).  Literally.

Need detailed help?  Visit the Forums

✈ For overseas customers: send us an email for a shipping quote.

🏍 Model fitment for 125cc Hyosung GT & GTR Bikes:

GT125R & GT125-RC
All years up to 2021
GT125 Naked & GT125P
All years up to 2021

📧 For all other bikes, please browse the shop or  please let us know…

14 reviews for Uprated Japanese 520 Chain & Sprocket Kit :: Hyosung GT125R GT250R GT125 GT250

  1. shane (verified owner)

    Made a improvement to my 125 got abit more top end aswell

  2. Mick (verified owner)

    Fantastic pieces of kit cheers marcel they work a treat

  3. Jason (verified owner)

    Once again amazing service and delivery they look good too

  4. Daryn (verified owner)

    Instant gains from this kit amazing worth every penny

  5. Lee Bartlett (verified owner)

    Fantastic service from marcel.
    Brilliant bit of kit and would recommend anyone looking to upgrade to buy this kit.

  6. Jake Carter (verified owner)

    Fast delivery and straightforward fitment

  7. Andy Elias (verified owner)

    Easy to fit and instant gain, quick service too. cheers Marcel

  8. Matt (verified owner)

    Bought a couple of weeks ago and finally fitted last week. Made a good improvement to gearing and acceleration.

  9. Jed (verified owner)

    Bought to replace my 428 set. Big improvement in gearing and it’s lots smoother now! Bigger sprockets, chunkier chain = better looks. Really happy with the purchase, thanks Marcel!

  10. Andy (verified owner)

    Easy simple fit.

  11. Kevin Barrier (verified owner)

    Straight swap, easy fit. Looks great. Will post pictures later. Bigger front and rear sockets, longer thicker chain. I am perfectly happy with my purchase and hand delivered by Marcel. Excellent product, great store. Will be using again

  12. Owen

    Definitely worth it, Bike now drives much smoother, gearing is way better. I would highly recommend to switch to this kit

  13. dufferdave (verified owner)

    Much better quality than oe items, fitted perfectly, much smoother and performance gains noticeable instantly, well worth the money. thanks Marcel.

  14. Stu (verified owner)

    Bought for 2016 GT. Straight forward swap out. Bike feels better geared in all gears. No massive top end gains but worth it for the increased rideability!!

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