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BK4R- Right side view Double swingarm

RG BK-4R

$2,500.00 Regular Price
$2,300.00Sale Price
RG BK-4R 1:5 Scale GP Racing Motorcycle Kit
 
๐Ÿ† 20-Times World Champions Platform

(5x Nitro โ€ข 7x Stock โ€ข 8x Superbike โ€” including 2025 Superbike World Champion in Brisbane)
 
The BKR-4 is the latest evolution in the legendary BK series. Built by hand, one at a time, by expert builders โ€” every screw torqued, every setting dialed, every bike delivered with a pro base setup. No guesswork. Just confidence.
 
Why BKR-4?
 
  • Refined chassis with more space + flex tuning options
  • CNC precision parts & anodised finish
  • Floating front axle + NAI Fork system = razor-sharp handling
  • Optional double swingarm kit for max lean + balance
  • Includes GRP tyres, clear lexan fairing & rider
 
 Race Proven. Hand Built. World Champion DNA.
Build your dream with your own electronics, or email us to order your custom Ready-to-Run BKR-4, tailored and track-ready on arrival.
 
Quantity
SKU: RG-BK4RS2A

  • More Info

    The future of large-scale RC racing is here.

    Meet the BKR-4 โ€” smarter, tighter, and faster than ever.

    Whether you're pushing for podiums or carving corners for fun, this bike delivers next-level feel, flexibility and control.

    Key Features:

     

    • Refined Chassis Layout
      More space, cleaner layout โ€” easier ESC installs and optional cross bracing so you can dial in your flex the way you like it. Additional body post added to keep the lower fairing more secure at high speeds and in cross wind conditions. 
       

    • New 3-Piece Receiver Box & Cooling Ducts (Now Standard)
      Keeps things cool and secure. Easy swaps if things go sideways mid-race.
       

    • Floating Front Axle & Updated Hub System
      Less play. More control. Say goodbye to any risk of fork bind and vague steering.
       

    • Optional Double Rear Swingarm Kit
      Flip the driveline based on track direction. More lean angle. Better balance. Retrofits to previous models too.
       

    • Fixed Front Brake Rotor
      No more drag. Just smoother wheel spin and sharper handling where it counts.
       

    • NAI Fork System โ€“ Now Included
      Proven, race-ready suspension right out of the box. 

     

    Choose Your Spec:

     

    • Superbike or Stock Bike Kit
      (Stock Bike version comes without front brake components)
       

    • Single-Sided Swingarm: Sexy...what more can you say... oh and quick tyre swaps

     

    All kits include a set of GRP tyres and a complete fairing and rider upainted in clear lexan. 

     

    Required to complete:

     

    Steering servo 

    Lipo battery

    brushless ESC and motor combo of choice. 

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