The KRATON® 4X4 4S BLX Speed Monster Truck RTR marks the next evolution of the ARRMA® 4X4 4S platform — longer, wider, and tougher than the previous chassis for no-holds-barred bashing action, with a Spektrum™ 4S brushless power system factory-installed.
16% Larger footprint – longer and wider than the previous KRATON® 4X4 4S platform for added stability
Tough new suspension arms that increase vehicle width
Durable steel 1.35 module main diff gears and input gears in the front and rear gearboxes
Strong CVD telescopic driveshafts front and rear
Higher shock towers, longer shocks and wider suspension arms for longer, more plush suspension travel
 
In The Box
(1) ARRMA® KRATON® 4X4 4S BLX 1/10 Scale 4WD Speed Monster Truck RTR
(1) Spektrum™ Firma™ 120A Smart Waterproof ESC
(1) Spektrum™ Firma™ 3668 2400Kv Brushless Motor
(1) Spektrum™ 2.4GHz SLT3™ 3-Channel Transmitter
(1) Spektrum™ SR315 Dual Protocol Receiver
(1) Spektrum™ SPMS652 Metal-Geared Digital Servo
(1) 23T Spline Servo Saver
(1) 1/10 KRATON 4X4 4S V2 BLX Manual
 
Needed to Complete
(1) 3S or 4S LiPo Battery with EC5™ or IC5® connector
(1) Compatible Battery Charger
(4) AA batteries for Transmitter
*Maximum battery dimensions 6.14x2.01x1.89 in (156x51x48mm). Minimum battery specs 5000mAh 35C.
 
Recommend battery/charger combo pack SPMXPSS400 for $149.99  which includes (1) S155 G2 1x55W AC Smart Charger (SPMXC2050) and (1) 5000mAh 4S 14.8V Smart G2 LiPo 50C: IC5 (SPMX54S50H5) Option to add at time of purchase.
 
New Features
16% Larger footprint – longer and wider than the previous KRATON® 4X4 4S platform for added stability
Tough new suspension arms that increase vehicle width
Durable steel 1.35 module main diff gears and input gears in the front and rear gearboxes
Strong CVD telescopic driveshafts front and rear
Higher shock towers, longer shocks and wider suspension arms for longer, more plush suspension travel
Aluminum big bore shocks included as standard
CNC machined, red anodized 17mm wheel hubs
Steel slipper hub strengthening ring
Spektrum™ Firma™ 120A brushless ESC and 3668 2400Kv motor
Spektrum™ 2.4GHz SLT3™ transmitter and SR315 receiver
Spektrum™ S652 Steel Metal-Geared, waterproof digital servo with 232 oz-in of torque
Sway bars fitted front and rear for improved cornering dynamics
Wheelie bar with rubber tires
Low-profile dBoots® Copperhead 2 LP tires with vents to disperse water for improved durability
Proven 4x4 Platform Features
Rubber shielded bearings
Metal internal-geared diffs
Steel spur gear
Strong composite chassis with extended height dirt defenders
Adjustable turnbuckles
Steering system with stone clearance
ARRMA® motor heatsink and cooling fan
Easy-access modular design — power, diff and electronics modules can be removed quickly and easily for maintenance
Battery retention system including wire clips
2-Year limited warranty (see website support for details)
 
A bigger, tougher KRATON® 4X4 4S BLX
The original ARRMA® KRATON® 4X4 4S BLX provided the perfect middle ground between the agile 3S BLX vehicles and bigger, more powerful 6S BLX machines. It delivered affordable performance for brushed bashers looking to upgrade and for any driver wanting ARRMA® toughness and speed.
This new version marks the next evolution of the capable ARRMA® 4X4 4S platform — longer, wider, and tougher than the previous chassis for even greater stability and control. It also includes a full package of Spektrum™ radio electronics and is the first ARRMA® 4X4 to come equipped with a Spektrum™ 4S brushless power system.
The footprint of this KRATON® 4X4 4S BLX Speed Monster Truck is 16% larger than the previous model, with higher shock towers, longer shocks, and wider suspension arms for longer, more plush suspension travel. The strength of the transmission has been bolstered with the inclusion of steel gearbox input gears, steel main diff gears and CVD Driveshafts. Upgrades are joined by proven features from before that deliver unstoppable performance in environments ranging from off-road, dirt, and grass to parking lots, paved and asphalt surfaces. These include a strong composite chassis and retained hinge pin plates; protective skid plates in front and rear; steering with more clearance for stones; a castellated slipper pad and sliding gear mesh; and rubber-shielded bearings throughout. The KRATON® 4X4 4S BLX also incorporates the signature ARRMA® easy-access modular design to make routine maintenance fast and simple.
Made of high-quality rubber, the dBoots® Copperhead 2 LP tires offer an aggressive, chunky tread pattern for excellent traction on a wide range of surfaces. They're also vented to disperse water for improved durability. Front and rear bumpers protect against impacts and a wheelie bar with rubber tires provides stunt potential.
Completing the ready-to-run package are a Spektrum™ SLT3™ 2.4GHz radio with SR315 receiver and a stronger, faster Spektrum™ S652 digital servo. 
 
LONGER CHASSIS
For this new version of the KRATON® 4X4 4S BLX Speed Monster Truck, ARRMA® engineers lengthened the vehicle to 21.54 inches – 0.74 inches longer than previous model — for increased stability and control.
 
WIDER TRACK
To handle more aggressive bashing, the front and rear track width has been increased with new, wider arms to 17.72 inches – 1.89 inches more than the previous KRATON® 4X4 4S BLX Speed Monster Truck.
 
DESIGNED TOUGH
Features that contribute to the 4X4 4S BLX platform's unstoppable performance include a stronger composite chassis and retained hinge pin plates; protective skid plates in front and rear; steering with more clearance for stones; a castellated slipper pad and sliding gear mesh; and rubber-shielded bearings throughout. Extended height dirt defenders limit the amount of dirt and debris that can reach the chassis tub. Front and rear bumpers offer defense against impacts.
 
MODULAR DESIGN
The KRATON® 4X4 4S BLX Speed Monster Truck RTR incorporates the signature ARRMA® easy-access modular design. Separate, easily removable chassis modules for the power system, electronics and differential components make routine maintenance fast and simple.
 
BIG BORE OIL-FILLED SHOCKS
Longer, aluminum-bodied, oil-filled big bore shocks are included and mounted on higher shock towers. These plus the wider suspension arms give the vehicle longer, more plush suspension travel.
 
STEEL INPUT & MAIN DIFF GEARS
The input and main differential gears are now manufactured from steel. Combined with the steel internal differential gears these provide an extremely strong transmission for the KRATON® 4X4 4S BLX Speed Monster Truck.
 
CVD SLIDER DRIVESHAFTS
The driveshafts on the KRATON® 4X4 4S BLX Speed Monster Truck are now a CVD design. These feature strong, hard wearing steel couplings and axles. The sliders are manufactured from a tough, impact absorbing composite material.