The JT-4 combines 1950s body styling with the EMO chassis, a front mounted motor position and portal axles. Its two speed drivetrain and remote differential locks support both trail running and low speed climbing. Aluminum shocks use dual pitch springs, while stainless steel suspension links connect the axles to the frame. Metal wheels and rubber sealed bearings are supplied with both kit and assembled packages. 1
Specifications
Last modified
13 specifications across 5 groups, covering stock setup, dimensions and components.
Spec
Value
Basis
Vehicle
Class
The kind of vehicle the maker sells it as. It sets what the car is built to do and which cars it is fair to compare it with.
Crawlers are built for slow, controlled climbing over rocks: very low gearing, flexible suspension and locked axles.
Drive
All four wheels are driven. That gives more grip under power, especially on loose ground.
The cost is more parts to maintain.
A crawler needs every wheel pulling to climb.
Build
Ready to run: built at the factory with the electronics installed.
Some come without a battery or charger; the maker's box contents say which.
Scale
The maker's nominal size compared with a full-size vehicle. It works more as a class label than a measurement.
A 1/10 monster truck is far bigger than a 1/10 touring car, so compare length and weight for real size.
Part number
The maker's product number for this exact version.
A V2, a new color, or a kit instead of an RTR usually has a different number, and parts can differ between them.
Check it against your box or receipt before ordering parts.
Class
Crawler
Drive
4WD
Build
Ready to run
Scale
1/10
Part number
CZRJT4RTRY
Drivetrain
Pinion
The small gear on the motor shaft. Fewer teeth gear the car shorter: quicker acceleration, lower top speed and a cooler motor. More teeth do the opposite.
It depends on the motor you fit, so the maker does not list one.
Spur
The large gear the pinion drives. A bigger spur with the same pinion gears the car shorter.
Pinion and spur must have the same pitch, or tooth size, to mesh.
Transmission & axle
Every reduction after the spur, multiplied together: transmission, transfer case and axle gears.
That chain is why a crawler's figure is much higher than other classes'.
It is fixed by the design; the gearing you change is the pinion and spur.
Final drive
How many times the motor turns for one turn of the wheels. A higher number is shorter gearing: more acceleration and pulling power, less top speed.
Crawlers run far higher ratios than other classes, so the truck can creep and hold on a climb.
Pinion
Not published
Spur
Not published
Transmission & axle
Not published
Final drive
Not published
Wheels & tires
Tire diameter
The outside diameter of the mounted tire, tread to tread. A taller tire covers more ground each turn, which gears the car taller.
Crawler wheels are named by rim size, such as 1.9 or 2.2 inches; that is the wheel, not this tire diameter.
Tire diameter
Not published
Power
Motor
Motor KV is the RPM a motor turns per volt with no load.
The maker does not publish it.
Battery
The highest LiPo cell count the maker rates the electronics for.
The maker does not publish it.
Motor
Not published
Battery
Not published
Performance
Theoretical top speed
It needs a motor KV, which this vehicle does not have on record, so no theoretical top speed is worked out.
Theoretical top speed
Not published
How to read these figures
Stock is as the vehicle ships.
Calculated is worked from the stock figures on this page rather than stored beside them, so the two cannot drift apart.
Not published means it exists but no source we could find prints it.
