No published motor KV for this brushed motor: compare gearing by rollout.
Background
The UC6 crawler kit pairs a scale cab and interior with alloy axles, steel driveshafts and a two speed transmission that includes a 35 turn brushed motor. Steel beadlock wheels carry 108 mm soft compound tires, with a plastic spare wheel supplied. Its front leaf spring suspension uses dampers, while the rear uses a leaf spring pendulum arrangement. Opening doors and bonnet expose the scale interior and engine shaped electronics housing. 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.
Power
A brushed motor carries current through carbon brushes that rub on the commutator.
It is cheaper and smooth at low speed.
The brushes wear and the motor loses power over time.
That low-speed smoothness is why so many crawlers use one.
Build
A kit you build yourself from parts.
Most kits come without motor, ESC, servo, radio and battery, and many without tires or a painted body.
The manual lists what to add.
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
Power
Brushed
Build
Kit
Part number
CZR90100020
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
108mmStock
Stock
Power
Motor
Brushed motors are commonly described by can size and turns. No motor KV is published for this vehicle; turns alone cannot supply an exact value.
Battery
The highest LiPo cell count the maker rates the electronics for.
The maker does not publish it.
Stock motor
The motor fitted at the factory, as the maker names it.
Brushed motors are often named by can size, such as 540 or 550, and by turns: fewer turns is faster.
Motor
Not published
Battery
Not applicable
Stock motor
35T crawler brushed motorStock
Stock
Performance
Theoretical top speed
No motor KV is published for this model, so the stock specification does not calculate top speed. Compare gearing by rollout, or use a labeled motor reference in the calculator.
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 applicable means the vehicle does not come with it, like the motor on a roller or the tires on a race kit.
Not published means it exists but no source we could find prints it.
