Instructions

TRX-4
•
27
REPLACING THE ALL-TERRAIN TRAXX
WITH WHEELS AND TIRES
Many types of aftermarket tires and wheels can be adapted for
use on your model. Most will affect the overall width and the
suspension geometry of the model. The offsets and dimensions
designed into TRX-4 wheels are intentional; therefore, Traxxas
cannot recommend the use of other non-Traxxas wheels with
different specifications.
When selecting wheels, the inner
diameter of the inside of the
wheels must be 38mm or larger to
accommodate the axle portals. The
TRX-4’s stub axles are 6mm; this may
require drilling the center hole of the
wheel to increase the diameter before
it will fit. When selecting tires, consider
the terrain. Rocky surfaces are better
suited to soft compound tires with
a tight tread pattern. In loose dirt, harder compound tires with a
more open tread pattern should perform better. TRX-4 1.9 Canyon
Trail tires are optimized for all driving surfaces.
Removing the Traxx drive units to install wheels and tires
1. Remove the two 2.5x12mm cap-head screws from the anti-
rotation bracket on the portal gearbox (A).
2. Remove the bracket from the portal gearbox (B).
3. Install two 2.5x10mm cap-head screws (not included) into the
portal gearbox (B).
4. Loosen the stub axle nut on the drive unit using the included
17mm wheel wrench (C).
5. Remove the stub axle nut and the M4x0.7mm wheel nut; then,
remove the drive unit from the stub axle (D).
6. Repeat for the other three
drive units.
7. Install the wheel and tire
on the stub axle (E).
8. Install the M4x0.7mm
wheel nut on the stub axle
and tighten securely.
Repeat for the other three
wheels and tires.
MOTORS AND GEARING
The TRX-4’s Titan
™
550 Motor has been carefully matched to the
needs of the TRX-4. The Titan 550 is made to run efficiently at high
voltage to provide more torque and longer run times. We do not
recommend converting the TRX-4 to a typical low-voltage setup
using traditional 540 size motors. While these components will
physically fit into the TRX-4, the system will not run as efficiently,
losing power in the form of motor and battery heating. The result
will be shorter run times, high current draw, and extreme battery
and motor temperatures.
The TRX-4 is equipped from the factory with a 45-tooth spur gear
and 11-tooth pinion gear. TRX-4 has a large range of gearing,
making it suitable for many different types of applications and
environments. If you want more acceleration and less top speed,
use a smaller pinion gear (fewer teeth, higher numerical ratio). The
overall reduction is the number of turns the motor makes for one
revolution of the tire. Higher numerical ratios provide more torque,
lower numerical ratios provide more top speed. With the Titan 550
motor, do not use a pinion gear larger than 11-tooth with the
stock 45-tooth spur gear.
38mm
Minimum Wheel
Inner Diameter
C
A B
D
2,5x12mm CS 2,5x10mm CS
E
M4x0,7mm
NL
Gearing Compatibility Chart:
The chart below show a full range of
gear combinations. This does NOT
imply that these gear combinations
should be used. Over-gearing
(bigger pinions, smaller spurs) can
overheat and damage the motor
and/or speed control.
Stock factory gearing,
recommended for most running,
6 or 7-cell NiMH, 2s LiPo
Does not fit
Not recommended for stock motor
Spur Gear
Pinion Gear
39 45
9
- 79.00
10
- 71.10
11
- 64.64
12
- 59.25
13
- 54.69
14
- 50.79
15
41.08 47.40
16
38.51 44.44
17
36.25 -
18
34.23 -
19
32.43 -
20
30.81 -
21
29.34 -
22
28.01 -
For 3s LiPo running
ADJUSTING YOUR MODEL