TRAXXAS • 25
Motors and Gearing
There are two different types of aftermarket motors that can be
purchased for your model, stock and modified. Stock motors all
have the same wire thickness and number of turns around the
armature as governed by sanctioned racing organizations. They
are inexpensive and widely available. Modified motors are more
expensive, may feature ball bearings, and come in a variety of wire
thicknesses and number of turns of wire on the armature. The fewer
number of turns of wire on the armature, the more powerful the
motor will be. Keep in mind that the more powerful the motor, the
less battery run time you will have.
One of the more significant advantages to your model’s transmission
is the extremely wide range of available gear ratios. It can be geared
low enough to run extremely hot, modified motors. Modified
motors should be geared lower (higher numerically) than stock
motors because they reach their maximum power at higher RPM’s. A
modified motor that is geared incorrectly can actually be slower than
a correctly-geared, stock motor. Use the following formula to calculate
the overall ratio for combinations not listed on the gear chart:
If you are worried that you might be over-geared, check the
temperature of the battery pack and motor. If the battery is
extremely hot, and/or the motor is too hot to touch, your model is
probably over-geared. If you are not able to run your model for at
least four minutes before the battery dies, then change to a lower
gear ratio. This temperature test assumes that the model is close to
factory stock weight and operates freely with no excessive friction,
dragging, or binding, and the battery is fully charged and in good
condition.
The model is equipped with a Titan 12T 550 motor. The gear
combination that comes stock on each model provides good overall
acceleration and top speed. If you want more top speed and less
acceleration install the included high speed gearing (more teeth).
If you want more acceleration and less top speed, use a smaller
optional (not included) pinion gear.
The included high speed
gearing is intended for high-speed running on hard surfaces,
and this gearing is not recommended for off-road or repetitive
starting and stopping.
# Spur Gear Teeth
x 2.72 = Final Gear Ratio
# Pinion Gear Teeth
Stampede
Rustler
Bandit
• Fast Acceleration
• Short Distances
• Small Tracks
14-Tooth Pinion*
90-Tooth Spur
14-Tooth Pinion*
90-Tooth Spur
19-Tooth Pinion*
86-Tooth Spur*
• Good Acceleration
• Good Speed
• Normal Conditions
16-Tooth Pinion
90-Tooth Spur
16-Tooth Pinion
90-Tooth Spur
21-Tooth Pinion
83-Tooth Spur
• High Top Speed
• Long Distances
• Hard Surfaces
21-Tooth Pinion
90-Tooth Spur
28-Tooth Pinion
86-Tooth Spur
31-Tooth Pinion
83-Tooth Spur
*optional (sold separately)
ADJUSTING YOUR MODEL
Gearing Compatibility Charts:
The charts 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. Items in black will fit 540 motors only (not Titan 12T). Items in color
show the acceptable ranges for each model.
The Titan 12T is equipped with
an integrated cooling fan that is
effective during medium to high-
speed operation. The gearbox is
specially vented to cool the motor.
Repetitive starting and stopping over
short distances creates excess heat
and will not allow the fan to cool
the motor properly. For this type
of driving, smaller pinion gears are
recommended to reduce load on the
motor. See the chart to the left.
Spur Gear
Pinion Gear
76
83
86
90
12
-
-
-
20.40
13
-
-
-
18.83
14
-
-
-
17.49
15
-
-
15.59
16.32
16
-
-
14.62
15.30
17
-
-
13.76
14.40
18
-
12.54
13.00
13.60
19
-
11.88
12.31
12.88
20
-
11.29
11.70
12.24
21
-
10.75
11.14
11.66
22
-
10.26
10.63
11.13
Spur Gear
Pinion Gear
76
83
86
90
12
-
-
-
20.40
13
-
-
-
18.83
14
-
-
-
17.49
15
-
-
15.59
16.32
16
-
-
14.62
15.30
17
-
-
13.76
14.40
18
-
12.54
13.00
13.60
19
-
11.88
12.31
12.88
20
-
11.29
11.70
12.24
21
-
10.75
11.14
11.66
22
-
10.26
10.63
11.13
23
-
9.82
10.17
10.64
24
-
9.41
9.75
10.20
25
8.27
9.03
9.36
9.79
26
7.95
8.68
9.00
9.42
27
7.66
8.36
8.66
9.07
28
7.38
8.06
8.35
8.74
Spur Gear
Pinion Gear
76
83
86
90
12
-
-
-
20.40
13
-
-
-
18.83
14
-
-
-
17.49
15
-
-
15.59
16.32
16
-
-
14.62
15.30
17
-
-
13.76
14.40
18
-
12.54
13.00
13.60
19
-
11.88
12.31
12.88
20
-
11.29
11.70
12.24
21
-
10.75
11.14
11.66
22
-
10.26
10.63
11.13
23
-
9.82
10.17
10.64
24
-
9.41
9.75
10.20
25
8.27
9.03
9.36
9.79
26
7.95
8.68
9.00
9.42
27
7.66
8.36
8.66
9.07
28
7.38
8.06
8.35
8.74
29
7.13
7.78
8.07
8.44
30
6.89
7.53
7.80
8.16
31
6.67
7.28
7.55
7.90
Stampede
Rustler
Bandit
Key:
Stock (Recommended for most conditions)
Included Optional
Usable Range
High Speed, Hard Surfaces Only
Not Recommended
-
Does Not Fit
