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MOTOR AND GEARING
The E-Maxx is equipped from the factory with a 68-tooth spur gear
and 17-tooth pinion gears. E-Maxx 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. Use the following
formula to calculate the overall ratio for combinations not listed on
the gear chart:
# Spur Gear Teeth
x 5.22 = Final Gear Ratio
# Pinion Gear Teeth
Caution!
Operating your model with 65+mph gearing
• The 28/65 ratio for use with 6S LiPo batteries is designed
for maximum speed on smooth surfaces only, with steady
acceleration to full throttle and optional Talon tires installed.
• Do not use this gear ratio for general driving.
• Avoid repetitive starting and stopping.
• Do not use the 28/65 ratio with NiMH batteries or low-capacity
LiPo batteries. 5000mAh LiPo batteries are recommended.
• Allow the motor to cool between runs, and monitor motor
temperature.
• Do not use the 28/65 gear ratio for off-
road running or overheating and damage
may result.
• Do not allow the motor temperature
to exceed 200° F or damage and motor
failure may result. To accurately monitor
motor temperature and prevent
overheating, a telemetry temperature
sensor (part #6523) is included with
your model. The sensor is installed
on the motor to continually monitor
temperature as you drive. See page 26 for
more information on real-time telemetry
and TQi advanced tuning.
Adjusting Gear Mesh
Incorrect gear mesh is the most
common cause of stripped spur
gears. Gear mesh should be
checked and adjusted anytime
a gear is replaced. Access the
gears by removing the single
screw on the top gear cover.
To set the gear mesh, cut a
narrow strip of notebook paper
and run it into the gear mesh.
Loosen the motor screws and
slide a motor and pinion gear
into the spur gear. Retighten the
motor screws and then remove
the strip of paper. Repeat with
the other motor. You should
be able to run a fresh strip of
paper through the gears without
binding them.
Model #39085
Speed
35+ mph
Pinion/Spur
17/68
Twin 7-Cell NiMH
Battery
(14 cell total)
Nominal Voltage
16.8V
mAh
4000+ mAh
Skill Level
*with included optional gearing
**28T pinion and 65T spur not included.
For high-speed running on smooth surfaces with optional Talon tires only.
TUNING ADJUSTMENTS
Motor
Screw
Strip of
Paper
Your Battery Selection and Pinion Gear
Selection Determines Your Speed.
How Fast Do You Want To Go?
65 mph
40+ mph*
50+ mph
& Beyond
20/68
17/68
28/65**
Twin 2S LiPo
Twin 3S LiPo
Twin 3S LiPo
(4S total)
(6S total)
(6S total)
14.8V
22.2V
22.2V
5000+ mAh
5000+ mAh
5000+ mAh
For Expert Drivers
Gearing Compatibility Chart:
The chart below shows 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.
Spur Gear
65
15
DNF
16
DNF
17
DNF
18
DNF
19
3.42
20
3.25
21
3.10
22
NR
23
NR
24
NR
Stock gearing
B
Optional included gearing (4S LiPo)
B
Recommended gearing
for all battery types
Recommended gearing
for 4S LiPo only
Not recommended
Does not fit
For Expert Drivers
E-MAXX BRUSHLESS • 23
68
4.53
4.25
4.00
3.78
3.58
3.40
3.24
3.09
DNF
DNF
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