V1.0
RUNGU Electric Juggernaut Mid-Drive Version (MDV) User Manual
–
2018 model year
Copyright 2018 Standard Bearer Machines, LLC
36
Press “+” to increase the power by one level; Press “
-
“ to decrease the power by one level.
As you’re
riding you can increase and decrease the maximum power output of the motor on the MDV. In general
if you’re operating the MDV on flat paved roads
, using level 2 is adequate to maintain a speed of 10 mph
with minimal effort.
If you’re
riding steep inclines off-road or in deep sand/snow, use a combination of
appropriate gearing and a power level of four or five. The table below shows the power levels and how
they correspond to the maximum power output to the motor:
Appropriate gearing takes full advantage at each power level. Using the shifter on the right handlebar,
you can change the gearing for the MDV. The MDV has ten gear ratios or speeds. In the highest gear
(first gear) the standard ratio is 42:11 (the optional 30T chainring has a gear ratio of 30:11). For every
rotation of the crank arms, the rear wheel turns 3.8 times, which is good for maintaining higher speeds.
However, the torque output is 1/3
rd
of the motor output so acceleration and hill climbing using this gear
ratio is a bad idea. In the lowest gear (tenth), the gear ratio is 42:36 (The optional 30T chainring has a
gear ratio of 30:36). For every rotation of the crank arms, the rear wheel turns 1.2 times; not so good for
maintaining higher speeds, but great for getting the torque out of the motor for hill climbs and loose
ground. Learn to use the gear shifter to adjust to terrain to take full advantage of each power level you
choose.
Note: The optional 30T chainring generates more force for climbing, but does not travel as fast as an
MDV outfitted with the standard 42T chainring.
Caution: Shifting gears while using power level 5 maximizes chain wear and may result in a broken
chain. The MDV uses a chain designed for the output of the motor, however repeated gear changes at
the higher power levels increases side-to-side wear which can weaken and break a link. Be prepared
always and carry an extra chain for replacement.
Accessing the display settings
To access the display settings, press the “I” button twice
in succession within two seconds. The screen
shows three settings: Display Setting, Information, and Exit. Navigate the list using the “+” and “
-
“ keys;
use the “I” key to mak
e a selection. The Display Setting item has multiple settings that are fully
described in the XXXXX manual you can find in your USB document drive or on line at this link.
Power
Level
%
Maximum
Power
Maximum
Power
(Watts)
0
0%
0
1
20%
336
2
40%
672
3
60%
1008
4
80%
1344
5
100%
1680