RAMBO R500X2K-FF-BFD User manual

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KRUSADER: R500X2K-FF-BFD / KRUSADER: R500X2K-FF-VWC
Assembly Operation
Scan the QR code for a video of step-by-step assembly and operation
Rambo Bikes
22844 230th Ave
Centerville, IA 52544
First Edition, December 2022, Published by Rambo Bikes, Centerville Iowa. All rights reserved.
TABLE OF CONTENTS

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GENERAL WARNINGS………………………………………………………………………………. 3,4
RULES FOR SAFE RIDING…………………………………………………………………….……. 5-7
GENERAL RIDING INFORMATION……………………………………………………………… 7,8
IDENTIFYING BIKE PARTS…………………………………………………………………………. 9
FEATURES OF YOUR BIKE……………………..…………………………………………………… 10
ASSEMBLY………………………………………………………………………………………………… 11-14
OPERATING INSTRUCTIONS……………………………………………………………………… 15,16
BATTERY CHARGING AND STORAGE………………………….……………………………… 17-19
INSPECTION BEFORE EVERY RIDE……………………………………………………………… 20,21
MAINTENANCE AND CARE…………………………………………………………………….…. 21,22
TROUBLESHOOTING GUIDE………………………………………………………………………. 23,24
STANDARD LIMITED WARRANTY…………………………………………………………...... 24,25
Contact Information
Email: [email protected]
Phone: [phone]
Website: rambobikes.com
Serial Number
This is a good time to record your serial number on your bike. The serial number is in two locations, one spot is
a white sticker on the outside of the bike box. The second is on the bike headtube (below where the handlebar
mounts on the frame).
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GENERAL WARNINGS:

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Should you have any questions about the assembly and/or use of this product, or any other Rambo Bikes
product(s) do not hesitate to call one of our customer service representatives at [phone] or visit
Rambo Bikes online at rambobikes.com. Our Customer Service Representatives will answer any questions you
may have about any of the complete line of Rambo Bike’s products.
PLEASE MAKE SURE TO READ THE ENTIRE MANUAL AND UNDERSTAND ALL WARNINGS AND CAUTIONS
BEFORE OPERATING THIS BIKE
WARNING: MISUSE OR IMPROPER USE OR OPERATION OF THIS PRODUCT CAN LEAD TO LOSS OF CONTROL
AND CAN POSSIBLY RESULT IN DEATH OR SERIOUS INJURY. THERE ARE POTENTIAL RISKS AND HAZARDS
ASSOCIATED WITH RIDING A BIKE. CAUTION IS REQUIRED.
CAUTION: OBSERVE CONDITIONS AND MAINTAIN SAFE RIDING PRACTICES
WARNING: PRODUCT UNDER POWER AND MOVING PARTS
WARNING: BEWARE OF ELECTRICAL FIRE OR SHOCK
ALWAYS WEAR AN ASTM OR CPSC CERTIFIED HELMET AND PROTECTIVE ATTIRE INCLUDING SHOES.
KEEP THIS INSTUCTION MANUAL IN A SAFE PLACE FOR FUTURE REFERENCE.
FAILURE TO READ AND STRICTLY COMPLY WITH THE INSTRUCIONS CONTAINED IN THIS INSTRUCTION
MANUAL MAY RESULT IN SERIOUS INJURY OR DEATH.
THE SAFE USE AND OPERATION OF THIS PRODUCT IS THE SOLE RESPONSIBILITY OF THE USER. IT IS ALSO THE
SOLE RESPONSIBILITY OF THE OWNER TO PROVIDE ANY PERSON(S) WHO BORROW OR PURCHASE THIS
PRODUCT WITH THESE INSTRUCTIONS. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS
INJURY OR DEATH! ADDITIONALLY, FAILURE TO FOLLOW THIS INSTRUCTION MAY SUBJECT YOU TO
PERSONAL LIABILITY PENALTIES AS DETERMINED BY THE U.S. JUDICIAL SYSTEM.
Recommended Rider Size:

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No rider under the age of 18 should be permitted to use the bike. It is up to your discretion to know and
understand if you are able to ride the bike safely.
No person should ride the bike if they cannot reach the ground while seated.
If you are not comfortable on the bike, they should not attempt to ride the bike.
Maximum Weight Limit: 300lbs
RULES FOR SAFE RIDING
You must ensure that you understand the safe operation of this bike and follow all traffic, bike laws and
regulations in the area in which the bike is being operated. These may include rules regarding helmets,
reflectors, and lights. A few important general rules for riding include but are not limited to:
- Wear a helmet that meets ASTM or CPSC safety testing requirements.
- Have reflectors and lights installed on your bike
- Use proper hand signals
- Avoid loose clothing
- Ride on the correct side of the road with flow of traffic
- Always wear brightly colored and reflective clothing
- Ride single file if riding with others
- Obey all traffic laws and regulations

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- Watch for parked car doors opening unexpectedly
- Watch for pedestrians stepping out, pets and children playing near roadways
- Never carry a passenger
- Never ride with earbuds or headphones
- Always obey traffic signals
- Use caution when crossing railroad tracks and carefully cross at a 90 degree angle
- Mount a horn or bell on to your bike to signal others of your approach
- Before riding fast or in more difficult conditions, try riding at slower speeds in a flat, open area to test the
function and performance features of your bike.
Wet Weather Conditions
Use extra caution when riding in wet weather. Your brake stopping power will be diminished in wet conditions
no matter what type of brake system you have; all are affected by wet weather. To ensure you can stop safely
in wet conditions, ride more cautiously and slowly and brake earlier than you would in normal road and
weather conditions. Never ride in storms with high winds and lightning.
Check the Lights and Reflectors
Make sure the reflectors are mounted in the proper position and they do not have any cracks or visible
damage. All lighting should be inspected to be sure they have fresh batteries and work properly.
Check Frame, Fork, and Components
If you notice that the frame or fork has any visible damage, cracks, dents, or you hear any unusual noises while
riding or other problems, do not ride your bike. If at any time you notice a shimmy or wobble immediately
slow down and take your bike to your local bike shop for inspection and/or repair. Carefully inspect your bike
before and after each ride. Certain types of impacts can affect the components of your bike and cause them to
fail unexpectedly. After any impact or crash, thoroughly inspect all the parts of your bike for damage. A crash
or other impact can put extraordinary stress on the bike. An impact or high force is any situation such as
hitting a hole or obstacle in the road, such as a bump or curb.
A BIKE IS A MECHANICAL DEVICE. MATERIALS AND MECHANISMS ARE SUBJECT TO FATIGUE AND STRESS.
OVER TIME, COMPONENTS CAN FAIL ONCE THEY HAVE EXCEEDED THEIR USEFUL LIMITS AND LIFE. PRODUCT
LIFE IS OFTEN RELATED TO THE KIND OF TREATMENT AND RIDING YOU SUBMIT YOUR BIKE TO. HARD AND
AGGRESSIVE RIDING ALONG WITH NEGLECT WILL SHORTEN THE PROJECTED LIFESPAN OF YOUR BIKE AND
ITS COMPONENTS. IF NOT PROPERLY MAINTANIED, YOUR BIKE AND ITS COMPONENTS CAN FAIL CAUSING
SERIOUS INJURY OR DEATH.
Night Riding and Poor Visibility

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Riding at dawn, dusk, during poor visibility or night riding is extremely dangerous. Your reflectors are not a
substitute for the required bike lights. Motorists and pedestrians may not be able to see a bicyclist during poor
visibility conditions. Consult your local bike shop for night riding equipment if you choose to accept the risk of
riding during these conditions.
RIDING A BICYCLE IN LOW LIGHT CONDITIONS WITHOUT PROPER LIGHTING AND REFLECTORS ATTACHED TO
YOUR BIKE IMPAIRS YOUR ABILITY TO SEE AND BE SEEN BY OTHER MOTORIST OR PEDESTRIANS. THIS
GREATLY INCREASES THE CHANCE YOU WILL BE INVOLVED IN AN ACCIDENT THAT COULD LEAD TO SERIOUS
INJURY OR DEATH. USE A LIGHT ON THE FRONT AND REAR OF YOUR BIKE AND BE SURE ALL REFLECTORS
ARE IN PLACE BEFORE RIDING IN LOW LIGHT CONDITIONS.
Unsafe Riding
While not all accidents can be avoided the list below outlines a few examples of things that can decrease your
risk of serious injury or death.
- Pay attention and avoid distractions while riding
- Always maintain both hands on the handlebars
- Avoid bike stunts and/or aggressive riding
- When carrying gear make sure it is securely attached to your bike and/or rack
- Never strap or latch any item to your bike in an area not designed to carry gear
- Never carry a passenger while riding
- Avoid riding in mud, if possible, mud may cause loss of traction resulting in loss of control of your bike
CERTAIN TYPES OF RIDING SIGNIFICANTLY INCREASE STRESSES AND ABNORMAL WEAR AND TEAR ON YOUR
BIKE. THESE ARE JUST A FEW TYPES OF RIDING THAT CAN ADVERSELY AFFECT YOUR SAFTY AND LIFESPAN
OF YOUR BICYCLE AND COMPONENTS, SUCH AS COMPETITION OR STUNT RIDING, DOWNHILL
RACING/RIDING, or JUMPING YOUR BIKE.
Avoid riding too fast
Higher speeds create higher risks and greater forces in the event of a crash. At higher speeds, it is more likely
that wheels will slip, or that a small bump can create a significant impact to your frame or fork. Always keep
your bicycle under control. For children, the limit of speed for safe riding is much lower, so parents should
strictly enforce this rule.
Off-Road or Backcountry Riding

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Always use special care when riding off-road or in remote areas. If you are unfamiliar with off-road riding start
out on moderate terrain and slowly build your skills until you are confident you can ride on trails and
unimproved roads. Remember, always keep your bike under control and never attempt an obstacle that is
beyond your skill level. Riding at an increased speed in rough conditions greatly increase your risk of serious
injury or death.
Special Considerations for Remote Areas
- While riding on rough terrain even if only a short distance, share your destination and route with another
adult
- Never ride alone in remote areas
- Carry a signaling device such as a whistle, cell phone, or 2-way radio
- Take identification and emergency food and drink with you
- Wear appropriate clothing and safety gear for the type of riding you plan
- Carry a first aid kit
Respect local regulations and rules / Private Property
Remember each area in which you may ride your bike may have specific regulations. Always respect private
property and never trespass. Respect the rights of others you may be sharing the trail with. i.e.: hikers,
cyclists, equestrians. Stay on your designated trail and do not destroy vegetation and minimize your impact on
the environment. If you are unsure of your local laws or regulations, please contact your local conservation
officer before riding on designated wildlife areas.
A BIKE, LIKE ANY MECHANICAL DEVICE, IS SUBJECT TO FATIGUE, STRESS AND WEAR. OVER TIME AND DUE
TO USE, THE FRAME AND ITS COMPONENTS CAN FAIL. THE ENVIRONMENT AND TYPE OF RIDING THE BIKE IS
SUBJECT TO, CAN GREATLY REDUCE ITS USEFUL LIFESPAN. IF PROPER CARE AND MAINTENANCE ARE NOT
PREFORMED YOUR BIKE AND/OR ITS COMPONENTS CAN FAIL CAUSING SERIOUS INJURY OR DEATH.
GENERAL RIDING INFORMATION
Once you have inspected your bike and all components are in proper working condition, you are ready to test
ride your new bike. A few important general rules for riding include but are not limited to:
- Strap on your helmet that meets ASTM or CPSC safety testing requirements
− Have reflectors and lights installed on your bike
− Use proper hand signals
− Avoid loose clothing
− Ride on the correct side of the roadway with flow of traffic

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− Always wear brightly colored and reflective clothing
− Ride single file if riding with others
− Obey all traffic laws and regulations and traffic signals
− Watch for parked car doors opening unexpectedly
− Watch for pedestrians stepping out, pets and children playing near roadways
− Keep a safe stopping distance between you and other vehicles
− Never carry a passenger
− Never ride with earbuds or headphones
− Use caution when crossing railroad tracks and carefully cross at a 90 degree angle
− Mount a horn or bell on to your bike to signal others of your approach.
Braking: Your bike is equipped with two hand brakes. One hand brake operates the front brake and the other
operates the rear. Take time to familiarize yourself with which hand brake stops each wheel. You can
complete this task by spinning the front wheel and squeezing each brake lever one at a time to determine
which one stops the wheel from spinning; this would be your front brake.
When preparing to slow down or stop, gently apply both front and rear hand brakes at the same time being
careful not to over apply the front brake which could cause you to lose control and fall. Before riding your bike
for the first time please follow the "Brake Burn in Procedure" in your owner’s packet. Replacement Pads and
Rotors are available from Rambo Bikes. Always replace pads and rotors at the same time to ensure maximum
performance and lifetime.
AVOID APPLYING SUDDEN OR EXCESSIVE FORCE TO THE FRONT BRAKE SYSEM. DOING THIS CAN CAUSE
YOUR FRONT WHEEL TO LOCK UP AND YOUR REAR WHEEL COULD LIFT UP AND LOSE CONTACT WITH THE
GROUND. SLIDE YOUR WEIGHT BACK ON THE SEAT AND APPLY PRESSURE TO BOTH THE FRONT AND THE
REAR BRAKES AT THE SAME TIME.
IDENTIFYING BIKE PARTS

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FEATURES OF YOUR BIKE

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Pedal Assist:
This bike has the pedal assist feature. When on pedal assist level 1-5 the motor will assist you while pedaling. Pedal
assist 1 being the slowest and least powerful and 5 being the fastest and most powerful. If on Pedal Assist level 0 you
will not have any motor assistance.
Thumb Throttle:
Your bike has a thumb throttle located on the handlebars, either on the left or right side of the bars, depending on the
model. The thumb throttle can be used at any time even from a complete stop it can be used to take off and assist you
up to max speed. Please note, the power of the thumb throttle is set to match the power of the pedal assist level you
are on, 1 being the slowest and least powerful and 5 being the fastest and most powerful. If on Pedal Assist level 0 the
thumb throttle will not have any power.
Walk Assist:
By holding down on the “–” button your bike will enter walk assist mode, the bike will propel itself as you walk along
side of it. Make sure your rear gears are on a larger sprocket to ensure the bike moves at a slower speed.
USB Charging:
Your Bike is equipped with USB charging while the bike is turned on. You can charge devices such as cell phones, and
other devices that use USB charging cables. Locating your USB port; most USB ports are located at the bottom of the LCD
screen, while Megatron and Krusader models are located at the bottom of the power off/on switch.
On Demand All Wheel Drive:
Your bike has on demand all-wheel drive, at any time you can choose between front wheel, rear wheel, or all-wheel
drive. Simply double tap the “+” button for front wheel drive, or double tap the power button for all wheel drive, or you
can double tap the “–” for rear wheel drive.
Dual Battery Technology:
With the battery installed from the bottom of your bike frame, you are able to install a secondary battery on the top of
your bike frame. The additional battery is a 48v 14ah battery. Contact Rambo Bikes for more information.
Suspension Fork:
Your bike has front suspension that is mainly set and adjusted by air pressure. To test if your suspension is set properly,
there should be 20% compression on the suspension when you are in riding position. If the suspension is too stiff or too
soft, it will need to be adjusted using an air suspension air pump. In most cases the PSI in the fork will be around 120lbs.
There are also quick adjustments for the fork on the top of the suspension, turning the knob towards the lock will make
the fork stiffer and turning away will make the suspension softer.

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ASSEMBLY
Tools Required:
One (1) 19mm wrench
One (1) 15mm wrench
One (1) 5mm Allen wrench
One (1) 4mm Allen wrench
Side cutting pliers
Air Pump
BEFORE DOING ANY WORK ON YOUR BIKE ALWAYS BE SURE TO REMOVE THE BATTERY
First remove the bike from the box and remove all protective packaging and zip ties using side cutting pliers.
BE SURE NOT TO CUT ANY ELECTICAL WIRES OR BRAKE CABLES.
Once the packaging material is removed from the bike, remove the Allen bolts from the handlebar clamp using
a 4mm Allen wrench. At this time be sure to turn the stem so it is facing forward. As shown below.
Next, install the handlebars to the stem using a 4mm Allen wrench. Be sure to tighten the
Allen bolts in a cross pattern when tightening. Tighten to 45 IN-LBS or 5 NM (Make sure the
stem is pointed forward) as shown below.

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Then flip the bike upside down so that the bike is resting on the seat and the handlebars. Loosen the axle nuts
from the axle, then put the wheel into the fork making sure the anti-turn washer is on the inside of the fork,
and the tab on the anti-turn washer is locked into place on the fork dropout as shown below. The motor
power wire should be facing down (with the bike upside down, or facing up, when the bike is upright). Once
the wheel, anti-turn washers and brake rotor are aligned on the fork tighten both axle nuts.
Use a 19mm wrench to tighten the axle nuts firmly. As shown below.

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Attach the pedals to the bike by using a 15mm wrench, be sure to identify the correct pedal for the correct
side, there is a R or L marked on the end of the pedal bolt. Be sure to note that the left pedal is reverse
threaded. It is recommended to add general purpose grease to the threads before installing the pedals. (Right
and Left is determined when sitting on the bike)

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After the pedals are installed flip the bike over onto the wheels and be sure to check that the handlebars are
aligned with the front tire. Then tighten both sides of the stem to the fork using a 4mm Allen wrench, tighten
to 45 IN-LBS or 5 Nm.
Then Check the tires for proper air pressure, the minimum and maximum air pressure should be between
10psi-25psi.
Once the bike is assembled, fully charge the battery, and install the battery into the bike frame, being sure to
insert the key and turn clockwise to open the battery latching system.

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OPERATING INSTRUCTIONS
Before operating it, be sure the rider can keep balance by testing the bike without using the motor to ensure
the rider is capable.
Be sure the seat height is set properly; the rider should be able to put both feet on the ground while fully
seated. The seat post has a minimum insertion point, be sure not to extend the seat beyond this line.
When using it for the first time, be sure to practice in a safe environment with no obstacles or hazards.
ALWAYS WEAR AN ASTM OR CPSC CERTIFIED HELMET AND PROTECTIVE ATTIRE INCLUDING SHOES
THROTTLE OPERATION
To operate your bike using the thumb throttle simply press the throttle downward. Note that the thumb
throttle is set to match the PAS (Pedal Assist Level). This means that if the assist level is at zero the thumb
throttle will not activate the motor. The higher the assist level the more power the thumb throttle will have.
SHIFTING
Picture OF SHIFTER
LCD INFORMATION
Below is a picture of the LCD on your bike, note that when the pedal assist level is on 0 there is no power from
the motor for both pedaling and for using the thumb throttle. Once the assist level is set above 0 the motor
will have power and pedal assist and the thumb throttle will be activated. Note that once you come to a
complete stop the LCD will reset the pedal assist level to 0 after 15 seconds, this is a built-in feature to ensure
safety. The on demand all-wheel drive system can be switched any time while riding.

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Each PAS (Pedal Assist Level) is approximately 20% motor power. Level 1 is 20%, Level 2 is 40%, Level 3 is 60%,
Level 4 is 80% and Level 5 is 100% motor power.

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RANGE ESTIMATES
The range that you can get on a single charge depends on many variables such as terrain, hills, windy
conditions, rider weight, rider assistance. To extend your range you can ride at a lower assist level, use pedal
assist instead of throttle only, pedal when starting from a complete stop.
Range Estimate up to 25 miles is using throttle only on PAS levels 3-5 with mostly flat ground.
Range Estimate up to 35 miles is using pedal assist on level 3-4 with mostly flat ground.
Range Estimate up to 45 miles is using pedal assist on level l-3 with mostly flat ground.
BATTERY INSTALLATION/REMOVAL
CHARGING/STORAGE
WARNING: NO CHILD UNDER THE AGE OF 8 YEARS OLD SHOULD ATTEMPT TO CHARGE THE BATTERY ON
THEIR OWN.
WARNING: DO NOT SHORT CIRCUIT, DO NOT CRUSH, DO NOT HEAT, OR INCINERATE, DO NOT IMMERSE IN
ANY LIQUID, DO NOT DISASSEMBLE.
Checking Battery Level:

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Installing/Removing Battery:
Insert the key into the keyhole, then turn the key clockwise as indicated on the keyhole, this will unlock the
battery latch and allow the battery to drop down to the second safety latch. Then turn the safety latch on the
battery and lower the battery out of the frame. When installing the battery, be sure the battery clicks twice
into the frame and the battery is sitting flush with the frame. The first click is the safety latch, and the second
click is the lock system for the battery.
Charging:
Do not charge the battery at temperatures below freezing and above 113 Fahrenheit (45 Celsius)
ONLY USE CHARGER THAT IS SUPPLIED WITH THE BIKE TO CHARGE THE BATTERY, DO NOT USE ANY OTHER
CHARGER.
WARNING: DO NOT CHARGE BATTERY FOR LONGER THAN 12 HOURS
WARNING: ALWAYS CHARGE IN A DRY AREA
The battery can be charged while on the bike, make sure to turn the bike off before charging the battery
and/or removing the battery.

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Install the charging plug into the battery charging port, as shown below.
When charging the charger will display red, and once fully charged the charger will turn green.
Charging will take approximately 5hrs depending on the battery level.
Storage:
Always store the battery in a dry place with temperature above freezing and below 113 degrees Fahrenheit
(45 Celsius)
It is best practice to store the battery with a charge above 50%
To extend the life of your battery it is best to discharge and charge every 3 months.

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INSPECTION BEFORE EVERY RIDE
Before every ride, inspect the bike with the following check list. If any part of the bike fails the inspection,
repair the bike by following the information provided in this manual or take the bike to your bike shop for
service. Never ride a bike with a damaged part; have it replaced.
Tires and Wheels
-Spin each wheel and check that the tires are in good shape with no cuts or abrasions. If these are found,
replace the tire immediately.
-Inspect the rim for trueness by spinning it and watching for any side-to-side or up-and-down wobble. If any
movement is noted do not ride this bike until the rim is repaired.
-Check the tire inflation. Make sure to check tire pressures using a tire pressure gauge. The tires should be set
between 10 psi and 25 psi.
NEVER SET TIRE PRESSURE BELOW 10PSI OR ABOVE 25 PSI
A WHEEL ATTACHMENT DEVICE THAT IS NOT PROPERLY ADJUSTED AND CLOSED MAY ALLOW THE WHEEL
TO BE LOOSE OR COME OFF UNEXPECTIDLY, CAUSING YOU TO LOSE CONTROL AND FALL. MAKE SURE THE
WHEELS ARE PROPERLY ATTACHED BEFORE RIDING THE BIKE.
Wheel Retention System:
-Your bike comes with a bolt on style front axle, make sure the front tire is centered on the fork. Once
centered, secure the wheel to the front fork with a washer and nut on each side. Be sure the anti-turn washer
is installed properly.
-Check that the disc brake operates properly.
-Illustration below shows the correct tightening of the front wheel.