Frequently Asked Questions about Rockbike Rumble

The Rockbike Rumble is a compact 20-inch e-fatbike with a retro moped design. It combines wide 20 × 4 inch tires, a long seat, and a distinctive steel frame with the technology of an electrically assisted bicycle.

The Rumble was developed for city, daily life, leisure, and rides on asphalt as well as on paved roads.

The Rockbike Rumble features wide 20 × 4 inch fatbike tires. The tires not only shape the appearance but also provide additional comfort on varying and uneven surfaces due to their large air volume.

More information on the characteristics of this tire size can be found in our guide to 20-inch e-fatbikes .

The Rockbike Rumble is equipped with hydraulic disc brakes and 180 mm brake rotors.

Hydraulic brakes generally allow for controlled modulation. Brake pads, rotors, and the entire braking system must still be regularly checked and serviced as needed.

Yes. The Rumble has a suspension fork on the front wheel. It can absorb shocks and bumps on the front wheel.

However, the Rumble is not a full-suspension mountain bike and is not designed for jumps, stunts, or demanding downhill trails.

Yes. The Rockbike Rumble is equipped with a Shimano 7-speed gear system. Through gear selection, you can adjust the cadence to speed, inclination, and riding surface.

Yes. The battery of the Rockbike Rumble can be removed for charging or safe storage.

This allows the battery to be charged, for example, in the apartment, garage, or at the workplace without the entire e-fatbike having to be directly next to an electrical outlet.

Currently available colors and variants are displayed directly on the product page. Not every color may be available at every warehouse location at all times.

The decisive factor is the variant selected during the order process and listed in the order confirmation.

According to current product specifications, the Rockbike Rumble is suitable for riders with a body height of approximately 150 to 195 cm.

In addition to body height, leg length, arm reach, mobility, and personal feeling when mounting and dismounting are also crucial. Riders at the extreme ends of the specified range should pay particular attention to being able to safely operate the handlebars, brake levers, and seating position.

Yes. The 20-inch designation primarily describes the size of the wheels and does not mean that the bike is only for children.

The Rockbike Rumble combines the small wheels with wide 4-inch tires and an adult-friendly frame geometry. For fit, the frame, handlebar position, and seat height are more important than the inch designation alone.

The maximum specified payload capacity of the Rockbike Rumble is up to 180 kg.

The payload includes the rider, luggage, and attached accessories. The specifications in the product documentation of the delivered bike are authoritative. The permissible load for individual attachments may be lower.

The long seat does not automatically mean that the bike is approved for two people.

The Rockbike Rumble is generally intended for use by one rider, unless the product documentation of the respective version explicitly states approval for carrying another person.

A second person may not be carried solely due to the length of the seat.

The Rockbike Rumble is suitable for, among other things:

• City rides and daily commutes,
• Commuting to work and school,
• Leisure rides and weekend tours,
• Asphalt and cobblestones,
• Firm forest and gravel paths,
• Campsites and holiday resorts.

It is not designed as a downhill, motocross, or stunt bike.

Normal moisture and light rain are part of a bicycle's typical everyday use. However, electrical components must not be intentionally submerged or cleaned with a high-pressure washer.

Follow the instructions in the user manual and dry the bike after riding in wet conditions. The battery, charging port, and electrical connections must be dry before charging.

In the pedelec configuration intended for Germany, the Rumble has a motor with 250 watts of continuous rated power and pedal assistance that assists up to a maximum of 25 km/h.

Such a pedelec is generally treated like a bicycle in Germany, provided the motor only assists when pedaling, the assistance ends at 25 km/h, and no unauthorized modifications have been made.

For public road traffic, the bike must also be equipped with the necessary bicycle equipment such as functioning brakes, lighting, reflectors, and a bell.

For a properly configured pedelec with 250 watts of continuous rated power and pedal assistance up to 25 km/h, no driving license or moped license is required in Germany.

For the permissible pedelec configuration, no insurance plate is required in Germany.

However, voluntary bicycle or e-bike insurance may still be useful, for example, as protection against theft or damage.

For a regular pedelec up to 25 km/h, there is no legal helmet requirement in Germany. For safety reasons, Rockbike still recommends wearing a suitable bicycle helmet on every ride.

A pedelec legally classified as a bicycle may generally be ridden on bike paths like a regular bicycle.

If a bike path is mandatory due to the corresponding blue traffic signs, the same rules apply as for other bicycles.

In the German pedelec configuration, regular motor assistance only occurs while pedaling.

Any existing start-up or pushing assistance may only operate up to the legally permitted speed. Independent acceleration without pedaling beyond this range can change the legal classification of the bike.

Technical modifications that cause the motor assistance to no longer end at 25 km/h or the bike to go faster without pedaling are not permitted for operation as a normal pedelec on public roads.

Such tuning can legally turn the bike into a motor vehicle. This can require, among other things, an operating permit, an insurance plate, a driving license, and a helmet.

Tuning can also affect warranty claims and lead to significant liability and insurance problems.

No. Regulations for motor power, speed, lighting, throttle, helmet requirements, insurance, and use of public roads may vary depending on the country or region.

The buyer is responsible for checking and complying with the regulations applicable in their place of residence and use.

The Rockbike Rumble is equipped with a 250-watt rear hub motor. The motor assists the rider when pedaling and ends electric assistance in the permitted pedelec configuration at 25 km/h.

Electric pedal assistance operates up to a speed of 25 km/h.

Riding faster through your own muscle power or downhill is generally possible. Above 25 km/h, the motor in the intended pedelec configuration does not provide further assistance.

Rockbike states a possible range of approximately 60 to 80 kilometers for the Rumble.

The actual range is not a fixed value. It depends, among other things, on the assistance level, rider weight, luggage, route, inclines, temperature, wind, tire pressure, gear selection, and your own pedaling effort.

With high assistance, low temperatures, or many inclines, the achievable distance can be significantly lower.

The main influencing factors include:

• high assistance level,
• frequent starting and braking,
• steep inclines,
• high rider and luggage weight,
• too low tire pressure,
• headwind,
• low temperatures,
• soft or uneven ground,
• age and condition of the battery.

You can find more information in our E-Fatbike Range Guide .

A full charge takes approximately four to six hours, depending on the remaining charge, temperature, and charging conditions.

Only use a charger approved for the battery and observe the safety instructions in the operating manual.

The removable battery can be charged in a suitable, dry, and well-ventilated location.

The battery should not be charged in escape routes, on flammable surfaces, in direct sunlight, or at extreme temperatures. Only use the designated charger and observe the included safety and charging instructions.

Yes. The Rockbike Rumble can basically be ridden without electrical assistance by pedaling.

However, due to its weight, wide tires, and design, more effort is required than with a lightweight bicycle.

Store the battery in a dry, protected place, away from extreme heat or cold. The battery should not be completely empty before long-term storage, nor should it remain permanently connected to the charger.

Check the charge level regularly and observe the specific storage instructions in the operating manual.

Rockbike covers regular standard shipping to supported delivery addresses within the European Union, Switzerland, the United Kingdom, and the contiguous United States.

For islands, special areas, and hard-to-reach regions, different conditions or additional transport costs may apply.

Orders within the European Union are usually shipped from our European warehouse in Poland.

Orders within the contiguous USA are usually shipped from our US warehouse.

Deliveries to Switzerland and the United Kingdom usually take place from our European warehouse.

No. Free shipping only includes regular transport costs.

For deliveries outside the European Union, import tax, import VAT, possible customs duties, customs clearance fees, and carrier fees may apply.

These costs are not covered by Rockbike and must be paid by the recipient.

Regular EU orders are shipped from our warehouse in Poland, and thus within the European Union.

For the recipient, no additional import duties or customs clearance fees arise from such a delivery.

The recipient pays the import tax, possible customs duties, presentation fees, and customs clearance fees levied upon import into Switzerland.

Rockbike only covers regular standard shipping. The final amount of import costs is determined by authorities and transport service providers.

The recipient pays the British Import VAT, possible customs duties, as well as handling and customs clearance fees of the transport service provider.

These amounts are not included in the purchase price and not in the free standard shipping.

Orders within the contiguous USA are usually shipped directly from our US warehouse. For such a domestic delivery, no import duties usually arise.

Sales tax, which may be applicable depending on the state and delivery address, may be calculated during the ordering process.

The currently expected delivery time is displayed on the product page or during the ordering process.

Delivery time depends, among other things, on the destination country, stock availability, payment clearance, transport service provider, and possible customs clearance.

After the order has been handed over to the transport service provider, you will receive a shipping confirmation.

If tracking is available, the message will contain a tracking link or further information about the delivery status.

Due to the size and weight of the shipment, delivery to packing stations, post office boxes, or similar parcel lockers is usually not possible.

Please provide a complete, regularly accessible delivery address.

Photograph the shipping carton, the shipping label, and the affected area of the bike as completely as possible.

Then contact Rockbike customer service with your order number, a description, and the pictures. Do not dispose of the packaging before the matter has been checked.

The Rumble is delivered securely packaged in a box and is already largely pre-assembled.

Before the first ride, some final work may still be necessary, such as aligning and securing the handlebars, mounting the pedals, and checking safety-relevant screw connections.

Before the first ride, at least the following points should be checked:

• secure fit of handlebars and stem,
• correct assembly of the pedals,
• function of front and rear brakes,
• secure fit of wheels and axles,
• appropriate tire pressure,
• function of lights and bell,
• secure fit of the battery,
• correct function of gears and motor assistance.

If you are unsure about the assembly, the final assembly and safety check should be carried out by a bicycle workshop.

The appropriate tire pressure depends on the tire model, rider weight, load, and ground conditions.

Observe the permissible pressure range on the tire sidewall and in the operating manual. Too low pressure can impair range, riding stability, and puncture resistance.

Brakes, tires, screw connections, chain, gears, and lighting should be checked regularly.

After the first rides, a renewed check is recommended, as screws, spokes, and cables can settle during the break-in period. Further maintenance intervals depend on usage, mileage, and the specifications in the operating manual.

Many mechanical tasks such as tire changes, brake service, chain care, or gear adjustment can be performed by an experienced bicycle or e-bike workshop.

For work on the motor, battery, controller, or electrical components, Rockbike customer service should be contacted beforehand.

Use a soft cloth, a mild cleaning solution, and only a little water. The battery and electrical connections should be protected before cleaning or treated according to the operating manual.

Do not use a high-pressure cleaner. The strong jet of water can force water into bearings, connectors, and electrical components.

Rockbike grants a voluntary 5-year warranty on the main frame of the Rockbike Rumble.

The frame warranty applies to certain material and manufacturing defects on the load-bearing main frame and its permanently connected welds according to the applicable warranty conditions.

This is not a five-year warranty on the entire E-Fatbike.

The voluntary frame warranty does not specifically cover:

• battery and charger,
• motor, controller, and display,
• brakes and brake pads,
• tires and tubes,
• chain, sprockets, and gears,
• suspension fork and bearings,
• lighting and electrical wiring,
• seat bench and attachments,
• paint, coating, and optical signs of wear.

Statutory warranty rights may exist independently of the voluntary frame warranty.

Specifically excluded are damages due to normal wear and tear, accidents, falls, overloading, improper assembly, lack of maintenance, tuning, structural modifications, jumps, stunts, or use not in accordance with the intended purpose.

You can find the complete conditions on the page 5-Year Frame Warranty .

Yes. The voluntary frame warranty is in addition to the statutory warranty rights and does not restrict them.

Rockbike offers a 30-day return option in accordance with the currently valid return and cancellation conditions.

Please check the applicable conditions, the condition of the goods, the return process, and any possible costs for return transport before returning.

No. Please contact Rockbike customer service before returning.

An e-fatbike is a large shipment and cannot be returned like a normal package without prior arrangement. You will receive information on the further procedure after contacting us.

Send the Rockbike customer service the following information:

• Order number,
• Frame or serial number,
• as precise a fault description as possible,
• photos or a short video of the problem,
• information on when and under what circumstances the fault occurs.

Do not carry out any independent work on the battery, motor, controller or electrical wiring before reporting back.

Rockbike customer service assists in finding suitable spare and wear parts for the Rockbike Rumble.

For an inquiry, please have the order number, serial number, model variant, and a photo of the required component ready. The availability of individual parts may vary.

You can reach Rockbike via our contact page or by email at info@rockbike.de.

The currently available payment methods are displayed during the order process.

Depending on the country, currency, and order value, PayPal, Klarna, credit card, or other payment methods may be available.

Installment payment may be available depending on the country via a payment service provider offered at checkout.

The verification and approval are carried out exclusively by the respective payment provider. Rockbike has no influence on an acceptance, refusal, or the offered conditions.

Processing begins after a successful order and payment release. For payment methods with manual or external verification, the shipping release may be delayed accordingly.

Changes to color, delivery address, or order are only possible as long as the order has not yet been transmitted to the warehouse or the transport service provider.

Therefore, contact customer service as quickly as possible. A change cannot be guaranteed once shipping processing has begun.

Yes. An invoice or a corresponding proof of purchase will be created and provided digitally for your order. Please keep this for warranty and service inquiries.