Frequently Asked Questions

Most likely, yes! Our kits are designed to be universally compatible with the majority of standard bicycles, including mountain bikes, city commuters, and folding bikes (like Brompton). Before purchasing, simply check your bike's wheel size and bottom bracket type. You can find detailed sizing specifications on every product page.

es. Our standard commuter kits (like the EZ Rider) feature a 250W motor capped at 15.5 mph, making them 100% road-legal in the UK and EU straight out of the box. For those purchasing higher-powered kits (e.g., 1000W) for private land use, many of our smart systems include a "Limit Mode" that can cap the speed and power to legal limits with just the push of a button.

Not at all. Our kits are built with DIY in mind. Most riders can completely convert their bikes in under 40 minutes—some in as little as 20 minutes! To make your conversion completely seamless, every single kit ships with its full toolset, absolutely free. We also provide clear, step-by-step instructional videos.

Here we have two more common wheel sizes that are in fact, the same! The standard modern road bike wheel has an ISO diameter of 622 mm and is referred to as 700c.

A 29-inch wheel is the same as a 700C wheel most of the time. The “29-inch” designation uses the nominal sizing system, while the “700c” designation uses the French sizing system. What is this? Both wheels have an ISO system measurement of 622mm and are effectively interchangeable.

The 36V 250 W kits can hit 25 mph on flat ground with minimal pedaling, but they work best when pedaling is required on hills, boosting your pedaling. Perfect if you want to add power to your ride at an affordable price. Cut your commute time by 25%, level hills by 50%, and put a smile on your face. The 48V 1000W kit can go up to 50 mph with minimal pedaling. Requirements for bicycles with a top speed of more than 25 km/h may require additional permits and are subject to different traffic regulations. It's more power than you might need. But it's fun and gives you peace of mind that you can get out of any tricky situation faster.

36V universal battery replacement has a range of 20 - 25+ miles. The 48V battery has a range of 25 - 40+ miles. Mileage rates are based on a 170-pound rider riding a 30-pound bike on a flat paved surface, with no wind, using the motor, and no pedals. Your mileage may vary, but most people get more miles than advertised. For best mileage, we recommend pedaling with the motor on.

Absolutely. We engineer our kits to withstand the elements. Our batteries feature an IP65 waterproof rating, and our motor controllers are fully resin-potted. This heavy-duty sealing shrugs off heavy rain that typically damages standard bagged controllers, giving you all-weather riding confidence.

Most of our electric bike conversion kits can reach a top speed of 25 Km/h, but the 1000W model can reach speeds of 50 Km/h. These speed limits are primarily set by the laws governing bicycles. Requirements for bicycles with a top speed of more than 25 km/h may require additional permits and are subject to different traffic regulations.

We offer free shipping on all UK orders, with delivery typically within 3–5 business days. International orders are shipped via trusted carriers and usually arrive within 5–14 business days, depending on the destination. For e-bike kits, the conversion kit and battery may be shipped separately in fully tracked packages to comply with transport regulations and ensure safe delivery. For more information, please check the product page or contact us at support@kirbebike.com.

Yes! We provide 100% free shipping for all orders delivered within the UK. We also deliver globally to the US, EU, Canada, Australia, Japan and more international regions. Shipping fees for overseas orders will be transparently calculated at checkout.

We offer a 7-day return policy, which means you may request a return within 7 days of receiving your order.

To be eligible for a return, the item must be unused, in its original condition, and returned with all original packaging and accessories. Proof of purchase is required.

To request a return, please contact support@kirbebike.com. Once your request is approved, we will provide return instructions and the appropriate return address.

Items returned without prior authorization will not be accepted.

If you have any questions about returns or refunds, please contact support@kirbebike.com.

We stand behind every KirbEbike conversion kit with a 7-Day Return Policy and a 1-Year Global Warranty. Enjoy FREE UK shipping, fast worldwide delivery, and dedicated technical support whenever you need it. For returns, warranty claims, or assistance, please contact us at support@kirbebike.com.

If your product develops a manufacturing defect during the warranty period, our technical team will first assess the issue based on the photos or videos you provide. Where applicable, replacement parts will be supplied free of charge. If the issue cannot be resolved remotely, eligible customers may receive repair service in accordance with our regional warranty coverage.

For products outside the warranty period, we are still happy to provide technical support and troubleshooting. If replacement parts or repair services are required, the associated costs will be the responsibility of the customer.

We ship orders through trusted carriers, including DHL, FedEx, TNT, DPD, GLS, and UPS, depending on your destination and the fastest available service. If you have a preferred shipping carrier, please leave a note at checkout or contact support@kirbebike.combefore your order is shipped.

Lithium e-bike batteries should be “topped off” after each use. The e-bike controller and battery management system (BMS) that come with your battery will regulate the battery discharge to ensure that it is not fully discharged. The charger will ensure that the li-ion battery is never over-charged. Disconnect the charger when the battery is fully charged.

Of course you can, if you want a larger capacity battery, you can buy another battery separately.

1) Turn the battery switch to "OFF".2) Plug the battery charger into the wall socket.3) The green light on the charger means "charged". Red light means "not charging" or "charging".

For the DP battery, just screw it into the existing hole on the down tube. Check that there is enough space for the battery and cables below. For JL batteries, remove the existing battery and replace it with the one included in the kit. Once the DP or JL is installed, simply slide the battery into place and lock it.

All kits come with installed tires so you can get up and running quickly.1. Loosen the bolts and remove your old wheel2. Install new electric wheels3. Tighten the bolts. Check that the wheels are securely fastened and spin freely

Install the disconnected sensor. Please check that the brake cables are in good condition and the threads are straight. Sensors can be mounted near the brakes or handlebars. Note that the sensor arrow needs to point in the direction of the handle.

Yes, all wheels are disc brakes compatible with standard spacing and 6-bolt rotor attachments.All of our wheels are also rim brake compatible, giving you the option that best fits your bike!For instructions on how to install rotors on your e-bike, check out the video below: https://www.youtube.com/watch?v=YplpStKdNsg&list=TLGGoPuFMNJYprAxMjA0MjAyMw&t=79s