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Frequently Asked


First, you need to confirm your rim size, we only provide 26" and 28" (29", 700c), and the rim width is 1.5-1.95 inches, if it is ES Everest MTB 26", the rim width is 1.95-2.35 inches. You can find your wheel size on the tire side of your existing wheel. If you are not sure about your rim size, you can contact us at support@kirbebike.com.

European Tire and Rim Technical OrganizationNowadays, bicycle tire sizes are all marked according to ETRTO (European Tire and Rim Technical Organization) standards. However, older English and French tire size dimensions are still used as well. The ETRTO size specification 37-622 indicates a width of 37 mm and the tire inner diameter of 622 mm.

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.

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 place great emphasis on quality control from the start of production to the end, and each kit is rigorously tested before it leaves our store. For complete kit purchases and any purchases that include batteries, our team will build, test and ship your kit within 2-7 business days. For smaller items, such as accessories or components, our team takes 1-5 business days to process and ship your item. For more details, check each kit's product page for the latest updates on availability, or email us at support@kirbebike.com.

Free Shipping to Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, United Kingdom, Australia and the United States.

We have a 7-day return policy, which means you can request a return within 7 days of receiving the item. To be eligible for a return, your item must be in the same condition as the item you received, unworn or unused, labeled, and in its original packaging. You will also need a receipt or proof of purchase. To initiate a return, you can contact us at support@kirbebike.com. If your return is accepted, we will send you a return shipping label along with instructions on how and where to send the package. Items sent back to us without a prior request for return will not be accepted. You can always contact us at support@kirbebike.com with any return questions.

We stand by the quality of our products: 7-day money-back guarantee on all orders. Please contact us to return items for a refund: Lifetime technical support. Contact support@kirbebike.com for assistance from our team of experts: 1-year extensive warranty on all retrofit kits. See the Warranty and Returns Policy for details.

If there is a problem with the product during the warranty period, we will find out the problem based on your video and pictures, and then provide replacement parts for free. If the problem cannot be solved with parts, we have after-sales service in Europe and the UK to repair the product.  If there is a problem with the product outside of the warranty period, we are also willing to help you find the problem, but the cost of parts or repairs will be paid by the customer.

Our transportation is generally random through GLS, DPD, and UPS. If you want to specify the transportation channel, please note the information when placing the order.

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