When it comes to sustainability, bikes are superior to cars—no emissions, A to B transport, and fitness in a two-wheeled contraption. But about electric bicycles?

Unlike traditional bicycles, which are powered by legs alone, e-bikes—and those who ride them—get some help from a rechargeable battery. And while they do emit some carbon (roughly 2.5 to 5 grams per mile), one study found e-bikes have the capability to reduce car CO2 emissions by 24.4 million tonnes. In short, an e-bike is an environmentally-friendly option for getting uphill or across town.

In this case, though, eco doesn’t mean cheap. Fortunately, a hack exists in the form of an e-bike conversion kit.

If you’re not quite ready to make a $1,000+ investment—and you’re already the owner of a good old-fashioned bike—you can enjoy the benefits of an e-bike without dishing out for an entirely new method of transportation. E-bike converters are a convenient and much cheaper way of transforming your current bike into an electric one with batteries, motorized wheels, controls, and more. Upcycling is always a winning option.

Here, four e-bike conversion kits to help you upgrade your ride.

Transform your beloved bicycle into a speedy e-bike in under an hour with this top-rated conversion kit. It includes a drive motor, front wheel, battery pack, and video installation assistance.

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Enjoy electrified rides in all types of weather with the help of this waterproof conversion kit, which works on either your front or rear wheel. And, because we’re in tech territory, the LCD display will alert you when it’s time to charge up again.

This kit comes with everything you need for a full conversion of your rear bike wheel. Those with a need for speed, rejoice: Riders can use up to seven different speeds with Voilamart’s pedal assistance system.

This e-bike conversion kit has an alarm lock function, so you can click, park, and go about your business. Plus, the entire system has waterproof cables. Secure your ride and walk confidently away—rain or shine.

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