Weighing up the pros and cons between buying a purpose built ebike versus an ebike conversion kit
If you are looking to join the ebike revolution, then you may be deliberating between a purpose built ebike and an ebike conversion kit. On one side, you’ve got factory-built ebikes that arrive ready to ride. On the other, you’ve got conversion kits that let you pimp up your existing (and much-loved) ride into a 21st century flyer. Both routes can get you cruising along with a smug grin on your face — but they’re not the same beast. Here are the key factors to consider when you’re choosing between a purpose built ebike or a conversion kit.
Cost
This is where ebike conversions can excel. Conversion kits can be cheaper upfront – particularly if you already own a good quality bike that you don’t want to let go. Purpose-built e-bikes, though, bundle everything together — motor, battery, frame, and electronics — which can push the price up. However, even though conversions can be cheaper, it is vital to go for high quality components.
Convenience
Purpose-built e-bikes are grab-and-go. Charge it, ride it, repeat. Conversion kits need installing, tweaking, (and sometimes swearing at YouTube tutorials). If you love tinkering, that’s half the fun. If you just want to ride, it’s worth considering a purpose built ebike, or finding a local bike mechanic to help with the fitting.
Performance
Purpose-built bikes are churned out en masse, with standard components. Conversions can can give you something extra — but performance depends on the kit, the battery, and how well it’s fitted. In the ebike conversion versus purpose built battle, purpose built might be more consistent, but conversions can be wildcards.
Handling
Weight placement matters. Purpose-built e-bikes tend to hide batteries inside frames and balance weight properly, but can also be clunkier compared to conversions. Conversion kits offer a great power-to-weight ratio, but can also impact handling. A badly balanced conversion can feel twitchy. A well-built one can feel amazing.
Safety
Factory e-bikes are tested as a system: brakes, frame, and electronics all designed to work together. With conversions, safety depends on your bike and your install. Cheap brakes and a powerful motor? That’s a bad combo. If you go the conversion route, quality parts are non-negotiable. Proper fitting is also essential, so if you don’t have any experience (or the right tools), then get help from a local bike mechanic.
Legality
Purpose-built e-bikes are usually sold road-legal out of the box. Conversion kits can be legal too — but it’s easy to go over power limits without realising it. In the ebike conversion versus purpose built debate, legality is simpler with factory bikes, but conversions just need a bit more homework. To understand what makes an ebike road legal in the UK read this article.
So which should you choose?
E-bike conversion kits can be a brilliant option, especially if you already love your bike and don’t want to start from scratch. They let you keep the frame, the fit, and the vibe — just with electric superpowers added. But not all kits are created equal, and buying the wrong one can turn your dream build into a wobbly nightmare.
For advice on how to choose the right conversion kit, read our next article.