Cytronex electric bike conversion kit review: Engineering done right

Cytronexis a small British brand, established in 2008, that lays claim to being the first company to create an electric bike that, in the founder’s own words, “looked like a bike”. 

Nowadays, some 15 years later, its attention has long since turned toward making aftermarket electric bike conversion kits. These kits, from both Cytronex and elsewhere, are an immensely popular, fast-growing segment of the bike industry as people look to add power to their existing bikes. The even faster-growing ebike market has transformed the way many people around the world travel, but the initial cost can be high, so converting a bike you already own is a promising proposition. You can continue to ride the bike you already know and love, with a smaller upfront cost, and in a less wasteful way than buying an entirely new bike and leaving the old one to rot in the shed. They offer something of a win-win-win, really, so it’s no wonder that they’re popular. 

Specifications: Cytronex electric bike conversion kit

Price: Approx £1000, depending on specs

Battery size: 198Wh

Power: 250W motor

Modes: Five, customisable

Motor position: Front hub

Upon requesting to review a Cytronex system with a view to seeing if it’s worthy of inclusion in our guide to electric bike conversion kits, the company’s founder got in touch and offered the Brompton T-Line; the uber-lightweight folding bike from the British folding bike experts, which the brand had recently converted. Having read our editor Peter’s positive Brompton T-Line review, I couldn’t say no.

A silver Brompton T-Line, converted with the Cytronex e-bike conversion kit, leans against a brick wall

The Cytronex-converted Brompton T-Line (Image credit: Josh Croxton)