Cytronex

Overview

Cytronex is a British brand that designs and sells electric bike conversion kits for existing bicycles, including road, mountain, folding, and Brompton-style bikes. The kits add pedal‑assisted electric drive to standard bicycles, allowing riders to upgrade without buying a new ebike. Cytronex is positioned as a premium, UK‑designed conversion system, emphasizing compact, lightweight components and compatibility with a wide range of frames and drivetrains.

History

Cytronex was founded in 2005 by Mark Searles, who began developing electric bike technology with the goal of creating ebikes that visually resembled standard bicycles. In 2008 the company produced some of the world’s first ebikes with disguised assistance, including a NiMh battery pack shaped like a water bottle. In 2016 Cytronex launched the C1 conversion kit, which earned multiple patents and industry recognition, and in 2019 it introduced dedicated kits for Brompton folding bikes. The company has since expanded its premises and product range, including new thru‑axle kits and related tools such as the SMART LEVER tyre‑fitting tool.

Product Lines

Manufacturing

Cytronex systems are designed and assembled at the company’s base in Winchester, England. The brand emphasizes British design and engineering, while specific component manufacturing (such as motors, electronics, and batteries) is outsourced to external suppliers. Final kit integration and quality control are handled in‑house before distribution.

Notable Products

• Cytronex C1 Kit - Mid‑drive conversion kit with a patented gear‑tooth sensor for fast response and road‑legal assistance.
• Cytronex Brompton Kits - Compact electric conversion kits specifically engineered for Brompton folding bicycles.
• Thru‑Axle Conversion Kits (up to 12‑speed) - Rear‑hub kits designed for modern bikes with thru‑axle rear dropouts and wide‑range cassettes.
• SMART LEVER tyre tool - Hand‑held tool for quickly fitting and removing tight bicycle tyres without damaging rims.

Reputation

Cytronex is generally regarded as a technically advanced and well‑engineered conversion‑kit brand, particularly among enthusiasts who want to electrify existing bikes rather than buy new ebikes. Its Brompton‑specific kits are often praised for performance that rivals or exceeds factory‑built Brompton ebikes, though some users note the relatively high price and complexity of installation. The company’s focus on patents, compact design, and UK assembly contributes to a reputation for innovation, while limited availability and niche positioning mean it remains a specialist rather than a mass‑market option.