So far models available in the UK have all been single-speed models but the Zehus website suggests versions that can take 4, 7 or 9 derailleur gears also exist. It is a gearless rear hub system that can be purchased both as a retrofit kit and on certain ‘off the shelf’ e-bikes - we have tried it on both the incredible Hummingbird Electric and the latest much improved version is fitted to the impressive Vello+. The Zehus system appears to be going strong though. ‘All in one’ kits – with all the elements required to add electric assist to a bike in a single wheel hub – were a growth area a decade or so ago, with new designs regularly coming along. Dillenger Samsung Power 2.0 £599 (Best value) We concluded 'In short, the Boost is a uniquely simple offering, ideal for both leisure and sport riders who want a bit of assistance whilst keeping their bike light and with riding characteristics as little affected as possible by the addition of the kit.' The semi-automatic power delivery was generally smooth and effective though the want of a bit more power up steeper hills was our only real criticism. At the time of writing it was limited to 700c and 26" size wheels with derailleur gears (ie it's not compatible with hub geared bikes). The downside is it's relatively limited compatibility when it comes to donor bikes. There is just a single wire run from the fame mounted 'bottle battery' to the rear hub motor. It does that by integrating the sensor into the rear wheel, using a wireless handlebar display and by keeping the kit's weight in the optimal position on the bike so that it doesn't affect handling. Launched in 2022, the LaVita Boost rear wheel hub motor system is both one of the easiest to fit kits out there and one that gives the most 'bike-like' ride. There is also a Brompton specific option and a tandem option.Ĭheck out our review of the Cytronex e-bike conversion kit and also our review of the Cytronex Brompton e-bike conversion kit. In addition to the kit, Cytronex offer complete bikes from the likes of Cannondale, Whyte and GT. Diagnostics in the smartphone App allow Cytronex to diagnose an issue from a log sent anywhere in the world.Īt 3.2-3.6kg depending on spec it is also one of the lightest retrofit options out there. This means you can also monitor charging - a very useful feature at a coffee or lunch stop. The sensor has a new neat and compact chainstay fixing for 2023.Īlong with the ARCC and Pendix systems this is probably the highest quality system featured and includes impressive details such as a marine-grade stainless steel mounting mechanism and Bluetooth functionality that, via the brand new smartphone /tablet app, lets you not only alter the power of the five motor assistance levels but also monitor the exact charge of the battery even when it is off the bike. The unique patented Cytronex sensor senses the sprocket gear teeth which means that no brake switches or speed sensors are required. The front hub motor may look conventional enough but a plethora of original design features include a quick release bottle battery, a simple but highly functional handlebar mounted ‘Boost Button’ and a sprocket movement sensor mounted out of the way on the chainstay. The Boost Button has been improved since our review – now offering 5 power levels which can be changed by pressing left or right.
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