cycle analyst tunnel vision

Cycle Analyst V3 Review

April 20, 2012

Update the Cycle Analyst V3 can be found on sale at Luna Cycle for $130. 

The Cycle Analyst is a well thought out battery monitoring device manufactured in Canada that is used in most of the high performance DIY electric bikes today.  Its core feature is to monitor how much amperage the battery has used, and determine what voltage the battery is putting out. It also serves as a amperage or speed limiter, and a speedometer. The Cycle Analyst allows you to ride and have a  solid  idea  of when your battery is going to die, or if there is something wrong with your battery, and set up limits where the cycle analyst will automatically shut your bike down if it hits user programmed  voltage limits.

The new Cycle Analyst adds the exciting feature of pedal assist, meaning the Cycle Analyst can determine how much you are pedaling, and then add power according to how much of a percentage boost you tell it you want. At the Tapei bike show last month where the v3 cycle analyst debuted, Justin set up a display that demonstrated how the Cycle Analyst was  able to determine how much “juice” the rider was putting out and then apply motor accordingly.  The Cycle Analyst gets this information from a cadence sensor built into the bottom bracket of the bicycle:

By addding pedal assist, the Cycle Analyst has the potential to make all DIY bikes more sophisticated and easier and funner to ride.

To test the new V3 on a road trip, Justin set up a test ebike and went on a 20 mile trip in Shanghai China to visit a friend of his, a fellow ebike rider Cellman.


For those who don’t know who Justin is, he is #2 on EB’s Most Influencial People of the Ebike revolution list. He is also the ringmaster of and

I have always remembered him for his epic Ebike ride where he rode an ebike built by himself on a 4000 mile trip across Canada:

Justin’s biggest contribution to the ebike world in my opinion has been the actual inventing and selling 0f  the Cycle Analyst. The Cycle Analyst has made it safer to run lipos etc, and has opened the floodgate for bunches of DIY builds.

I had the privilege of doing an ebike ride with Justin while he was visiting San Francisco late  last summer and he spoke of the possibility of doing a new and improved Cycle Analyst while we looked over the Golden Gate Bridge at sunset.  He said he would need 4 months of uninterrupted development time and he could make big improvements to the existing CA. Sure enough, Justin disappeared from the forums of Endless Sphere for around 6 months, and when he reappeared he announced the exciting new Cycle Analyst in this thread here.

Not only does the Cycle Analyst add pedal assist but adds many new features because of a brand new cirquit board which allows hook ups for temperature sensors and other good inputs:


With new and improved hardware, Justin is able to  use his wizardry to make a truly functional and versatile display:


As if the old V2 Cycle Analyst wasn’t enough of a game changer, the V3 adds so many more features and a lot more potential for later firmware releases. If you do buy the Cycle Analyst v3, especially an early release (beta avialable right now) be sure to buy the programming cable so you can change the software later as it progresses and upgrades.

My favorite addition is the cycle analyst is temperature monitoring and control. I think a temperature sensor has been long overdue on the Cycle Analayst, but rather than just display temperature, the new v3 will dial the throttle incrementally back as the motor, controller or battery gets too hot. This is a feature that until now was reserved for expensive EV’s like electric motorcycles and cars.

The Cycle Analyst is available now as a beta release , and will be released soon to the general public on the website. The price is around $160 ($40 more than the v2).


Eric has been involved in the electric bike industry since 2002 when he started a 6000 square foot brick and mortar Electric Bike store in downtown San Francisco. He is a true believer that small electric vehicles can change the way we operate and the way we think.

  • deVries

    Thanks for the info on the CA V3. Hopefully, the price can come down after the V2 is sold out. With electronic gadgets the trend should be downward even from previous versions as time goes on & sales increase.

    Suggested new price point, IMO, should be $99 for the V3 by 2013 or 2012 Christmas. 🙂

    • Admin

      good point,

      Except cycle analyst has no real competitor and they are serving a nich market (high performance electric bikes)…as soon as hobby king decides to make something that does what cycle analyst does for $35 you will see the price of the CA plummet. But since there is no real market for ebike accessories yet dont expect hobby king (or someone like it) to jump in the game any time soon.

      • mike

        Exactly the cycle analyst is over priced should be $80, a hobby king wattmetre + a cell log for bms is all you need if you know your stuff will do but the hk watt metre only goes to 60v atm.

        • ElectricBIke

          Yes thanks Mike,

          I know the cell log well which is a nice piece of equipment but haven not played with the watt meter yet. I will order one of those soon from hobby king and hopefully post a review of those two great pieces of equipment. I have heard some good things about the wattmeter. The other great option for battery metering is the speedict which uses bluetooth to connect through your android phone and uses the android for a read out.

          • mike

            search utube turnigy wattmetre there is a doctorbase review where you will see how accurate it is against a fluke metre ect its back lit blue as well itcant be beaten for the money

          • mike

            Dam sorry for multi posts, BTW i think we have a competer crystalite APm display i found one in us for $90 can post a link if its ok.?

          • ElectricBIke

            yeah sure post away.

          • Mikemail
  • I used the V2 Cycle Analyst on my electric sailboat – after 3 yrs succumbed to saltwater corrosion. Now wondering about the V3 – the Pedal Assist might even work well to ‘feather’ the prop to optimal boatspeed when sail power is available (thinking out loud). When is it expected to ship?

  • WarpedOne

    I fear it is to late to inclue into V3 but maybe a future release could have a secondary voltage input – a middlepack voltage. If it isn’t almost exactly half of the main battery voltage you’d know one of your cells is going weak and act before it destroys the whole pack.

  • ranjit

    price of the cycle

  • craig

    why not make the cycle analyst into a combined programmable bms so it can monitor individual cells and manage charging freeing up the end user to be able to build their own battery packs from cells and not have to worry about obtaining a matching bms and also forewarn the user to weak/damaged cells so they can be replaced in good time and keep performance at optimum

    • ElectricBIke

      That would be really sweet….

  • Clint Cooper