Before I dive into the actual upgrade, I should explain a few things.

My ebike is a Cannondale Canvas Neo with a Bosch Performance Line motor. I'm not sure which generation the motor is, gen2 or gen3 I'm guessing.

Pretty soon after getting the bike I installed the Volspeed V4 tuning box. it enables me to extend the level of assist the motor offers from the default 15.5mph to whatever I want. I typically run it at about 20mph assisted for day to day riding. I've been riding (and racing) bikes all my life, so the standard 15.5mph just feels too slow. This bike retails in the US with a 20mph assist level, so I know it's perfectly safe.

I opted to upgrade the Purion to the standard Kiox display because the Volspeed tuning box doesn't support the Kiox 300 or 500. They do make a kit for those displays, but I didn't want to have to upgrade the display AND the tuning box.

The Upgrade

This is what the old and the new displays look like installed. The Purion is a bit pants!

The Purion is a very basic two-tone display with only two control buttons.

The Kiox is a full colour feature-rich display, with a wired remote control where the Purion used to be.

The first thing you need to do remove the motor housing. This requires the non-driveside crank to be removed.

First remove the crank bolt with an 8mm hex key, then use a good quality crank puller to remove the crank. If you don't have a crank puller stop! You won't get a crank off undamaged without one.

Remove the crank bolt with an 8mm hex key, it'll require a lot of force, turn the hex tool counter-clockwise.

Use a crank puller to remove the crank arm. Don't try to bodge this: If you don't have a puller, get one. If you damage the crank/bottom bracket splined interface, the crank will forever keep coming loose!

Once the cover is off you get access to the wiring, and in this instance, the Volspeed Tuning Box.

The Motor with all the cables exposed.

The little box tucked up in the housing is the tuning box.

I knew that to fully install the Kiox display there was a lot more dismantling to be done, so before getting too deep I plugged the new display in and checked it worked.

The old display is disconnected and the new one plugged into the motor. Turned on, and yep, it's working!

Once I'd confirmed the new display was working, I disconnected it, removed the battery and set about removing the old display.

With the battery out, I could see that all the cables run under two black strips of plastic. To get these, and so the old display cable out, removing the battery connectors was required.

The plastic strips under which all the cables are routed.

The upper battery mount which had to come out.

The small bolts that hold the battery mounts in place.

The lower battery mount removed

With the battery mounts and plastic strips removed, the cable for the old display was exposed and easy enough to get out. I had to remove the cable guide in the frame to get the cable plug out, but again, easy enough.

The cable for the display pops out of the frame here, with a neat cable guide that had to be removed to allow the cable plug to exit the frame.

The cable and old display was now completely removed, time to install the new Kiox! This is where the first problem (and only) occurred.

The Kiox mounts to the top of the fork steerer in place of the stem cap. An M6 bolt passes through the display mount and screws into the star-fangled nut that's installed in the top of the steerer tube. Problem: My bike didn't have one! Instead it used a steerer bung, and the bung used a much larger bolt to attach the cap. Balls!

The steerer bung and top cap. No star-fangled nut!

This was where working on bikes for over thirty years comes in handy... I have a HUGE spares box. So a star-fangled nut was soon located and installed.

Star-fangled nut installed

From here in it was just a matter of installing the display, threading the cable through the frame, plugging it in and putting everything back together.

In total the job took about an hour. It's pretty simple to do, just requiring a bit of basic mechanics. Tools needed were a few hex keys, crank puller, star-fangled nut installer and (ideally) a work stand.

The new display is really nice to use. Lots of great features and a lot of data. It can be connected to your phone using the Bosch eBike Connect app, and can even do route guiding via your phones GPS.

You can see a gallery of the process here.