Bionx electric bike kit fit
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Will a BionX fit my bike?

A BionX system will fit on most bikes and it' easy to determine if it will fit on yours. Some quick facts:

Let's check to be sure the BionX will fit

Wheel Size: The BionX works with 20", 24", 26", 700c and 29er wheels. To determine your bike's wheel size, look for some numbers printed onto the sidewall of your tire. On one side of the tire there should be a set of numbers something likes this: "26 x 1.5" or "700 x 35." The first number is the size of the wheel. 700c and 29er will use the same size BionX motor as they are in fact the same size.

Drivetrain Compatibility: The BionX is usable in the REAR wheel only. So, first take a look at your rear wheel. Does it have external gears or internal gears? Is it a single speed bike (just 1 gear)? BionX will not work with internal gears or single speed bikes. If you have multiple external gears you're all set!.


Rear Dropout Spacing: Now it's time to do a quick measurement. Remove your rear wheel (or just approximate if you really don't want to remove it) and measure the space that the wheel sits in. This is called a "Drop Out" measurement.

The BionX requires a width of 135 mm or 5.3 inches. Steel frames can flex a bit to accommodate a difference of 5mm or .2 inches. Aluminum, titanium, and carbon frames cannot flex much and have to be exact.


Let's check your cable lengths.

Take a look at some of the wiring diagrams below to check what will work best for your bike. Then use this guide to check if you'll need any extra extension cables.

Motor cable: Measure the distance (along frame) from where the rear of battery bracket will be to rear axle (on non-drive side of bike). Follow your brake or shifter cables for cleanest cable routing. The BionX default measurement for Motor to Battery cable is 23 inches.

Console (display) cable: Measure distance (along frame) from where the rear of battery bracket will be to where the console will be on the handlebars. Follow your brake or shifter cables for cleanest cable routing. The BionX default measurement for Console to Battery cable is 47 inches.

BionX cable extensions can be purchased and strung together in a chain to meet your needs:


BionX battery size

Where will you mount your battery?

There are two types of battery: "rear rack" or "down tube". The down tube battery typically goes where your water bottle goes whereas the rear rack battery slides into BionX's own proprietary rear rack. Some very small frames or frames with special shapes are too tight to fit a down tube battery. Take a minute or two to measure your frame if it looks like it might be an issue.

For 90% of BionX installations you can just use the hardware included with the kit. For some special situations you may need a more customizable way to mount the battery. Hose clamps work great and can be threaded right through the battery rail. This works especially well on recumbents where you don't find standard bicycle geometry.

Cable routing diagrams


BionX cable routing Standard
You probably wont need any extension cables if your bike looks like this.
BionX cable routing Step-through
If you use a rear rack system with your step-through bike you probably wont need any extension cables. The down tube battery mounted on a rear rack may need a motor extension cable.
BionX cable routing Mountain
If you mount a down tube battery on a seat post rack you will probably need a motor extension cable. Don't put the battery under the down tube, the suspension could compress on a big bump causing the wheel to crush the battery casing.
BionX cable routing Recumbent
In this setup you'll probably need a motor extension but not a console extension. Recumbents and trikes are tricky though so be sure to carefully measure everything before ordering.

BionX cable routing Recumbent 2
In this setup you'll probably need a console extension but not a motor extension. Recumbents and trikes are tricky though so be sure to carefully measure everything before ordering.