BionX Bike Fit

The BionX system with the standard wires will fit any fully sized bicycle with a dropout width of 13.5cm. For a guide to checking your dropout width, see the bottom of the page.

The first step is to print the BionX battery template

Most people install the battery on the water bottle holder or on the rear rack. Move the battery template around the bike keeping in mind that any installation besides the water bottle holder and rear rack will necessitate custom installation which is not recommended as it can lead to numerous problems.

The next step is to tape the console template to an open place on the handlebars. The arrow should point to the front of the bicycle and the optional throttle, if purchasing this option, should be in easy and comfortable reach of your thumb with your hands resting on the handlebars. If your handlebars are cluttered with lights or shifting levers, you may have to install an additional accessory bar.

Bellow is a picture of a properly installed console with good clearance and an easy to reach throttle.

Use the console template to gauge how much space your handlebars have.

When you have decided upon the position of the battery and console, tape the folded part (marked TAB) of the battery to the frame. Then tape one side of a roll of string or thread to the part of the battery marked with an X in a circle. Then attach the string along the frame and up the handlebars and connect to the circle with an X on the console. Measure the string length for your first measurement. This first measurement is called D1. The next step is to take another piece of string and tape one end to the circle with the X on the battery. Attach the string along the frame to the end of the axle of the future motorized wheel. This second distance is D2. When measuring, add at least two inches to each measurement in case you need to adjust your handlebars higher or encounter any other additional problems. The standard wires have a D1 length of 23 inches and a D2 length of 47 inches. There is the option of 12 and 24 inch extensions for the length D2 which are a less expensive option than custom cables.

Wheel Size

To determine the wheel size, examine the sidewall of your tire. On one side of the tire there should be a set of numbers, one number x another number. The first number is the size of the wheel. The pictures below are two examples.

Freewheel Selection

The BionX motorized wheel accepts 7, 8, or 9 speed freewheels. The kit comes without the freewheel and it will have to be installed by a local bicycle shop. The wheel uses a standard reverse thread installation.
The BionX motorized wheel fits in a standard (13.5 cm) rear dropout.

To measure your dropout width, remove the wheel and use a ruler to measure the distance between the inner attachment points of the rear wheel as shown in the picture.