HOW TO CHECK THE COMPATIBILITY OF YOUR BIKE WITH A PEDAL MOTOR KIT?
Tutorial: How to Measure the Length of the Bottom Bracket of Your Bike
To determine if you can install a pedal engine kit on your bike, it is essential to measure the length of the bottom bracket. Follow these steps :
Turn your bike: Place it so that the wheels are in the air and the frame is stable.
Measure the length of the bottom bracket : Use a ruler to measure the length of the bottom bracket on the frame. Make sure not to include external bearings in your measurement (see photos below).
There are several standards for bottom bracket lengths :
Standards compatible : Some allow you to mount any engine in our range (BBS01 BBS02 BBSHD 68mm).
Specific standards : Others limit the choice to a single engine (BBSHD).
Measurement of a 68/73mm Hollowtech external bearings bottom bracket
To properly measure a bottom bracket with external bearings type 68/73mm Hollowtech, follow these steps :
Identify the area to be measured : You need to measure only the cylinder of the frame (the part between the arrows in the photo above).
Ignore the external bearings : Do not take into account the external bearings (the gray part in the photo).
Length measurement: Use a ruler to measure the length of the frame cylinder.
The length must be between 68mm et 73mm.
Engine Compatibility:
If your measurement is between 68mm and 73mm, all our pedal motors will be compatible with your bike (BBS01 BBS02 BBSHD68mm).
Carbon frame
If your frame is made of carbon, it is also important to check the outer diameter of the casing (see instructions at the bottom of the page).
Follow these instructions to ensure accurate measurement and compatibility of your bike with our crankset kits.
Measurement of a bottom bracket Pressfit Type
In this case, the bearings are inside the frame. You need to measure only the cylinder of the case (the part between the arrows in the photo).
Fat bikes often have bottom brackets longer than 73mm.
If the length of your bottom bracket is longer than 73mm, only the BBSHD motor will be compatible with your 100mm or 120mm BBSHD bike (100mm in the photo).
Depending on the size of your bottom bracket, your bike will be compatible with certain bottom bracket motors :
- 68/73mm case: compatible with all our crankset motors
- Case greater than 73mm: compatible only with the BBSHD crankset motor
Another measure is needed in order to determine the compatibility of a pedal engine. This measure concerns the distance between the centre of the bottom bracket and the lower stay of the frame’s rear triangle. This measure should above all be carried out for bicycles with original wide tires greater than 2.6''. On these bicycles, the shrouds may come into contact with the engine. This may prevent the installation of the crankset motor or limit the diameter of the primary transmission plate. It is necessary that the distance between A and B (on the diagram opposite) either greater than 64mm if you want to be able to install a BBS01 or BBS02 pedal engine. For the installation of a BBSHD pedal motor, the distance AB must be greater than 69mm.
Note however that if the distance A-B is slightly greater than the values mentioned above, it will be possible to add one or two housing spacers in order to slightly offset the motor outwards so that it no longer touches the stay.
In the photo above, the case diameter is 63.42 mm. Installing the pedal motor will not be possible..
Outer diameter of the bottom bracket (case of carbon bicycles) : If the frame of your bike is made of carbon, it is possible that the outer diameter of the bottom bracket is too large to allow the insertion of the crankset motor. The outer diameter of the bottom bracket must not exceed 61mm.
The ISCG legs: On many freeride and enduro mountain bikes, you will find welded legs on the frame. These are the ISCG fastenings for a possible rear derailleur. If your ATV is equipped with these legs, you will need to remove one by cutting or filing it. Note that the use of an anti-derailment plate will properly replace the anti-derail.
ISCG tab to be removed
