Fork Compatibility

Our front kit was designed with maximum compatibility in mind, but there are a few features to double check before purchasing. The main requirement for our kit is a steel fork with 100mm spacing and 10mm dropouts. Check out the info below for more information on how our kit fits your bike.

  • Steel Fork

    Rigid forks are usually made out of steel for strength and safety. Front hub motors like the one used in our kit create additional force on the fork dropouts, but steel forks are strong enough to accommodate these extra forces safely. Double check your fork material by holding a magnet against your fork. If the magnet sticks to the fork, it is made of steel and can be used safely with our motor.

    Sometimes bike manufactures use aluminum or carbon to reduce weight. If your fork is any material other than steel, or if it is a suspension fork, you must use the included torque arm during installation. Check our installation guide for more details on how to install your torque arm correctly.

  • 100mm Fork Spacing

    Fork spacing, sometimes referred to as O.L.D. (Outer Locknut Distance) is the distance between the inside of your fork dropouts. Our kit is designed to fit 100mm spacing, which is the most common standard. 

    Some vintage and folding bikes have a narrower fork spacing (90mm, 74mm), and some newer mountain bikes and fat bikes have wider spacing (110mm Boost, 135mm). Our kit is not compatible with any of these alternative standards.

  • 10mm Fork Dropouts

    Fork dropouts are the bottom section of your fork that holds your front wheel’s axle. Our hub motor axle is designed to fit into dropouts with a 10mm opening. This fits the majority of bikes, but double check before ordering.

    Some older forks have a 9.5mm or smaller opening, and some newer mountain bikes and road bikes use 15 or 12mm Thru Axle. Our kit will not fit on a Thru Axle fork, and will require some modification with a file to fit a dropout smaller than 10mm.

Other Compatibility Considerations

The three fork specifications above are the most important factors for compatibility. You must have either a steel fork or torque arm for safe installation, and the fork should be the correct size for the front hub motor. These other factors are relevant to compatibility, but can be solved using adapters or other solutions.

  • Hand Brakes

    Our motor wheel has mounting points for a disc brake rotor, and a braking surface on the rim for rim brakes. We recommend either disc brakes or rim brakes to provide enough stopping power for the higher speeds of an e-bike.

    For bikes with only a rear coaster brake, we recommend you speak with your local bike shop about installing at least a front rim brake.

  • Water Bottle Bosses

    Our battery is designed to use standard water bottle mounting points to attach to your frame. This is a set of two mounting points spaced 64mm a part somewhere on the frame of your bike, usually located on the top of your downtube or the front of your seat tube. 

    If your bike does not have these mounting points we offer a Battery Mount Adapter to attach the battery to your frame.

  • Square Taper Crankset

    Our Pedal Assist Sensor is designed to be used with square taper or one piece cranks.

    It may also be compatible with other types of cranks, but if it doesn’t fit your crankset you can use our PAS Adapter or run the system with just the throttle.

  • 22.2mm Handlebars

    Our optional throttle is designed to fit a standard 22.2mm grip diameter handlebar. This is the common standard for almost all handlebars other than drop bars on road bikes.

    If you have a 23.8mm drop bar, you can use an accessory adapter or run the system with just PAS.

Related Products