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Veiw Acceptable & Non-acceptable Hub Styles

You must measure your hub accurately in order to ensure that your adapter fits properly. The correct way to measure your hub. Digital Caliper, Dial Caliper or Micrometer. Digital calipers are available at most hardware stores for around $20.00 or you can have the local bike shop measure it for you.
A vernier caliper is, of course, another tool that can be used to measure your hub.

The large bolt circle adapters we produce are designed for flat cylindrical hubs that measure between:1.520"-1.528"

The sprocket adapters are for wheels that have 36 or 48 spokes total. Not 32..
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Measure Hub for manic mechanic motorized bicycle adapter Hub Styles (Click on picture above to view)

The MANIC MECHANIC sprocket adapters are for wheels that have 36 or 48 spokes total. Not 32..

Count the spokes on one side of the wheel...you should have 18 or 24.

The large bolt circle adapters we produce are designed for flat cylindrical hubs that measure between: 1.520-1.528" O.D.
Between 1.520"-1.528" OUTSIDE DIAMETER IS OK

We also offer custom freewheel conversion reducer bushings, for freewheel hubs that are smaller. $30. each
See: Freewheel Conversion Reducer in (Adapter & sprocket Combo's) in top navigation menu.
The minimum diameter is .375" for custom reducer bushings.

You must measure your hub accurately in order to ensure that your adapter fits properly. The correct way to measure your hub. Digital Caliper, Dial Caliper or Micrometer.
A vernier caliper is, of course, another tool that can be used to measure your hub.

You can not use a tape measure to

measure your hub for an adapter.

You can not eye-ball it with a tape measure.

Circumference measurements with a tape are not acceptable either.