Here is a set of freewheel mountain bike cranks made specifically for motored or electric bicycles. The cranks feature a specially made freewheel integrated into the drive side so that engine power can be ran through the cranks and not effect pedaling. These cranks are an exact copy of the model that can be bought at sickbikeparts.
This model is very accurate and can be used for simple render scene for your project or better yet they can be used as a place holder for your custom frame design, and you can be sure that everything will fit properly once you finally get to the manufacturing stage.
The cranks are modeled with Solidworks 2012 and rendered in keyshot 4.
The package includes a zipped file containing the original, STEP and .STl and assembly files of the following components: