There are 7 sprockets -- each will fit the chain. The sprockets' sizes are 8, 12, 16, 20, 24, 28, 32 teeth. In this 4 sprocket to 3 sprocket combination, there are 12 possible gear ratios. The chain is realistically modeled. You may download for free a high-resolution render of the chain and sprockets to see for yourself the quality of the model.
This will be an excellent time-saver for those who wish to model bicycles!!
This was originally modeled in NURBS, but I have also included converted polygonal mesh in several formats. The NURBS geometry is also available in many popular formats.