Quote:
Originally Posted by Greg Needel
http://www.andymark.com/product-p/am-2609.htm
This part is what you need. All the larger wheels made by AndyMark and vex both use a 1.875 bolt hole circle for attaching sprockets and gears. The plate I linked to has the right hole pattern to bolt to your vex wheels and the center is setup for one of the standard tetrix hubs. You could easily make this part if purchasing is not an option.
Greg
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This won't work for the 4" Vexpro mecanum wheels, they are the odd ones out since they're so tiny. The drawing shows their bolt circle to be 1.125".
http://content.vexrobotics.com/vexpr...g-20140926.PDF
You could drill a set of holes in the AM adapter plate that match the Vexpro wheel bolt circle, but getting them concentric with the axle would be a little bit tricky.