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Originally Posted by Kevin Kolodziej
I noticed something yesterday that may have the potential to be a huge problem. I took our new AndyMark omniwheel and put it on a shaft next to a new IFI traction wheel (both 6") - its not by much, but they aren't quite the same size. I went over to my other team and looked at the AndyMark trick wheel and IFI wheel (both 8") and found the same thing.
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Are they the same size when you put weight on the traction wheels?
I'd almost guarentee that the difference is a discrepancy between the tread being fully compressed, and the wheel sitting on the ridges of the wedgetop, causing the omniwheels to not contact the ground. Either that, or the OD of the wheel without tread is 6" and the tread adds 1/8-1/4" or so.