Engineers are part of a team that brings a product to market, but not the sole part. Part are artists and part are marketers, and so on. The size of the wheels MAY be done by engineers, but it also may be dictated by marketers or artists. We don't really know. What we do know is Can Am is married to Kenda and the stock size of our tires are very odd and difficult to find outside of the Spyder/Kenda ecosystem. So, it could lead to the conclusion that tire and wheel sizing is dictated by marketers trying to bring Spyder owners back to the dealership for expensive servicing/tire replacement. Which is a common thing in the motoring world now-a-days.

To Kong, good job and rock-on.