Hmmm, never messed with that OS. I'm still using raspbian. My main problem is with wheels is that the only 14" diameter I can find are either way too heavy, or too narrow to keep from sinking because of weight. This sucker is going to have some mass to it. Aslo, I'm not willing to spend over a hundred bucks on cheap plastic. lol
When it comes to making wheels I've never decided to do it because there's only a few billion wheels on the market for robots and industrial machines. The only time I've ever seen where people make "wheels" is where they make their own hub/sprocket combinations for tracked vehicles and even a lot of that can be done with off the shelf chain sprockets. So I really don't see the reason to make wheels.
look at all these wheels!https://therobotsource.com/73-shop-for-wheels-tracks-omni-wheels-mecanum-wheels-for-building-robots#/
How fast is this robot going? Are we trying to do 35 mph or 3.5 mph?
You can get really large contact wheels 12" and higher from many suppliers if you're talking about precision, Aluminum billet wheels with duro70-80 rubber on them (think car tire hardness rubber). They're not cheap but they'll last foreverhttp://www.beaumontmetalworks.com/shop/category.aspx?catid=6
I got some of my wheels from my friends at Beaumont who I also get my sanding machinery equipment from.
I'm sure if you search you can find a 14" contact wheel.
Now if you're talking more of a pneumatic/offroad wheel than tractor supply as mentioned, Big R, MSC/Grainger has tons of wheels too.