wheels

Where can I buy 8x2 pneumatic wheels with a 5/8 axle and a key way?

http://www.skywaywheels.com/2002/products_004.htm

Closest I could find on the Skyway site.
You might have to look elsewhere.

www.skywaywheels.com

not all of their stock is listed on the site so you have to give them a call, but 5/8" bore is fairly standard. They can put a keyed hub into a wheel that is supposed to come with freebearings.