Help with finding 6 inch pneumatic wheels with a plastic hub

[Alex.q]

Originally Posted by Alpha Beta

http://www.castercity.com/eshop/10Ex...ic-casters.htm



These are some of the skinniest and lightest 6" pneumatic wheels that we have found. Skinny enough to fit into a swerve drive module if needed. Not sure what tread wear and traction would be like though.

Just checked these out online and found some issues.
1. how would you attach a hub?
2. More importantly, according to the site the wheels are

NOT to be used above 3 mph. For manual use ONLY.