Originally Posted by Pugga
Get the shipping quote and get your money up front. I wouldn't ship anything until funds cleared my accound. Fastenal would ship something that large. I'm sure UPS would also but it'd be pricey. Google search 'logistics' for freight companies. It will be much cheaper if they pick-up/drop off somewhere with a loading dock rather than a residential location.
You can check out LTL carriers (less than truckload) that have operations at your location and the destination, like Roadway, ABF, Conway for example. They don't really deal with residential pick up and delivery. So...
You would do a "dock drop" at the local terminal, and then specify a will call for the destination, and the buyer would go pick them up at the destination terminal.
But these operations use forklifts...and forklifts can do a lot of damage, so really good packaging or crating for round, heavy things like this is important. You could stick them in four individual boxes (use new boxes that fit the wheels very well with minimal slack space, and put extra cardboard inside to reinforce the emptry corners and protect the wheels' edges), or one crate.
But that's a lot of effort and UPS may still be easier...