What is the shipping cost of 2 Primo tires? Does this include the center core for mounting? If not, can the existing core on my chair be removed and used with the new tires?
These tires do not come with the rim. As long as your original rim splits into two pieces (a front and back), then you will be able to reuse the existing one from your chair.
As for shipping, if you add the items to your shopping cart, you can input the shipping zipcode in the Shipping Calculator section on the shopping cart page to see the shipping times and costs.