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It's just easier on the tire shop and the whole process in general.
If you want a 16" group buy, then maybe take it to the RSX forum (where you will have a larger response) and see just how many you could get there. Then AFTER we are done with this one, you could maybe propose (and organize) another GB for the 16's. This by No means is promoting or volunteering Phil's as the shop that is or will support a second GB for said 16's. But if all goes well this time he may be able to be coaxed into another.