Just recording some stats here for easy future reference:
USPS - Calculate Postage
From: tennesse-37050 (houston
77001 $58 from this zip via USPS, $38 via UPS)
To: morristown NY 13664
weight: 13 lbs/tire
size: 22.5 x 22.5 x 6.5
1 tire: $14.03 Parcel post 6 days
2 tires: $19.80
So, it's cheaper to tape 2 tires together.
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From
85701 Tucson
$30.75 USPS parcel post per pair
$26.63 UPS per pair
From 85736 AZ to 13679 NY
$30.75 USPS parcel post per pair
$43.75 UPS per pair