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I think it's silly to hang a G-614 under a trailer as a spare. But others may differ. A brand new marathon is a fine spare, considering many, many people roll marathons for many thousands of miles and do just fine. I kept mine, it's still brand new, and I still have total faith in it as a spare.
The 2 things I made this decision based on, is number one: It has never been used, hopefully never will be used, and if it is used, it will only be on for as long as needed to get the flat G-614 repaired or replaced at the earliest opportunity.
Number two: Having a slightly different sized tire on a non-drive axle is NOT an issue (I worked in the tire industry for quite a while.) for spare use. Left on for long distances, they could possibly wear at different rates, but this would never be an issue if used as a spare. The two tires are independent of each other and totally free to spin at their own rate based on their own circumference.
Tread differences also mean nothing.
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