Regarding rimlock: I don't feel comfortable not running one, so that's why I use one. Jeff Fredette still uses one as well.
Yes, I'm allowed to have tires pre-prepped with greased up tire balls. I'm taking enough tire balls for 4 tires (2 rear, 2 front) plus spares to Chile so that the new tire will be ready to go. My goal is 4-5 minute tire changes.
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