There were a number of things I used up on my long tour, wore out, or clothes I shrank out of. (That's a nice problem to have if you're carrying as much extra weight as I do!) Most of those were replenished or replaced on the road, with the remaining few things resupplied by mail from home; food, salt pills, fuel, rear tires, chain. Oh, and money; thank goodness for ATMs! I carried spare brake pads that went on the bike after 3,000 miles. I only had to order one extra part, a cable for my bar bag mount. When you're traveling a few hundred miles a week, I tend to notice things are getting low or worn out and have a chance to replace them within a week or two.