I'm not sure there is a reason to switch to 15" wheels/tires, and pay for new wheels, if the result is still LR-D tires. In the past, the default tires were 14-inch Marathons (LR-C). The reason for the switch to 15-inch was that it was the only way to get LR-D Marathons. Now that you can get LR-D in a 14-inch Endurance tire, that should be a good choice unless you feel the need to go to LR-E.
Incidentally, 15-inchers provide only a tiny amount of increased road clearance - less that 1/2 inch, if I recall - so that doesn't justify a change.
Or have I missed something?
Bill
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