Consider rolling resistance, primarily determined by tire system flexibility (casing and tread).
High thread count casings have smaller contact areas and flex easier, but brands achieve flexibility differently (e.g., Continental: thick tread, thin sidewalls vs. Vittoria: thin tread, tougher sidewalls).
Consider the surface factor; rougher surfaces magnify rolling resistance. Smooth drum tests don't reflect real-world conditions, especially rough courses like Ironman New Zealand.
Slightly underinflating tires can be better than slightly overinflating, due to the breakpoint where rolling resistance increases with higher pressure on rough surfaces.
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