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I'm in between the Lake CX219 and the CX177, the main difference being that the outsole is 100% carbon vs injected fiberglass nylon, price difference being 70 bucks. I'm a cheap asshole, but I can afford either.
Is it worth it to spend the extra 70 for a carbon sole? I ride like 5k miles per year, and my rides are usually 3-4 hours. How much life can I expect from a cycling shoe before it begins to collapse or something?