On a hard lateral load with braking the 'Y' would want to spread, do that a few times and a crack starts on the inside? I am not an engineer, but I think like one, and I tend to err on the overkill side. On a rear wheel I wouldn't be as concerned, but on a front you are along for the ride if something failed. I think if you check it often it will give you plenty of warning before it let go, unlike aluminum.
Jason
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