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because mine is not a cold maximum, i belive. If i set mine to 51, they'd be mid-high 50's on the highway and my sidewalls would have very little tolerance to shocking forces such as skidding sideways through a ditch. You are DEFINATELY NOT at the same level of safety as if you inflated to 40psi, though.
Do some searching for racing research for a chart of psi vs. grip. You'll see a major decline in grip after the "peak" level. If you live in a little boon-town and you never see any risky driving, sure, use the maximum rating. If you ever use highways near a city, I wouldn't risk it.
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