What's the correct tire pressure on a Metzler front tire? The owners manual says 30, but the Metzler isn't the stock tire of course. I "unwinterized" my bike after work last night, including checking tire pressures. The stock rear Metzler was 27, which was as expected; I pumped it up to 31. But the replacement Metzler on the front was 37.5. What's right up front?

Thanks for your help.

'08 America, AI removed, National Cycle windscreen, bags, tach, dresser bars