I try to keep my stuff right around 150 or so, then I usually add a fan to take it back down to 130-ish just because I'm paranoid.
It's my understanding that anything under 180 is generally acceptable...be careful gearing, though. On my Circuit when I was testing, two teeth made a HUUUUUGE difference. I'm talking like a 55 degree difference. So if you want to gear it up, definitely go only one tooth to start and test from there.
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