[creaturecat]

150-180 seems a bit high for continual cycling. 150 not as bad, obviously.
i would think 160-170 should be your max, no?
you are running in the anaerobic zone, yes? makes it harder to burn fat, no?
in the long run, i would think the high rpm would be detrimental to the heart.
mind you, my knowledge base is limited. : )