Ahhhhh yes, running your tires with only 1/3 to 1/2 of the recommended pressure will cause a little squirreliness! I check my tires at least every other week in the riding season and always have to top them off, usually 2 to 3 lbs. Here in the north, I check them before every ride when the temperature drops below 50. Cold, windy and rainy here today, but it's better than the snow we got yesterday! Ride safely! Jevers