Those tires are almost flat if you're running pressures in the 40's. Check the sidewalls- - - -they should specify 80-100 PSI or so. 40 is barely enough to keep the wheel sections locked together securely.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!