Originally Posted by
alanbikehouston
But, at 140 PSI, NO tire feels "supple", unless you weigh over 250 pounds, because the sidewalls have ZERO deflection... they are functioning as blocks of wood under the weight of a 160 pound rider.
Hell I have a pair of michelin PR3's right now on a spare wheelset being "stretched out" @ 130psi and I can easily deflect the sidewall by pinching on it with my fingers. I've had 145 psi on my reynolds wheels and vittorias and I've been able to see the sidewalls bulge at the contact points as I ride. I don't need a caliper to tell me that they deflect... but I have a pair of calipers that measure down to 0.0005", a very accurate pressure gage, and I'm north of 150. Are you willing to put money on that?