Originally Posted by
DOOM_NX
I own a Specialized Secteur Elite. Currently I ride on 700x25c both front and rear. I weigh around 240 lbs. I inflate my rear tire to 125 psi (max on the sidewall). According to the famous 15% drop chart this isn't enough. Should I change the rear tire to 700x28c? I don't get any pinch flats with the current setup.
They why mess with something that's working? Also, You might try backing off the tire pressure a bit. Maybe 115-120 to start. I'm 200lbs and frequently ride closer to 90psi. I'm not sure what chart you are referencing, but every formula I've tried had me at a higher pressure than I was already using successfully.