Jolt, you might ask your LBS how low you can go with those tires. Fifty psi still sounds underinflated to me if the max is 80. You won't blow them if you inflate them higher than 50 psi; I promise. While I agree that you don't need to inflate a tire to max pressure, especially if you're light, I'm afraid that you still might be at risk for a pinch flat. And whatever you do, always inflate your tires before every ride. You'd be surprised how much air they lose just by sitting there.
As for speed, since it sounds like you're beginner, all you really need to concentrate on right now is riding more. Don't worry that much about how fast you're going. Greater speed will come naturally as you get in better shape, learn to choose the best gear for the conditions, and increase your cadence (rotations of the pedal per minute) up. Have fun with it.



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The only people I can pass are the runners. On a 40 mile ride my average is about 13.3. I can get up in the 20s on flats ,but my average is always 13 something no matter how hard I try. I just smile when I get passed. I keep my tires up to 115-120. I know with my weight I should probably drop the pressure ,but I like the bumps. My tires call for 120 max.
I was 16-17 mph on flats but definitely slower on the hills. According to BikeJournal.com I averaged a little under 12 mph but I don't know if that includes my stopping time. I do know though that I am faster than I was when I first started.
