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Thread: Optimal PSI

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    Optimal PSI

    I am hearing/reading very different opinions on optimal PSI - reading online, forums and LBS. I am 5'8 135lbs, normally not so skinny but lost about 20 lbs last year from being ill (acid reflux) and cycling is keeping me from gaining it back. Anyway, my LBS says run 100 in the front and 110 PSI rear. These were on 28mm Armadillos I purchased at the store. I found the ride very "harsh" on the Armadillos and lowest I went was 90 PSI. Now I am running 23mm Vittoria Zaffiro slicks. Changing to the Zaffiro was a huge difference, way more comfortable and traction.. I am mostly on pavement. So now I pump up to 100 PSI and ride for two days, the second day is prob at 85-90 PSI by my guesstimate.

    So what would be the optimal PSI for my weight? Just wondering how reliable are those charts recommending PSI for rider weight. My LBS says 100 but I see some of those charts going down to 55ish front for my weight. TIA

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    I should say optimal for comfort. I just used the calculator on Vittoria's site and it says 90 front, 95 back. So it ranges from 60-100, who is correct?

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    It really comes down to your preferences. I try to stick around 100-110psi since I feel my bike rides the best on those range.

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    forget the charts. forget what the LBS says. disregard the writing on the sidewalls, pay no attention to that man behind the curtain....





    put 100PSI in front and back, increase it 10PSI per ride until your teeth rattle, then decrease until you get a pinch flat or two. then find a middle ground you like.

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    How wide are your wheels? Many wheel manufacturers are going to wider rims these days. One of the virtues of this trend is you can supposedly run lower pressures without risking pinch flats. Many people are running 80-85 psi. Myself, I like 90-95.

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    Senior Member ttusomeone's Avatar
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    I agree with others - play around with the pressures and see what feels best. I'm your same weight and I use 23c Specialized Turbo Pro tires. For road rides I do 100 psi front and rear and if I'm racing a crit Ill go 96 or 97 psi front and rear.
    Cat 1 o-meter: 0/35 points

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    My Bad! Makel's Avatar
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    Quote Originally Posted by coasting
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    Senior Member grolby's Avatar
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    Ten lbs lighter than you, OP, and with 23s these days I'm running 80f/85r. I seldom pinch flat, but that might be a riding style thing.

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    Play with the pressures until you find what's right for you.

    @ 5' 8", 135lbs., 64 years old, the 120psi fr/rr was just right for my 135 mile training ride on Sunday.

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    Quote Originally Posted by Makel View Post
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    You're just trying to start an argument to show how smart you are.

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    Senior Member datlas's Avatar
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    LBS is FOS.

    The charts and formulae are a guide but not gospel. The "max" on the tire is the absolute max, not ideal.

    I suspect you would do best with around 80-85PSI.

    I do like this chart, in general.

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    blah blah blah milkbaby's Avatar
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    +1 on experimenting with pressures and finding what works best for you. I'm 135-140 pounds and go about 75-80/85-90 psi front/rear on 700x23 Continental GP4000 or Gatorskin clinchers mounted to conventional width rims (about 20-21 mm wide at the brake track). I probably could go a little lower pressure on the front without it getting squirmy. I'll bleed 5-10 psi off when it is wet out.

    I also ran the same pressures on Zaffiro Pro Slick tires that came stock on one of my bikes until I needed to replace them.

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