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  1. #1
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    A Tire Pressure Thread

    I just put Continental Gatorskin 700x28 tires on. Their web site says the tire pressure range is 95-116psi.

    What relationship is there between tire pressure, weight carrying and comfort?

    Note: Some folks run some really low pressures. But, finally pinned down they confess to weighing very little.

  2. #2
    Senior Member zonatandem's Avatar
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    Comparatively, I weigh very little (135 lbs) and run 120 PSI.

  3. #3
    Senior Member daihard's Avatar
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    Quote Originally Posted by zonatandem View Post
    Comparatively, I weigh very little (135 lbs) and run 120 PSI.
    How is the ride? I weigh about 140 lbs and run about 100 psi on 700x25s. The ride is fairly comfortable.
    Badly-behaved cyclists are usually just cyclists with inadequate infrastructure. Or none at all. - Mikael Colville-Andersen

  4. #4
    Have bike, will travel Barrettscv's Avatar
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    I weight 220 lbs and use 90 psi in the front and 105 psi inflation at the rear with a tire that size. A tire should deflect 10 to 15%. Less than this reduces traction and more than this increases rolling resistance.
    Last edited by Barrettscv; 05-14-14 at 05:55 AM.
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  5. #5
    Senior Member FlatSix911's Avatar
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    Remember to split the Front/Rear wheel load 45%/55% for Road Bikes

    Last edited by FlatSix911; 05-13-14 at 08:19 PM.
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  6. #6
    The Professor akohekohe's Avatar
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    I was going to post a similar chart to FlatSix911. I might add that it is my experience that inflating a tire close to the maximum rated pressure will lead to significantly more flat tires. Of course under-inflating will lead to pinch flats and you risk damaging the rim.
    The more you drive the less intelligent you are. - Tracy Walter as Miller in Repo Man.

  7. #7
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    Quote Originally Posted by zonatandem View Post
    Comparatively, I weigh very little (135 lbs) and run 120 PSI.
    135lb/140lb, 23mm tire at 120psi

    A very hard, responsive ride.

  8. #8
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    205lb rider plus 17lb bike puts me at around 100 kilos all in. 85 psi rear 75 psi front when riding Challenge Parigi-Roubaix. 100/85 when riding Schwab One 700x25 and 95/80 when running Vittoria CX EVO iii 700x25. Latex tubes.

    Life is too short to run cheap rubber. Never had a pinch flat.

  9. #9
    Senior Member rdtompki's Avatar
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    190 lbs, 85/90 front/rear when running my Hutchinson Sector 28mm tubeless. Not pinch flats of course
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    At 143 pounds, I ride 25s at 115. Max pressure rating. I prefer a firm ride.

  11. #11
    A might bewildered... Dudelsack's Avatar
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    I weight 385 pounds and inflate the tires to 250 psi.

  12. #12
    Senior Member rumrunn6's Avatar
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    I'm 224lbs and I pump my tires to 115psi front & rear but some escapes when I take the chuck off, so maybe 110 or 105psi is left in the tires?
    cycling is like baseball ~ it doesn't take much to make it interesting

  13. #13
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    Quote Originally Posted by Dudelsack View Post
    I weight 385 pounds and inflate the tires to 250 psi.
    Hand pump or co2?
    Rydadiamond

  14. #14
    Senior Member donheff's Avatar
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    I too read the article that produced FlatSix's chart several years ago and reduced my pressure. My wife and I both ride at about 60 PSI on 28mm tires and haven't had flats in more than a year. The ride is also a bit more comfortable than would occur at higher pressure.
    Every man is, or hopes to be, an Idler. -- Samuel Johnson

  15. #15
    rugged individualist wphamilton's Avatar
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    I pump mine up to the max, which is only 100 psi on the 25mm I have now, so that I have longer before having to pump them up again.

    If I had to choose a set pressure it would be 80/90 front/back. Total weight is about 175.

    The chart says 70/85 psi but that just seems weird. It might be right though for all I know.

  16. #16
    Senior Member spdracr39's Avatar
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    I am 215lbs and ride on 100lbs 700x23. No problems and comfy ride.

  17. #17
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    High pressure more speed - Lower pressure more comfort

    There certainly is a relationship between tire pressure, speed, and comfort. The relationship between pressure and speed is direct and between pressure and comfort is indirect. I bought a recumbent racing trike that came with Schwalbe Ultremo ZX 406 tires. The rated pressure is 85 to 160 PSI. If you run them at the highest pressure, you might as well be running solid rubber tires. The ride is incredibly harsh. The ride is faster though. I dumped them almost immediately for a set of Tioga PowerBlock tires rated at 35 to 80 psi. Much more comfortable at the rated pressure but slower. I don't like running Schwalbe tires much below the maximum pressure because of bad experience with premature sidewall failure. The sidewalls flex more at the lower end of the rated pressure range. It may mean a shorter life for the tire.

  18. #18
    rugged individualist wphamilton's Avatar
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    Quote Originally Posted by VegasTriker View Post
    There certainly is a relationship between tire pressure, speed, and comfort. The relationship between pressure and speed is direct and between pressure and comfort is indirect. I bought a recumbent racing trike that came with Schwalbe Ultremo ZX 406 tires. The rated pressure is 85 to 160 PSI. If you run them at the highest pressure, you might as well be running solid rubber tires. The ride is incredibly harsh. The ride is faster though. I dumped them almost immediately for a set of Tioga PowerBlock tires rated at 35 to 80 psi. Much more comfortable at the rated pressure but slower. I don't like running Schwalbe tires much below the maximum pressure because of bad experience with premature sidewall failure. The sidewalls flex more at the lower end of the rated pressure range. It may mean a shorter life for the tire.
    I don't think so. I think a speed/pressure curve has a maximum well before the highest pressure, other things held equal, and that the other variables complicate that even further.

  19. #19
    Senior Member Northwestrider's Avatar
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    It makes a difference, try it and decide for you.

  20. #20
    just keep riding BluesDawg's Avatar
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    I like to go as low as I can without risking pinch flats. I run about 70f and 80r in the Pasela TG 28s on my Casseroll and about 85f and 95r on the Turbo Pro 23s on my Roubaix. Sometimes lower. EDIT - I weigh about 170 lbs.

    Another factor to consider is whether you ride light or heavy. Riders who stand up over RR crossings and rough spots, who know how to make a bike float over bumps, can go with lower pressure than those who keep their butts planted on the saddle in all situations.
    Last edited by BluesDawg; 05-13-14 at 10:46 AM.
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  21. #21
    aka Phil Jungels Wanderer's Avatar
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    I run my Marathon Supremes at 92 PSI, (35s and 40s) because, for me, that's where they roll the best. Not 85, and not 95, but 92. Everyone is different in their wants and needs.

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  22. #22
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by Wanderer View Post
    I run my Marathon Supremes at 92 PSI, (35s and 40s) because, for me, that's where they roll the best. Not 85, and not 95, but 92. Everyone is different in their wants and needs.
    I'm just the opposite.

    Over the years I've slowly gravitated to using wider tires and less air pressure. The big "Aha" for me was when I went from using 120 psi to 100/110 psi with 28 mm tires on our tandem. We never pinch flatted, seemed to go about the same speed, but felt a lot smoother. I used to top up my tire pressure before every ride. Today I can't remember for sure the last time I pumped up my tires. I just squeeze them with my fingers and, if they don't feel "too" soft, I just ride. Subjectively I don't feel slower or that I'm having to work harder but, honestly, I don't fret about those things anymore.
    My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.

  23. #23
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    I weigh 193 lbs. and am 71. I recently changed tire size of my GP4000s from 700x23 to 700x25. I used to run 110 rear and 100 fronts. I now run 105 rear and 95 fronts. I have never had a pinch flat on either size and have used these tires for better than 30,000 miles. They are ridden pretty hard with yesterdays ride hitting 45 mph. Some of the roads are fairly rough, especially on some mountain descents.

  24. #24
    Senior Member bruce19's Avatar
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    Don't know how this might fit in but I weigh 182 lbs and my bike weighs 18 lbs. I run 700X25 at 100 psi front and 110 psi rear. Rolls well and is comfortable.

  25. #25
    rebmeM roineS JanMM's Avatar
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    I have bought into the 15% tire drop line of thinking (http://www.bikequarterly.com/images/TireDrop.pdf) and currently run my long wheelbase 'bent (30/70 Front/Rear weight) at 50/80 psi with 32 mm tires. Looking at the chart again, I could probably go lower at both ends. (225 lbs me+bike)
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