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  1. #1
    Senior Member cyclezealot's Avatar
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    Pressured air units in Europe.US Equivilant please?

    We are new to Europe. I see no references to compare lbs per square inch, to whatever units are used here in Europe. ANyone help me out on this basic question.
    First, what are the units. And what are equivilant units in US lbs. per square inch. My race bikes takes 110 US pounds and my touring bikes require 85 lbs. My pump I bought over reads out in pounds per square inch. thanks lots. How can I look up these units, I don't even know what they are.
    I have no reference books, at present - most of our books are somewhere in the Middle of the Atlantic.

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    Senior Member juicemouse's Avatar
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    I believe Bars are the most popular non-scientific unit of pressure in most of the rest of the world. 1 bar = 14.5 psi. The more scientific SI unit of pressure is the Pascal. 1 Pa = 0.000145 psi
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  3. #3
    me have long head tube TallRider's Avatar
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    I don't know what units are used in Europe. And if you know enough to know that they're not using PSI on that side of the pond, you should know enough to tell us what units they do use. I just noticed from the sidebar that you're in France, but that would have been worth noting in your post as well.
    I'm sure some knowledgable people will answer in a bit, but for now I'll read the equivalent "bar" off of my pump gauge...
    2 bar - 29 psi
    4 bar - 58 psi

    Anyway, all around the dial, each bar is worth 14.5 psi.
    Hope this helps. But again, there are other people on this forum who have been to Europe.

  4. #4
    Formerly Known as Newbie Juha's Avatar
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    Isn't the psi measure same in Europe and US? At least your numbers are in the same ballpark as mine... also the conversion site http://www.convert-me.com/en/convert/pressure does not list a separate "metric" psi reading.

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    As the previous poster pointed out, most European gauges are in Bar, with 1 Bar = 14.5 psi. If you look on your tires you might see both units listed (e.g. my tires say "7-9 bar"). To get 110 psi, inflate to 7.6 Bar.

  6. #6
    Senior Member AnthonyG's Avatar
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    Quote Originally Posted by juicemouse
    I believe Bars are the most popular non-scientific unit of pressure in most of the rest of the world. 1 bar = 14.5 psi. The more scientific SI unit of pressure is the Pascal. 1 Pa = 0.000145 psi
    My Mac computer has a converter as one of its widgets and it says the same thing. 1 bar = 14.5 psi.

    7 bar is 101 psi and 8 bar is 116 psi.

    Regards, Anthony

  7. #7
    me have long head tube TallRider's Avatar
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    If you're mathematically-minded, you could even use a calculator to convert by a factor of 14.5 (that four people in a row have so kindly provided, albeit at least the first two posted without having seen the other's post), instead of relying on a cute Mac converter

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    You need a new bike supcom's Avatar
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    If you look closely at the sidewalls of your tires, your will almost certainly see pressure maximums in bars as well as psi.

  9. #9
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    Quote Originally Posted by supcom
    If you look closely at the sidewalls of your tires, your will almost certainly see pressure maximums in bars as well as psi.

    Very true. Also Google "metric conversion calculator" for an on line converter, and just put in Bars and get PSI. One bar is atmosphere pressure at sea level, about 14.5 psi.
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  10. #10
    You Know!? For Kids! jsharr's Avatar
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    If you brought your own pump, labeled in PSI, what is the problem? It will work the same in EU as in USA.
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  11. #11
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    1 bar is 1 kg/sq cm. Standard atmospheric pressure is 14.7 psi. Close enough but not the same.

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    Quote Originally Posted by 2manybikes
    Very true. Also Google "metric conversion calculator" for an on line converter, and just put in Bars and get PSI. One bar is atmosphere pressure at sea level, about 14.5 psi.

    Or skip a step and just google "120psi in bar" and let Google's built-in calculator do the work. It'll also convert pretty much any unit to pretty much any other unit... super useful. It's actually the reason I installed the google deskbar.
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  13. #13
    Senior Member cyclezealot's Avatar
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    Harr, My dilema was. Two days ago bought a new utility bike. Never occured to me as I left the shop to discuss this matter with the shop owner in Argeles. Well, those tires had markings in bars, I see know. My pump lists psi. on it's gauge. As pumping up the tires , did not know what to do. I had no idea what a bar is. know we all know. All caused by the US use of pounds over Kg. Makes sense now.
    14.5 -thanks all.
    The One time I filled my car tires. Think the gauge at the pump said 2.7. I used my tire gauge which said 35.

  14. #14
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by cyclezealot
    We are new to Europe. I see no references to compare lbs per square inch, to whatever units are used here in Europe. ANyone help me out on this basic question.
    First, what are the units. And what are equivilant units in US lbs. per square inch. My race bikes takes 110 US pounds and my touring bikes require 85 lbs. My pump I bought over reads out in pounds per square inch. thanks lots. How can I look up these units, I don't even know what they are.
    I have no reference books, at present - most of our books are somewhere in the Middle of the Atlantic.
    Bookmark http://www.onlineconversion.com/. It's the handiest and best converter around. All us science guys use it as much as the rest of the world uses Google
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  15. #15
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    as much as I love onlineconversion.com, google is increasingly useful for standard conversions. For example, if you type in "145 psi to bar", the first line is "145 pounds per square inch = 9.99739808 bar". It does currency and most units for measuring just about anything.

  16. #16
    Senior Member cyclezealot's Avatar
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    Quote Originally Posted by cyccommute
    Bookmark http://www.onlineconversion.com/. It's the handiest and best converter around. All us science guys use it as much as the rest of the world uses Google
    Hey. thanks .Checked it out. Made it a favorite. Should never have to ask a similiar question ever again.

  17. #17
    Banned. Bekologist's Avatar
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    here's another pressure measurement - kiloPascals....i have a accu-gage with PSI and kPa's on it...

    ... anyway, on the dial, 120 PSI is very close to 822 kPa, 155PSI is 1000 kPa's,

    90 PSI is 620 kPa's.

  18. #18
    Senior Member spinbackle's Avatar
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    Whatever happened to the good 'ol thumb and forefinger way of determining tire pressure? In a pinch, it is adequate (provided you still have both of these).
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    Conversions

    go to google, type in "air pressure conversion", or somethin like that and you'll get links to pressure conversions, in europe i'd guess your tires/pump would probably be in pascales (kpa = kilo-pascal) but i'd have to see what your tire says to give you the correct version. for these sites, you type in the unit from and the unit to and from 100 psi to...._____kpa and the converter fills in the blank for you. You don't even need a calculator. good luck. by the way tpi is not a tire pressure it is "threads per square inch", which has to do with tire construction, and is like the threads count on your bedroom sheets.
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