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  1. #1
    Senior Member biker7's Avatar
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    Gang,
    Based upon the advice of the bike shop I bought my Bianchi from, the owner suggested I run 120 psi pressure in my Vittoria Rubino Tech tires mated to Campy Vento Wheels and work right off the pump gauge and check every time I ride which seems to be good advice. As fate would have it, when I received the bike the front tire wouldn't hold air so suspected a pinch tear in the tube so picked up a new Presta valve tube. I just order a new Park Tire pump with integrated gauge and the inexpensive Park plastic tire levers to change the tube and all went well with a note that the bead...believe may be Kevlar... on the deep section Vento wheels was a bear...not to get off as much but put back on...made it though...and good news is without any pinch tearing...new tube holds pressure. Couldn't get the tire back on without the Park tire levers incidentally...they work nicely for those interested. Played around with the pump a bit and decided to see how the pressure corelated on my car with Schrader valve...thought I would try it. Noticed that the gauge pressure on the Park pump read lower than my car tire guage when comparing car tire pressure...hmmm. Now I am wondering if there is a corelation issue between the Park pump gauge and what I am actually putting into my bike tires and don't have a Presta tire gauge to compare. Would appreciate some advice from those that may know. 120 psi is a lot to pump into road bike tires and don't want in actual fact to be inflating to more pressure than that due to the pump gauge reading a bit low. Have others checked their tire pump gauge against their tire gauge? Any recommendations for a solid bike pressure guage..perhaps digital? What pressures do you guys run in your 700C X 23mm tires?...my body weight is 188 lbs.
    Thanks,
    George

  2. #2
    Senior Member Retro Grouch's Avatar
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    I use 100psi front, 110psi rear on both my road bike and on my tandem. I used to use 120psi on both, but the lower pressures seem to feel better and roll just as fast.

    Air pressure gauges are an interesting subject in themselves. I suspect that you aren't going to get a very accurate reading at 35psi if you are using a gauge that goes to 200psi. You'd like for the active readings to come in the middle of the gauge for best accuracy. If you want to be really anal about it, you can consider calibrating your gauge with a welding regulator.

    One other thing you might consider is using sentences and paragraphs. It would make your post a whole lot easier to read.

  3. #3
    Senior Member biker7's Avatar
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    Thanks and no Thanks RG,
    Thanks for your comments relative to tire pressure which I tend to agree with and no thanks to your comments about my sentence structure. What is insulting is your very response belies your thesis that you can't follow my stated question(s). Being true to your user name, I suggest if you struggle understanding my sentence structure, do not respond to my posts at all and I will show similar restraint in dissecting your sophmoric prose.
    George

  4. #4
    Senior Member Nessism's Avatar
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    I'm not sure which gauge is more accurate at low pressure but Park makes reasonably good tools so I'd trust it over the auto gauge in the range of pressures for a road bike tire.

    Regarding what pressures to use, most tires have a max inflation pressure printed into the sidewall of the tire. Needless to say, it's best to not exceed these levels. Below this it mostly a matter of ballancing ride quality to risk of pinch flatting. Only you can determine what this ballance should be.

    On my bikes, I inflate to about 115 psi and check them every fourth day or so - pressure after this time is usually in the 95 psi range.. I weigh 170lbs and ride on fairly good roads so pinch flatting in not a major concern of mine.

    Hope this helps.

    Ed

  5. #5
    Senior Member biker7's Avatar
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    It does Ed...Thanks for your comments. It seems that is precisely the balance. Underinflating does induce pinch flatting incrementally and improve ride if not increase rolling resistance....a matter of degree. As you suggest, I will likely run just a bit under max. pressure in favor of a slightly improved ride. And you are quite right about Park equipment...I find there stuff to be top notch as well.
    George

  6. #6
    Senior Member dwatson's Avatar
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    I am 195lbs and run 130 in the front and 180 in the rear. I also use a park pump with gauges. I check my psi before every ride. I don't have the pinch flat problems due to the fact I don't run tubes.
    A lot of the problems with pinch flats is in the tubes, the light weight tube will blow if you look at them wrong. I have found the cheaper tubes are better for most riders.

  7. #7
    Senior Member biker7's Avatar
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    More great advice. Wow dwatson, you run some serious pressure. An astute observation about running a cheaper tube...precisely what I installed and why. Will gladly add a few grams weight for a bit more tube wall thickness to preclude failure.
    BTW Nessism...I checked the sidewall pressure spec on my Vittoria's as you suggested. Min. spec was 100 psi and max is 125 psi. Will likely run them at mid-range based upon the above.
    Thanks,
    George

  8. #8
    cab horn
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    There is this gigantic thread on tire pressures in the Bike Mechanics forum.

    It's final, 100psi isn't enough.

  9. #9
    Senior Member sydney's Avatar
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    Quote Originally Posted by biker7
    Thanks and no Thanks RG,
    Thanks for your comments relative to tire pressure which I tend to agree with and no thanks to your comments about my sentence structure. What is insulting is your very response belies your thesis that you can't follow my stated question(s). Being true to your user name, I suggest if you struggle understanding my sentence structure, do not respond to my posts at all and I will show similar restraint in dissecting your sophmoric prose.
    George
    I think RG nailed it. He also says it with a minimum of prose and big words. All the better for some of us that have killed too many brain cells with an OD of Bud.And FWIW, you could have asked the question in about 2 simple sentences.
    Last edited by sydney; 03-13-05 at 10:48 AM.

  10. #10
    Senior Member sydney's Avatar
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    Quote Originally Posted by biker7
    More great advice.
    Really?? He shouldn't be running that kind of pressure in the rear with any standard clinchers I know of.

  11. #11
    Senior Member skydive69's Avatar
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    I ride almost every day. I run 125/125 in my Specialized Mondo S-works tires. Works great. I have a presta tire gauge which correlates precisely to both of my Specialized pumps and my Blackwell pump. Someone mentioned that Park makes great tools - agreed, but I can assure you that someone else makes their pumps, and certainly their pump gauges. Get a stand-a-alone tire guage for your presta tubes - that way you will have another way of measuring, but you can also calibrate your pump.

    BTW, I check my pressure daily. I want a consistent ride, and I have never seen a tube that will hold the same pressure 24 hours later with a ride in between.
    www.brokennecktobrokenrecords.com

  12. #12
    Senior Member biker7's Avatar
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    Thanks Operator and sydney, there is one on every forum and on this great forum with overall good fellowship, sadly its you. Your reputation and tone of your collection of posting on this board speaks for itself. A summary of who and what you are if you will. And I might add, a sad commentary it is on a message board among people that share the same passion for the same sport. Sydney and this applies to you RG as well, the proper place for any criticism is a PM. Any place else, and it is a reflection on you and not any content within any thread by any particular poster. FYI, within the board software, there is a facility to block any poster you find offensive for whatever reason. Please do not respond to any of my posts in the future and I will oblige and return the favor.
    George

  13. #13
    Senior Member skydive69's Avatar
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    Quote Originally Posted by biker7
    More great advice. Wow dwatson, you run some serious pressure. An astute observation about running a cheaper tube...precisely what I installed and why. Will gladly add a few grams weight for a bit more tube wall thickness to preclude failure.
    BTW Nessism...I checked the sidewall pressure spec on my Vittoria's as you suggested. Min. spec was 100 psi and max is 125 psi. Will likely run them at mid-range based upon the above.
    Thanks,
    George
    BTW, don't sweat the grammar police. There are obligatory police officers on every forum. Even though they can readily understand your post, they cannot help themselves - they must "help" and police you - it's their job. They are on a mission from god!
    www.brokennecktobrokenrecords.com

  14. #14
    Senior Member biker7's Avatar
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    Skydive69...more good input...Thanks. Do you have a suggestion for a good quality tire gauge? I guess, my preference would be a digital gauge unless you have a good suggestion for an analog gauge.
    Thanks,
    George

  15. #15
    Senior Member biker7's Avatar
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    I don't Skidiver. In fact, I find it amusing. Especially if they only knew what my academic background was...lol. Almost any criticism of fellow posters is always a self indictment...pretty transparent.
    George

  16. #16
    Senior Member sydney's Avatar
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    Quote Originally Posted by biker7
    Skydive69...more good input...Thanks. Do you have a suggestion for a good quality tire gauge? I guess, my preference would be a digital gauge unless you have a good suggestion for an analog gauge.
    Thanks,
    George
    I always just used whatever gauge was on the floor pump, go with 110-115(assuming that's within recc.),and have never had an issue.Not alot of rocket science in bikes or inflating bike tires.

  17. #17
    Senior Member sydney's Avatar
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    Quote Originally Posted by biker7
    I don't Skidiver. In fact, I find it amusing. Especially if they only knew what my academic background was...
    Surprising you haven't told us. But but does any academic background assure that one will actually be able to pour whizzzz out of a boot?

  18. #18
    Senior Member biker7's Avatar
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    Actually sydney, there is what is tantamount to rocket science...I have a rocket science background...in bike design and it relates to shifting mechanisms. Sydney...ever do a statistical VSA using GM&T to make sure all the tolerance stack up's coincide based upon all separate permutations of tool cavities and then perform a a DOE and DVP&R to verify? Lots of engineering goes into bicycle design...lol.
    George

  19. #19
    Senior Member sydney's Avatar
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    Quote Originally Posted by biker7
    Actually sydney, there is what is tantamount to rocket science...I have a rocket science background...in bike design and it relates to shifting mechanisms. Sydney...ever do a statistical VSA using GM&T to make sure all the tolerance stack up's coincide based upon all separate permutations of tool cavities and then perform a a DOE and DVP&R to verify? Lots of engineering goes into bicycle design...lol.
    George
    That's just dandy. But I don't need to know about it in order to adjust a derailer or inflate a tire. But now I understand....LOL

  20. #20
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by biker7
    Sydney and this applies to you RG as well, the proper place for any criticism is a PM. Any place else, and it is a reflection on you and not any content within any thread by any particular poster.
    ??????????

  21. #21
    Senior Member biker7's Avatar
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    I know you don't know about it but that's alright man. Understanding how things are designed always helps with mechanical work whether its restoring old BMW's...something I like to do...or adjusting a derailleur....the disciplines are related as the design was created before guys like you tried to work on them.
    George

  22. #22
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by biker7
    I know you don't know about it but that's alright man. Understanding how things are designed always helps with mechanical work whether its restoring old BMW's...something I like to do...or adjusting a derailleur....the disciplines are related as the design was created before guys like you tried to work on them.
    George
    If you're so smart, why did you have to ask how to inflate a bicycle tire?

  23. #23
    Senior Member biker7's Avatar
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    I never said I was smart...lol. I asked about experiences with gauge correlation and threw in some other anecdotal observations.
    DG, why don't you and sydney go out for a bike ride? I prefer to ride with the other guys that feel a bit better about themselves.
    George

  24. #24
    Boo-ya! mrballistic's Avatar
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    as for the other parts of your question, try the 'cover your tire in flour' trick when putting it on your rim. until you stretch out your clinchers, it'll be tough to do it any other way.

    i run my pro races at 110, which seems peachy (that's actually what they're rated for). interestingly, and i doubt that this is in any way relevant, my rubinos would leak air at the rate of abou 10psi/week, while my pro races do that in around a month. i still pump up my tires before any major ride, but i find that i don't have to really do all that much anymore. just an observation.

    anyway, i think anything over 90psi will keep you out of the pinchflat danger zone. after that, it's all about what you can stand.

    super high inflation works well on the tubular clinchers and the such, but i'm not sure that many normal tires are rated above 130 psi.

    as they say, your mileage may vary.

    ok, go back to insulting each other.

  25. #25
    cab horn
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    Just noticed you have a bianchi... WERD.

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