Road Cycling · Public discussion

Tire Pressure and Stability

Started by Elisa Francesca · · Last activity · 12 posts · 441 views

Thread navigation

Jump through the discussion

Go to the original post, the replies on this page, or the latest preserved contribution.

Thread details

What we know about this thread

Original section
Road Cycling
Published
20 June 2003
Last activity
25 June 2003
Original author
Elisa Francesca
Posts
12
Discussion status
Public discussion
Total views
441
Views / 30 days
0

The navigation and discussion metadata provide context. Posts remain in their original chronological order.

Showing posts 1–12 of 12
Posts remain in their original chronological order.

Text size
  1. Increasingly concerned about the slow response time of my bicycle brakes and after nearly ramming
    into a parked car, I took Myrtille to the Local Bicycle Shop for a general check-up. My problem is
    my inexperience. She is my first ever bike, I only started riding a few months ago, and I never know
    whether my discomfort is due to a bike fault or my bad riding.

    The young man at the shop did indeed report a problem with the brakes. They were not worn out but
    completely misregulated - he said I was heading straight into a wall. He checked the derailleur too,
    finding it slightly misaligned. I have been able to change gear without too much hassle but about
    one time in twenty the chain pops off. Most interestingly, he said the tires were very flat, and
    pumped them up to the usually required pressure.

    To my delight, I found Myrtille far more stable on the road today than I have ever known her. I have
    been reporting my sense of instability at higher speeds in another thread, which has given rise to a
    very impressive debate about the physics of gyroscopes, as one knight after another enters the joust
    to prove that my perception is against the laws of the Created Universe. Well, it turns out there
    was a whole other parameter in the picture - flaccid tires wobbling all over the place, the faster
    the wobblier.

    Obvious to you, but not to me. There's a first time to everything. Many years ago, knowing nothing
    about photography, I bought an Olympus SLR which should have been the camera of my lifetime. I
    couldn't get a single decent picture out of it, but of course that was just because I was stupid. I
    only cottoned on to the fact that the instrument itself was a total lemon, with a shutter that
    answered to no-one, when it was past guarantee and cost a fortune to repair. Newbies don't know
    enough to know when they re in the right.

    There's something else I have learned: An instrument is not necessarily in good use-condition
    just because it is brand new and shiny. Bikes in cycling shops are like animals in pet shops -
    unloved, treated only as well as is minimally consistent with their economic status as a
    commodity, they wait forlornly for a human to adopt them and complete their destiny. I suppose an
    experienced cyclist with a new bike spends the whole first day checking it over and regulating
    everything, just as a computer nerdess like myself will spend a good week on the installation and
    tweaking of a new machine. But newbies should be aware, especially if they buy their cycles in
    places of mass consumption like mall shops (as opposed to small cycling businesses run by
    passionately committed experts) that they will need to line up a knowledgeable person to help
    them get their bike on the road.

    My two centimes. Cheers,

    Elisa Roselli Paris, France

  2. Elisa Francesca Roselli said:

    To my delight, I found Myrtille far more stable on the road today than I have ever known her. I
    have been reporting my sense of instability at higher speeds in another thread, which has given
    rise to a very impressive debate about the physics of gyroscopes, as one knight after another
    enters the joust to prove that my perception is against the laws of the Created Universe. Well, it
    turns out there was a whole other parameter in the picture - flaccid tires wobbling all over the
    place, the faster the wobblier.

    They do that. And even at low speeds, cornering will be hell.

    Unlike cars, bike tires *really* need to be regularly (ie, you can usually get away with at very
    most a couple of weeks between, depending on use, usually less) pumped up. If you don't have a pump,
    you should consider buying one. For the wide type of tire, 35-40 mm wide, that you probably have,
    the 'rule of thumb' is that you should pump it until you can just barely indent it by pressing your
    thumb against it. If you get a pump with a pressure indicator, you can inflate them more accurately
    to a set standard, but it's not absolutely necessary.

    Jasper

  3. In article <[email hidden]>,
    [email hidden] says...

    ...

    Quoted message said:

    To my delight, I found Myrtille far more stable on the road today than I have ever known her. I
    have been reporting my sense of instability at higher speeds in another thread, which has given
    rise to a very impressive debate about the physics of gyroscopes, as one knight after another
    enters the joust to prove that my perception is against the laws of the Created Universe. Well, it
    turns out there was a whole other parameter in the picture - flaccid tires wobbling all over the
    place, the faster the wobblier.

    Maybe now you'll feel comfortable screaming down those hills you were worried about in a
    previous message!

    Quoted message said:

    Obvious to you, but not to me. There's a first time to everything. Many years ago, knowing nothing
    about photography, I bought an Olympus SLR which should have been the camera of my lifetime. I
    couldn't get a single decent picture out of it, but of course that was just because I was stupid.
    I only cottoned on to the fact that the instrument itself was a total lemon, with a shutter that
    answered to no-one, when it was past guarantee and cost a fortune to repair. Newbies don't know
    enough to know when they re in the right.

    Good point.

    Quoted message said:

    There's something else I have learned: An instrument is not necessarily in good use-condition just
    because it is brand new and shiny. Bikes in cycling shops are like animals in pet shops - unloved,
    treated only as well as is minimally consistent with their economic status as a commodity, they
    wait forlornly for a human to adopt them and complete their destiny.

    I like this analogy!

    Quoted message said:

    I suppose an experienced cyclist with a new bike spends the whole first day checking it over and
    regulating everything, just as

    That's me!

    Quoted message said:

    a computer nerdess like myself will spend a good week on the installation and tweaking of a new
    machine.

    That's me, too!

    Quoted message said:

    But newbies should be aware, especially if they buy their cycles in places of mass consumption
    like mall shops (as opposed to small cycling businesses run by passionately committed experts)
    that they will need to line up a knowledgeable person to help them get their bike on the road.

    My two centimes. Cheers,

    This post is definitely worth more than two centimes! At least a few Euro's, I'd say.

    --
    David Kerber An optimist says "Good morning, Lord." While a pessimist says "Good Lord,
    it's morning".

    Remove the ns_ from the address before e-mailing.

  4. Quoted message said:

    Bikes in cycling shops are like animals in pet shops - unloved, treated only as well as is
    minimally consistent with their economic status as a commodity, they wait forlornly for a human to
    adopt them and complete their destiny. I suppose an experienced cyclist with a new bike spends the
    whole first day checking it over and regulating everything, just as a computer nerdess like myself
    will spend a good week on the installation and tweaking of a new machine.

    Eeeek, if that's true, I'm likely to be arrested by the cycling equivalent of the ASPCA (American
    Society for the Prevention of Cruelty to Animals). I tend to ride my bikes hard, and put them away
    dirty. I lube the chain whenever it's annoyingly noisy, and clean the bike - well, sometimes before
    a race. To me, the dust that accumulates on my bikes is like a fine patina of use - akin to the mud
    you might find hanging from every available perch on a four wheel drive vehicle that's used
    properly. I raise my nose to those spotlessly shiny bikes I see on the road and label their riders
    "poseurs" (did I spell that right?). ;-)

    Mark Hickey Habanero Cycles habcycles.comhabcycles.com Home of the $695 ti frame

  5. Mark Hickey said:


    Eeeek, if that's true, I'm likely to be arrested by the cycling equivalent of the ASPCA (American
    Society for the Prevention of Cruelty to Animals). I tend to ride my bikes hard, and put them away
    dirty. I lube the chain whenever it's annoyingly noisy, and clean the bike - well, sometimes
    before a race. To me, the dust that accumulates on my bikes is like a fine patina of use - akin to
    the mud you might find hanging from every available perch on a four wheel drive vehicle that's
    used properly. I raise my nose to those spotlessly shiny bikes I see on the road and label their
    riders "poseurs" (did I spell that right?). ;-)

    Ha! I'm tempted to forward your post to my tri-athlete director. She gave me a (moderately) hard
    time about my bike being dirty. Cripes, it's Seattle and I ride every day to work rain or shine. Of
    course my bike is covered with road spray, I'm always using it.

    --
    Dane Jackson - z u v e m b i @ u n i x b i g o t s . o r g clone, n:
    1. An exact duplicate, as in "our product is a clone of their product." 2. A shoddy,
    spurious copy, as in "their product is a clone of our product."

  6. Dane Jackson said:
    Mark Hickey said:


    Eeeek, if that's true, I'm likely to be arrested by the cycling equivalent of the ASPCA (American
    Society for the Prevention of Cruelty to Animals). I tend to ride my bikes hard, and put them
    away dirty. I lube the chain whenever it's annoyingly noisy, and clean the bike - well, sometimes
    before a race. To me, the dust that accumulates on my bikes is like a fine patina of use - akin
    to the mud you might find hanging from every available perch on a four wheel drive vehicle that's
    used properly. I raise my nose to those spotlessly shiny bikes I see on the road and label their
    riders "poseurs" (did I spell that right?). ;-)

    Ha! I'm tempted to forward your post to my tri-athlete director. She gave me a (moderately) hard
    time about my bike being dirty. Cripes, it's Seattle and I ride every day to work rain or shine. Of
    course my bike is covered with road spray, I'm always using it.

    A dirty bike is a used bike. A sparkling clean bike is a garage ornament. ;-)

    Mark Hickey Habanero Cycles habcycles.comhabcycles.com Home of the $695 ti frame

  7. "Mark Hickey" <[email hidden]> wrote in message
    "]news:[email hidden]...

    Quoted message said:
    Dane Jackson said:

    Ha! I'm tempted to forward your post to my tri-athlete director. She gave me a (moderately) hard
    time about my bike being dirty. Cripes, it's Seattle and I ride every day to work rain or shine.
    Of course my bike is covered with road spray, I'm always using it.

    A dirty bike is a used bike. A sparkling clean bike is a garage ornament. ;-)

    But a filthy bike needs either a bath or fenders.

    -Buck

  8. Elisa Francesca Roselli said:

    Most interestingly, he said the tires were very flat, and pumped them up to the usually required
    pressure.

    To my delight, I found Myrtille far more stable on the road today than I have ever known her. I
    have been reporting my sense of instability at higher speeds in another thread, [...] Well, it
    turns out there was a whole other parameter in the picture - flaccid tires wobbling all over the
    place, the faster the wobblier.

    I am embarased to admit that it didn't occur to me that your feeling of instability was more than
    just a feeling--that it actually was physical instability that could be caused by tire inflation. I
    should have thought of this. Come to think of it, untrue wheels or a messed up headset can also
    cause instability though those are less common in new bikes. Tires need to be re-inflated regularly.
    Rubber is gas permeable; especially the relatively thin rubber of bike tubes. Another problem with
    under-inflated tires is that you can hit a bump in the road and the tire will be pressed violently
    against the wheel rim which can cut the tube; putting two good sized holes in the tube (often called
    a "snake bite" flat).

    Anytime your bike gets wobbly and you don't know why, take it to the bike shop and have them check
    it out. It should be stable; even at relatively high speeds.

    I'm glad to hear that the bike shop caught it and fixed it and educated you about proper tire
    inflation. It sounds like you'll be going down those hills a little faster soon.

    --Bill Davidson

  9. Buck j u n k m a i l @ g a l a x y c o r p . c o m said:

    "Mark Hickey" <[email hidden]> wrote in message

    Quoted message said:


    A dirty bike is a used bike. A sparkling clean bike is a garage ornament. ;-)

    But a filthy bike needs either a bath or fenders.

    I have a front fender (though I had to improvise a mount)[1]. But there is no way to put a regular
    fender in the rear. I would either have to settle for a partial fender, or finally get around to
    making one.

    The next bike is definitely going to be more of a touring frame.

    [1] I was *really* annoyed to see that this years edition of my bike has front fender eyelets. That
    would have saved me a trip or two to the hardware store.

    --
    Dane Jackson - z u v e m b i @ u n i x b i g o t s . o r g clone, n:
    2. An exact duplicate, as in "our product is a clone of their product." 2. A shoddy,
    spurious copy, as in "their product is a clone of our product."

  10. Quoted message said:

    Bikes in cycling shops are like animals in pet shops - unloved, treated only as well as is
    minimally consistent with their economic status as a commodity, they wait forlornly for a human to
    adopt them and complete their destiny.

    Nice sentiment. The fact is that they are only machines. To attribute emotion to a machine is only
    to project your own feelings, they are only constructs. You said it yourself, and I paraphrase,
    either the machine is well regulated or it isn't.

    We cyclists are intimate with our machines, and we understand issues of comfort level. But it isn't
    the machine doing it deliberately.

    It's either a less well-regulated machine or a user issue, the only thing worth considering is the
    interface, why do I call my PX-10 Colette and tolerate a broken front derailleur high limit screw,
    well, I'm not logical but I am consistent.

    And you can't get new parts for her, ah, it.

    I want to say it's a personality but in fact it's just a constellation of workarounds that I
    wouldn't tolerate in any of my other bikes.

    They each have other quirks, but they are just machines.

    --

    _______________________ALL AMIGA IN MY MIND_______________________ ------------------"Buddy Holly,
    the Texas Elvis"------------------
    __________306.350.357.38>>[email hidden]__________

  11. Quoted message said:

    Mark Hickey [email hidden]

    wrote in part:

    Quoted message said:

    I raise my nose to those spotlessly shiny bikes I see on the road and label their riders "poseurs"
    (did I spell that right?). ;-)

    I clean my road bike regularly, some might say obsessively. What's so obsessive about using
    different sized toothbrushes for the derailleurs versus the calipers? ;-) BTW, does your observation
    apply if the bike in question happens to be a Habanero?

    Regards, Bob Hunt

  12. (Hunrobe) said:
    Quoted message said:

    Mark Hickey [email hidden]

    wrote in part:

    Quoted message said:

    I raise my nose to those spotlessly shiny bikes I see on the road and label their riders "poseurs"
    (did I spell that right?). ;-)

    I clean my road bike regularly, some might say obsessively. What's so obsessive about using
    different sized toothbrushes for the derailleurs versus the calipers? ;-) BTW, does your
    observation apply if the bike in question happens to be a Habanero?

    No, THAT'S different.

    Just make sure and keep the decals clean.

    Mark Hickey Habanero Cycles habcycles.comhabcycles.com Home of the $695 ti frame

Active in the last 60 minutes

Active in this thread

0 users · 0 guests ·0 bots ·0 total

No signed-in users are active right now.

No known search crawlers active right now.