Testing the grip limits of ice tyres.....

Discussion in 'Mountain Bikes' started by Shaun Rimmer, Feb 6, 2003.

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  1. Shaun Rimmer

    Shaun Rimmer Guest

    Well, the night before last, I popped up to the shop on the home made ice tyre equipped SS, and on
    the way back, decided to test the limits of their grip. I came to one corner (slowly - about 7 or 8
    mph) that was covered in sheet white ice with a good hard glaze to it, and gently banked the bike, I
    gave the rear brake lever a squeeze, and pretty soon the back wheel locked and kicked out to the
    side. I recovered it no problem.

    The next corner, same conditions, I flicked the bike round it harder, again banking slightly,
    touched the brakes, and <scccrschrschsch!> first back, then front wheel lost it, and I let go of the
    bike and took a short sit down on the ice to rest and ponder how far I could push the tyres.

    I guess full on banking corners on hard ice at speed are out then.

    What is the general limit of say, the Nokian 296/extremes then? John G? Anyone?

    Cheers!

    Shaun aRe
     
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  2. Reminds me of my first ride on my homemade ice tires. We couldnt find any ice, just a few inches of
    snow, so we headed down to the old sinkholes, and sure enough, some one had cleared the snow off to
    make a hockey rink. I ventured out on the ice,my ride mates staying on the shore. I began to circle
    the cleared area at ever incresing speeds, till finally traction let go. I went off the rear of the
    bike and landed on my butt, because of the speed of the fall my head whipped into the ice, and I
    lost concsiousness for about 30 seconds. I awoke to see my ride mates approaching, they thought i
    was dead. Needless to say, the ride was over for me. When we got back to the pickup, I noticed that
    my Giro was split, all the way up the back. I have never fallen that hard or hit my head so hard as
    on that day. My first thought, upon comming to was that I had forgotten my helmut. I still ride in
    icy weather , but stay off the frozen ponds. Jim
     
  3. "Shaun Rimmer" <[email protected]> wrote in message
    news:[email protected]...
    >
    > Well, the night before last, I popped up to the shop on the home made ice tyre equipped SS, and
    > on the way back, decided to test the limits of their grip. I came to one corner (slowly - about
    > 7 or 8 mph) that was covered in sheet white ice with a good hard glaze to it, and gently banked
    > the bike,
    I
    > gave the rear brake lever a squeeze, and pretty soon the back wheel locked and kicked out to the
    > side. I recovered it no problem.
    >
    > The next corner, same conditions, I flicked the bike round it harder,
    again
    > banking slightly, touched the brakes, and <scccrschrschsch!> first back, then front wheel lost it,
    > and I let go of the bike and took a short sit
    down
    > on the ice to rest and ponder how far I could push the tyres.
    >
    > I guess full on banking corners on hard ice at speed are out then.
    >
    > What is the general limit of say, the Nokian 296/extremes then? John G? Anyone?
    >
    > Cheers!
    >
    > Shaun aRe

    I have Nokian 296's F & R. Haven't really tried to find the limits but I routinely ride on water
    (across ponds) and I can easily lock my front (Hayes disk) wheel into a low speed wheel stand.
    They're amazin!
    --
    DTW .../\.../\.../\...
     
  4. D T W .../\\... wrote:
    > "Shaun Rimmer" <[email protected]> wrote in message
    >>What is the general limit of say, the Nokian 296/extremes then? John G? Anyone?
    > I have Nokian 296's F & R. Haven't really tried to find the limits but I routinely ride on water
    > (across ponds) and I can easily lock my front (Hayes disk) wheel into a low speed wheel stand.
    > They're amazin!

    The ONLY time I have ever fallen while riding my bike while equipted with Extremes is when I had to
    do an emergency stop on the frozen waters of Stumpfield Swamp to keep from running over my
    brain-dead prey-driven dog. resulted in a broken elbow
    http://www.shavings.net/images/bikes/ice/icebikeelbow2.jpg

    Other than that I have not found a limit to them, though I have tried as hard as I can.
     
  5. Bill Wheeler

    Bill Wheeler Guest

    On Thu, 6 Feb 2003 11:28:01 -0000, "Shaun Rimmer" <[email protected]> wrote:

    >
    >Well, the night before last, I popped up to the shop on the home made ice tyre equipped SS, and on
    >the way back, decided to test the limits of their grip. I came to one corner (slowly - about 7 or 8
    >mph) that was covered in sheet white ice with a good hard glaze to it, and gently banked the bike,
    >I gave the rear brake lever a squeeze, and pretty soon the back wheel locked and kicked out to the
    >side. I recovered it no problem.
    >
    >The next corner, same conditions, I flicked the bike round it harder, again banking slightly,
    >touched the brakes, and <scccrschrschsch!> first back, then front wheel lost it, and I let go of
    >the bike and took a short sit down on the ice to rest and ponder how far I could push the tyres.
    >
    No wonder your back hurts.

    Peace, Bill

    The mind serves properly as a window glass rather than as a reflector, that is, the mind should give
    an immediate view instead of an interpretation of the world.
    :-]
     
  6. Bomba

    Bomba Guest

  7. Shaun Rimmer

    Shaun Rimmer Guest

    Bill Wheeler <[email protected]> wrote in message
    news:[email protected]...
    > On Thu, 6 Feb 2003 11:28:01 -0000, "Shaun Rimmer" <[email protected]> wrote:
    >
    > >
    > >Well, the night before last, I popped up to the shop on the home made ice tyre equipped SS, and
    > >on the way back, decided to test the limits of
    their
    > >grip. I came to one corner (slowly - about 7 or 8 mph) that was covered
    in
    > >sheet white ice with a good hard glaze to it, and gently banked the bike,
    I
    > >gave the rear brake lever a squeeze, and pretty soon the back wheel
    locked
    > >and kicked out to the side. I recovered it no problem.
    > >
    > >The next corner, same conditions, I flicked the bike round it harder,
    again
    > >banking slightly, touched the brakes, and <scccrschrschsch!> first back, then front wheel lost
    > >it, and I let go of the bike and took a short sit
    down
    > >on the ice to rest and ponder how far I could push the tyres.
    > >
    > No wonder your back hurts.

    Oh, right, so the effects of a minor and expected fall have shock-waved into history then?

    D'oh!

    Shaun aRe
     
  8. Shaun Rimmer

    Shaun Rimmer Guest

    ClydesdaleMTB <[email protected]> wrote in message news:[email protected]...
    >
    >
    > D T W .../\\... wrote:
    > > "Shaun Rimmer" <[email protected]> wrote in message
    > >>What is the general limit of say, the Nokian 296/extremes then? John G? Anyone?
    > > I have Nokian 296's F & R. Haven't really tried to find the limits
    but I
    > > routinely ride on water (across ponds) and I can easily lock my front
    (Hayes
    > > disk) wheel into a low speed wheel stand. They're amazin!
    >
    > The ONLY time I have ever fallen while riding my bike while equipted with Extremes is when I had
    > to do an emergency stop on the frozen waters of Stumpfield Swamp to keep from running over my
    > brain-dead prey-driven dog. resulted in a broken elbow
    > http://www.shavings.net/images/bikes/ice/icebikeelbow2.jpg
    >
    > Other than that I have not found a limit to them, though I have tried as hard as I can.

    Cheers John.

    How far do the studs protrude above the level of the rubber? Are they domed, or pointed?

    On my front tyre, the hardened steel machine screws come to about 2 or 3 mm above the rubber, and
    are set at several different angles, the outer ones being longer above the rubber than the more
    central ones. I can't believe this tyre should let go so [relatively] easily.

    Shaun aRe
     
  9. snip

    .
    >
    > How far do the studs protrude above the level of the rubber? Are they
    domed,
    > or pointed?
    >
    > On my front tyre, the hardened steel machine screws come to about 2 or 3
    mm
    > above the rubber, and are set at several different angles, the outer ones being longer above the
    > rubber than the more central ones. I can't believe this tyre should let go so [relatively] easily.
    >
    > Shaun aRe
    >
    >
    >
    They're a flat ended cylinder about 2mm round and they protrude about 1mm.

    Nokian does make a pointed, studded tire, Freddies revenge, Check out their site.

    http://www.nokiantyres.com/bike/

    --
    DTW .../\.../\.../\...
     
  10. Shaun Rimmer

    Shaun Rimmer Guest

    D T W .../\... <[email protected]> wrote in message news:[email protected]...
    > snip
    >
    > .
    > >
    > > How far do the studs protrude above the level of the rubber? Are they
    > domed,
    > > or pointed?
    > >
    > > On my front tyre, the hardened steel machine screws come to about 2 or 3
    > mm
    > > above the rubber, and are set at several different angles, the outer
    ones
    > > being longer above the rubber than the more central ones. I can't
    believe
    > > this tyre should let go so [relatively] easily.
    > >
    > > Shaun aRe
    > >
    > >
    > >
    > They're a flat ended cylinder about 2mm round and they protrude about
    1mm.

    Cheers.

    > Nokian does make a pointed, studded tire, Freddies revenge, Check out
    their
    > site.
    >
    > http://www.nokiantyres.com/bike/

    I've seen their site, can't afford their ice tyres (Their Gazzaloddis flat out _rule_ though!!!!
    Heheheh...), and it would be wasteful anyhow, as I only see the conditions for them for a few days a
    couple or so weeks a year.

    Shaun aRe
     
  11. Shaun Rimmer wrote:

    > Cheers John.
    >
    > How far do the studs protrude above the level of the rubber?

    about 1/32"

    >Are they domed, or pointed?

    more like stepped
     
  12. Shaun Rimmer

    Shaun Rimmer Guest

    ClydesdaleMTB <[email protected]> wrote in message news:[email protected]...
    >
    >
    > Shaun Rimmer wrote:
    >
    > > Cheers John.
    > >
    > > How far do the studs protrude above the level of the rubber?
    >
    > about 1/32"
    >
    > >Are they domed, or pointed?
    >
    > more like stepped

    Cheers John.

    Shaun aRe
     
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