rec.sport.unicycling · Public discussion

Air pressure experiment w/ Big Apple

Started by underdog · · Last activity · 9 posts · 527 views

This thread is locked and is currently read-only.

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
rec.sport.unicycling
Published
17 April 2006
Last activity
19 April 2006
Original author
underdog
Posts
9
Discussion status
Public discussion
Total views
527
Views / 30 days
0
Topics

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

Showing posts 1–9 of 9
Posts remain in their original chronological order.

Text size
  1. OK. So I've been getting really frustrated with a riding problem I've
    been having with my 29er. I tend to ride it pretty crooked. I'll be
    cruising along down the road, and in order to keep it straight, my
    body's twisted WAY to the right with my left arm pointing ahead and my
    right arm pointing behind. This is really starting to p*ss me off. I
    don't have this problem with my 24" Torker but it's prevalant w/ my
    homebuilt 29er. The uni is straight. I put it on a super flat welding
    table we've got at work and used precision gage blocks under the forks
    and there is no twist at all to the frame. The wheel is nice and true
    and I've got a friend who's ridden it and he said it feels just fine to
    him. Oh yeah, the seat is on as straight as I can possible get it by
    eyeball.

    I've read in other posts that the Schwalb Big Apple seems to be
    sensitive to little things like the road crown but I've tried riding on
    both sides of the road and this doesn't seem to help. Yesterday, I
    decided to mess around with tire pressure.

    I weigh 180 lbs. and I tried the following pressures. I would start in
    my garage and use a hand pump with a built in pressure gage and then
    ride around a couple of blocks always going the same route and on the
    same side of the road just for consistency.

    25 psi (lowest my gage would read); Tire was very soft and mushy. Just
    plain old difficult to steer. Decided I just couldn't ride here. Soft
    enough that I think I'd pinch flat if I dropped off a curb.

    30 psi; Couldn't tell any difference from 25 psi.

    35 psi; More controllable but still felt like I'm riding 'crooked.'

    40 psi; Slight improvement over 35 psi.

    45 and 50 psi; These pressures felt the best to me. I still felt like
    I'm riding a bit crooked but it was the least pronounced at this
    pressure.

    55 and 60 psi; I'd say that these pressures were the worst. I
    couldn't tell a difference between the two and my crooked riding was
    the most pronounced.

    I still beleive that I've got some riding technique 'issues' going on
    but I also think that this tire is fairly sensitive to pressure. Too
    low and it's just mushy. Too high and I think that I end up with too
    much of a point contact at the road and the round tire profile wants to
    kind of roll off to the side a bit. I dunno, it's just a
    theory🙄

    Anybody got any suggestions or comments? Something I might have
    overlooked? Should I maybe try a Nanoraptor or just keep riding 'til I
    figure out how to overcome this whole crooked thing?

    It kinda sucks 'cause I'd love to ride my 29er more but I keep
    gravitating to my 24 because I ride it so much better.

    --
    underdog

    'I tell you, we are here on Earth to fart around, and don't let anybody
    tell you different' - Kurt Vonnegut
    ------------------------------------------------------------------------
    underdog's Profile: http://www.unicyclist.com/profile/6197
    View this thread: http://www.unicyclist.com/thread/48614

  2. underdog said:


    Anybody got any suggestions or comments? Something I might have
    overlooked? Should I maybe try a Nanoraptor or just keep riding 'til I
    figure out how to overcome this whole crooked thing?

    I think it's just a question of practice. One thing you might try is
    changing which hand is on the handle to see if that straightens you out
    (or overcorrects). But mostly, you'll just get straighter as you get
    more comfortable on the 29er and are fighting it less.

    I don't think a Nanoraptor is likely to solve your problem. The
    Nanoraptor does perform better in loose dirt situations, but on the
    road the Big Apple is significantly better.

    --
    tholub
    ------------------------------------------------------------------------
    tholub's Profile: http://www.unicyclist.com/profile/804
    View this thread: http://www.unicyclist.com/thread/48614

  3. Try lightening the pressure on your pedals until you're just barely
    pushing them. Be sure to concentrate on each/both sides.

    Sometime leg dominance gets into a state where it gets worse and worse,
    and in this situation the body's set gets way off. By doing the
    lightening bit, you help back the dominant side off to match the
    non-dominant side better.

    It wouldn't hurt to work on this on a non-inclined surface for a while.

    --
    U-Turn

    Weep in the dojo... laugh on the battlefield.
    'LiveWire Unicycles' (http://www.livewireunicycles.com)
    'Strongest Coker Wheel in the World'
    (http://www.unicyclist.com/gallery/albup39)
    '29er Tire Study' (http://u-turn.unicyclist.com/29erTireStudy/)
    'New York Unicycle Club' (http://www.newyorkunicycle.com)
    -- Dave Stockton
    ------------------------------------------------------------------------
    U-Turn's Profile: http://www.unicyclist.com/profile/691
    View this thread: http://www.unicyclist.com/thread/48614

  4. I ride 2 29ers - one with 150mm cranks and kenda claw tyre and another
    with 125mm cranks and the Big Apple tyre. I find that there are similar
    problems with road crown with both of them. I am quite heavy and I ride
    them both with the tyre so hard I can barely get any more air in with
    my littlest pump. Probably about 70 psi.

    Although I would hesistate to give anyone advice as most people are
    much better than me, I do have an observation to share with you.

    I have been practicing riding with my hand on the handle - I'm not very
    good and with anything approaching bumpy I still have to wave the old
    arms for balance. BUT I have found that sometimes when I'm riding along
    my right shoulder and arm 'twists' inward and my left arm goes out
    behind me. I find that this is rectified by putting slightly more
    weight onto the left foot. My arms just sort of naturally return to
    being relaxed and facing forward.

    I don't know if this will help you at all.

    Cathy

    --
    cathwood

    Say no to unicycle genre discrimination! - MrBoogiejuice

    http://www.chuckingandtwirling.co.uk
    ------------------------------------------------------------------------
    cathwood's Profile: http://www.unicyclist.com/profile/9425
    View this thread: http://www.unicyclist.com/thread/48614

  5. I ride a big apple on my 29" and it's a bit low (my air pump is f'ed
    up). I haven't had any notice of leaning one way or the other.

    I don't hold the handle other than mounting and I ride on all sorts of
    uneven surfaces (the parking lot that I tend to ride in has a very
    uneven grade).

    I'll see if I notice anything subtle tonight, but I haven't noticed
    anything yet.

    --
    bmemike
    ------------------------------------------------------------------------
    bmemike's Profile: http://www.unicyclist.com/profile/11148
    View this thread: http://www.unicyclist.com/thread/48614

  6. underdog said:

    "OK. So I've been getting really frustrated with a riding problem I've
    been having with my 29er. I tend to ride it pretty crooked. I'll be
    cruising along down the road, and in order to keep it straight, my
    body's twisted WAY to the right with my left arm pointing ahead and my
    right arm pointing behind. This is really starting to p*ss me off. I
    don't have this problem with my 24" Torker but it's prevalant w/ my
    homebuilt 29er. The uni is straight. I put it on a super flat welding
    table we've got at work and used precision gage blocks under the forks
    and there is no twist at all to the frame. The wheel is nice and true
    and I've got a friend who's ridden it and he said it feels just fine to
    him. Oh yeah, the seat is on as straight as I can possible get it by
    eyeball."

    I think you might be on to something with the tire thing. I have
    exactly the same thing happening. onl I didnt switch to a new uni I
    switched to a new innertube in my tire. Where I live they are building
    a lot of new houses so I was getting flats all the time to i switched
    out my reular tube for one of those thick rubber "puncture proof" tubes
    filled with slime (that green stuff that seals punctures). Right after
    I swapped tires the weather got bad and then I got busy so I didnt ride
    for about a week after I changed the tire. The first time I got on I
    noticed I had to fight the Uni to stay in a straight line and I was
    riding left shoulder forward and pumping hard with my right leg. I put
    it down to something I had adjusted incorrectly when putting my tire
    back on. So over the next few weeks I started tweaking the uni before
    every ride, loosten the bearing clamps, tighten the bearing clamps ,
    twist the seat more one way then the other, I even went as far as to
    put padding under one butt cheek to see if I was just sitting crooked.
    It never dawned on me that it might be the tire since i pumped it to
    the same psi as the old one. I think I'm going to change back to a
    regular tube and see if it helps...

    --
    sticknui

    "Duct tape is like the Force. It has a light side, a dark side, and it
    holds the universe together...."
    ~ Carl Zwanzig
    ------------------------------------------------------------------------
    sticknui's Profile: http://www.unicyclist.com/profile/9806
    View this thread: http://www.unicyclist.com/thread/48614

  7. It's true that the Big Apple is prone to this behavior anyway. I don't
    have any experience with them on a uni but I have them on the my road
    bike which I use to commute every day. I can tell when the pressure is
    getting soft becasue I get under steer when cornering and it twitches
    going over the edge of manhole covers etc as the wheel tries to grab a
    line I am not steering in. Obviously it isn't a big prblem with two
    wheels but very noticable and it corrects as soon as I pump up the
    tires again. I think this tire squishes around at low pressure like a
    studded tire does. Also on a narrow rim there is very little lateral
    stability.

    Andy

    --
    andytait
    ------------------------------------------------------------------------
    andytait's Profile: http://www.unicyclist.com/profile/11766
    View this thread: http://www.unicyclist.com/thread/48614

  8. U-Turn said:

    Sometime leg dominance gets into a state where it gets worse and worse

    To correct this problem, I recommend tieing your dominant foot to your
    waistband for a day or two, and hopping around on your non-dominant
    foot. Build up the muscles in your non-dom leg and you'll be in better
    shape.

    --
    maestro8

    Those are my principles. If you don't like those, I have others. --
    Groucho Marx
    ------------------------------------------------------------------------
    maestro8's Profile: http://www.unicyclist.com/profile/7871
    View this thread: http://www.unicyclist.com/thread/48614

  9. maestro8 said:

    To correct this problem, I recommend tieing your dominant foot to your
    waistband for a day or two, and hopping around on your non-dominant
    foot. Build up the muscles in your non-dom leg and you'll be in better
    shape.

    That's a good idea🙄 I've taken a slightly different tact to
    correcting a very dominant right leg. I've been trying to do more of
    my mounting left footed and trying to idle left footed. It's really
    hard for me to stay focused on it though. At my meager lever of
    riding, a little frustration goes a long ways. I still relish the
    successes so when I start getting a little frustrated at not being able
    to mount or idle consistently I revert back to my dominant foot.😠
    and my 24"

    I'm hearing real mixed reviews on the Big Apple here. I'm thinking a
    good experiment might be to put something like 700c X 32 road tire on
    it just for fun and see what happens. I'll keep you posted.

    I'm still betting that it's just bad technique.

    --
    underdog

    'I tell you, we are here on Earth to fart around, and don't let anybody
    tell you different' - Kurt Vonnegut
    ------------------------------------------------------------------------
    underdog's Profile: http://www.unicyclist.com/profile/6197
    View this thread: http://www.unicyclist.com/thread/48614

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.