Easy Coker Airfoil tire change

Discussion in 'rec.sport.unicycling' started by john_childs, Aug 3, 2004.

  1. john_childs

    john_childs Guest

    Last year I had the pleasure of trying to install a Coker tire on an
    Airfoil rim. I had a *very* difficult time trying to get the tire on
    the rim. I had such a difficult time that I wrote a thread about it:
    'Putting a Coker tire on the Airfoil rim' (http://tinyurl.com/48pvc).

    When I got home from NAUCC this year I had the pleasure again of
    installing a new Coker tire on the Airfoil rim. This time it went
    *much* easier.

    At the beginning of the 10K at NAUCC I noticed that I had about a 1/2"
    cut in the tread of my Coker tire. The cut was in the center area of
    the tread. Fortunately it wasn't on the sidewall, and fortunately it
    didn't go all the way through the casing. But it was clearly a bad cut
    and I was going to have to replace the tire. Bummer. The tire still
    has lots of tread left.

    This time the tire change was much easier. The trick was switching to a
    different rim tape. Last time I used Velox rim tape. The Velox rim
    tape is good stuff, but it's rather thick and not very slippery. The
    thickness makes it more difficult to install the tire. The lack of
    slipperiness makes it more difficult to get the tire to slide all the
    way into the center lowest part of the rim channel during the tire
    install.

    This time I tried 'Rox Ultralight Rim Strip' (http://tinyurl.com/6y4ne).
    This rim strip is very thin and very slippery. I'm not sure it would
    do well in a super high pressure road bike tire (120 psi to 160 psi),
    but for the Coker tire the Rox rim strip should have enough substance to
    keep the tube away from the nipples and spokes. A single roll contains
    two rim strips which is enough to do two bicycle wheels or one Coker
    wheel.

    The Rox Ultralight Rim Strip made the Coker tire install sooooo easy. I
    did the tire install using two 'Quik-Stik' (http://tinyurl.com/54vrd)
    tire levers and a bicycle toe strap. I used the toe strap as a third
    pair of hands to hold the tire in the center part of the rim channel
    while I used the tire levers on the opposite side of the wheel. Easy.
    The Rox rim strip allowed the tire to easily slide all the way into the
    center area of the rim channel (where the diameter of the rim is the
    smallest). The toe strap held it there. Prying the rest of the tire
    over the rim was easy. I think I could have actually pried the rest of
    the tire over the rim without any tire lever tools at all if I had to.
    Wow!

    The big trick is the Rox Ultralight Rim Strip. U-Turn has been using
    Salsa rim tape, but I couldn't find the Salsa tape at any local bike
    shops. I was able to find the Rox rim strip. I haven't tried the Salsa
    tape so I don't know how well it works and how easy the tire install
    would be. The Salsa rim tape is thicker than the Rox Ultralight rim
    strip so I would expect the tire install using the Rox Ultralight rim
    strip to be easier.

    No longer am I scared of repairing a Coker flat out on the road. I know
    I could do it if I have to.

    Rox Ultralight Rim Strips rock!


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  2. Sofa

    Sofa Guest

    LBS, here I come!

    Thanks John


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  3. muddycycle

    muddycycle Guest

    The last time you changed the Coker tire was in October. How hot was it?
    This is August and a hot one at that. I left my Coker in the sun for
    about an hour and was able to remove the tire without any tools, I was
    just wondering if that made it different for you.


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  4. john_childs

    john_childs Guest

    In both cases the tire was at indoor temperature. Not enough of a
    temperature difference to expand the tire. In both cases it was a brand
    new Coker tire.

    The big difference really was the rim strip. With the Rox rim strip the
    tire slid easily down into the center channel area of the rim. With the
    Velox rim tape the tire would get hung up on the edge of the rim tape
    and would not slide down. With the Velox rim tape the tire was actually
    dislodging the rim tape during the install. It was a real hassle.


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  5. john_childs

    john_childs Guest

    Now that people are back from UNICON I'll bump this up.

    I'm curious if anyone has experience with the Rox Ultralight Rim Strip
    in a Coker or any other wheel. The Rox rim strip is really really thin
    which kind of makes me nervous about it. It's so thin that it makes you
    wonder just how it can hold.

    I'm going to wait about a month and then deflate the tire so I can look
    at the rim strip to see how it's holding up. Hopefully the rim strip
    will be fine and I can stop worrying about it.


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  6. john_childs

    john_childs Guest

    I took the tire off my Coker last week. When I took the tire off I
    noticed that the Rox Ultralight Rim Tape had slipped in a few places and
    exposed some spoke hole edges. Not good. It doesn't look like the
    adhesive on the tape is strong enough to keep it in place in the Airfoil
    rim. Bummer.

    I'm not sure what caused the tape to move. I stretched the tape tight
    when I installed it. It was in place when the tire was installed back
    in August. Then I check it again about a month later and it was still
    in good shape (I just deflated the tire and took a peek inside without
    removing the tire). Now I check it in April and there were two sections
    where the tape had moved over and exposed the edges of some spoke
    holes.

    Oh well.

    I'm trying three wraps of electrical tape now for the rim tape. That
    should work OK. Three wraps of electrical tape is a bit thicker than
    the Rox tape and it was slightly more difficult to install the tire.
    But only slightly more difficult. No great difficulty getting the tire
    back on. I hope the electrical tape holds up.

    I'm going to try the electrical tape for a month or so and then check it
    to see if it's staying in place. If it's good then I'm going to
    consider switching to a 29er tube instead of the stock Coker tube. I'm
    not going to try a 29er tube until I can find a rim tape solution that
    is going to stay in place. The 29er tube won't be as forgiving about
    exposed spoke hole edges compared to the stock Coker tube.


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  7. Tellurider

    Tellurider Guest

    Electric tape is what i have used for years, use a high quality electric
    tape, and I only use two layers and I have never had a problem. Maybe
    that's why I had no trouble getting my coker tire on the new bigger
    airfoil rim.


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  8. One on one

    One on one Guest

    Tellurider wrote:
    > *.... use a high quality electric tape, and I only use two layers and
    > I have never had a problem. *



    Definitely use a high quality tape, because the cheap stuff will end up
    turning into a sticky mess as it gets hot. The dark anodized airfoil rim
    is bound to get pretty heated up in the summer sun.


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  9. i buy all my electrical tape from the dollar store.

    a few wraps has been on each of my many tires (bikes and uni's) and i
    have never had to replace it

    side note:

    I heard there was now clear duct tape!

    edit: I believe you yanks have something similar, 'the Dime Store?


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  10. harper

    harper Guest

    Brian MacKenzie wrote:
    > * I believe you yanks have something similar, 'the Dime Store? *



    The eighty cent store.


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  11. bugman

    bugman Guest

    harper wrote:
    > *The eighty cent store. *



    The Dollar Store.


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  12. leeman180

    leeman180 Guest

    *Bump*

    Not too long ago I tried to put a 29" tube, and a Brand New Coker Tire
    on my new airfoil rim with the help of my Dad and two metal tire levers.
    We didn't use any lubricant, or special rim tape, and we managed to
    pinch the 29" tube and put a hole in it. But we did get the tire on. It
    was pretty hard to get the tire on, but not impossible.

    Today I patched up the 29" tube and we went to try to put the tire on
    again. I put electrical tape over the current rim tape to allow the 29"
    tube to slide better. The tube we got on ok, but we coulnd't manage to
    get the tire on this time! The tire was on almost all of the way with
    less than a foot of the bead that was off of the rim, and we were
    pulling the little metal levers as HARD as we could. Out of the both of
    us, we just couldn't get the tire on.

    Sooo, we decided to bring it to our LBS, 1000 feet down the road. They
    were amazed at the size of the Airfoil rim and Coker tire, naturally.
    After 15 min of extreme prying, they popped our tube again, and couldn't
    get the tire on. They actually considered it impossible. Since they
    popped the tube they also gave me another one for free and didn't charge
    for labor. They were really nice about it. Plus, they even broke 4 of
    their tire levers just trying.

    But the people at our LBS did have one suggestion: to heat up the tire
    either by sticking it in the dryer or using a heat gun. Anybody ever
    done this? I am thinking that if I use a heat gun, I should heat the
    tire while it is already on the rim. That way, it won't cool down by the
    time it takes to get it on because it's already on. Would this be
    okay?

    I am extremely frustated right now because even the LBS guys said it was
    impossible :( . Could I have gotten a defect tire that is too small, or
    a rim too big? Think of it this way, trying to stretch a non- stretching
    material, like the tire, over something that is way bigger than it, the
    rim... It looks like I am damaging the tire with the amount of force
    being applied by the tire levers.

    If heating up the tire to get it to expand is ok then I plan on doing
    that next. Also, using a lubricant such as water and soap.

    Thanks for your replies,
    Lee


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  13. get some metal tire levers (the kind they use for downhill bikes and
    motor cycles)

    [image:
    http://www.cyclingnews.com/photos/2003/tech/reviews/park_levers/parklever1.jpg]


    a typical plastic lever would probably go from the right hand side of
    the pictured lever tothe right hand side of the logo section

    you should get 1 (2 would be better, but one does the trick)


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  14. One on one

    One on one Guest

    leeman180 wrote:
    > **Bump*
    > If heating up the tire to get it to expand is ok then I plan on doing
    > that next. Also, using a lubricant such as water and soap.
    >
    > Thanks for your replies,
    > Lee *



    I used shaving cream as a lubricant on the tire. It worked very well.
    You also have to get the tire thats on the rim into the well of the rim.
    This will give you a little bit more tire to pull over the rim to get it
    on. Squeeze the tire beads together to get it centered into the well. It
    can be done. I have one of the "defective rims" and I was able to get
    the tire mounted without much trouble. The "defective rims were a little
    bit larger which made mounting the tire harder. Once you get the tire on
    the rim, pump it up to about 65 lbs. That will seat it properly. Good
    luck.


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  15. with the proper tools, you won't need gimmicks like lubricant and
    heating guns


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  16. One on one

    One on one Guest

    Brian MacKenzie wrote:
    > *with the proper tools, you won't need gimmicks like lubricant and
    > heating guns *



    With a common household lubricant, you won't have to invest in tools.:D


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  17. One on one wrote:
    > *With a common household lubricant, you won't have to invest in
    > tools.:D *



    you'll have a tire lever on the trail when you need it, even if you are
    freshly shaven



    :D


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  18. One on one

    One on one Guest

    Brian MacKenzie wrote:
    > *you'll have a tire lever on the trail when you need it, even if you
    > are freshly shaven
    >
    >
    >
    > :D *



    Having smooth legs is a plus especially for summer riding.
    Who the heck rides a Coker on the trails anyway?
    :D


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  19. U-Turn

    U-Turn Guest

    You guys can shave each other in the middle of a lap...

    Quite seriously, you should be able to put the tire on with no tools and
    no lube. The bead-in-the-channel thing is the trick. Recall rim or
    not.

    Heating up the tire is not a good idea, IMHO.

    Bring your Coker to a NYUC meeting, and I'll show you in person. :)


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  20. john_childs

    john_childs Guest

    The Coker tire can be very difficult to get on an Airfoil rim. The
    proper tire mounting procedure needs to be followed to make it a humanly
    possible job.

    Get the bead of the tire down into the deepest part of the rim (where
    the diameter for the rim is the smallest) while you're putting the tire
    on. I use old-school bicycle toe straps to hold the tire in place. Get
    the bead into the center part of the rim and cinch it down with a toe
    strap. Then move to a place about 1-1/2 feet away and cinch that spot
    down too with a toe strap. Now start prying the tire over the rim
    working to a final spot that is on the opposite side from the toe
    straps. As you're working the bead over the rim keep pushing it down
    into the center part of the rim as you go along. For the last bit you
    can use a metal tire lever or a very stout plastic tire lever (like the
    Pedros lever). See the picture in 'this thread'
    (http://tinyurl.com/8b52e).

    Heating the tire sounds like a very bad idea. It is completely
    unnecessary and could possibly damage the tire. The tire isn't going to
    expand when it gets heated. All the heat will do is possibly make the
    tire more pliable and easier to work with. The heat isn't going to make
    the diameter of the bead bigger.

    A little silicone spray lubricant works well. If you're using a brake
    you'll want to keep the silicone spray off of the brake surface or else
    clean the brake surface with something after you're done. I just spray
    the bead of the tire with silicone spray. That makes it a little easier
    for the tire to seat after it is installed and inflated for the first
    time.

    I gave up on the electrical tape. The tape didn't stay in place well
    enough. It wanted to creep. I didn't trust it to stay in place.

    Continental makes a 'rim tape' (http://tinyurl.com/dgtvr) that I want to
    try. Next time I change my tire I'll give it a try.

    Right now I'm using yellow 16 mm wide 'Pedro's'
    (http://www.pedros.com/frames/tools.html) rim tape. It's nylon fabric
    style tape. But the adhesive didn't seem as strong and sticky as I
    would like.


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