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Thread: ZRA series 2 problems

  1. #11
    In addition to what I've posted previously, I think -scott-'s post in your other thread may be relevant. A clear pic from behind would definitely help.

    (tomorrow that is)


  2. #12
    I assumed you meant pictures of just the chair. How much seat dump would be best for me? How do I measure putting the back rest at 105 degrees? If you need more pictures of me in the chair it will be no problem. I'm not sure what posterior pelvic tilt means.

  3. #13
    Your seating posture does look very reclined, so it's not surprising that your chair is lifting up so easily. Having such a reclined posture not only makes the chair overly light in the front, it sucks the power from your push stroke making for a very inefficient ride.

    My first impression is that your seat dump looks to be on the shallow side. What are your current front and rear seat height measurements? Have you ever tried more dump? I think if you lowered you rear seat height (can you lower the casters, which raises the front seat height?), brought the seat angle closer to horizontal, and relaxed your calf strap so that you can tuck your feet under more, you would feel more stable.

  4. #14
    Senior Member tooley's Avatar
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    Quote Originally Posted by BTB View Post
    I've had this ZRA for 2 years and can't seem to get it adjusted correctly, even after seeing multiple seating clinicians and DME guys
    Hey man. The fact that the seating clinics have not helped you astounds me. I've never seen anyone your injury level running without at least 3 inches of dump. Looks like you've got some work cut out for yourself. Start by getting friendly with the ZRa2 User Manual - http://tilite.com/assets/pdf/Z2_Supp_0211Rev%20B.pdf

    I started with a ZRa, great starter chair because of its adjustability.

    Start by dumping the rear seat height - pg.4-2 of that manual. Looks like you'll want to go all the way, as far down as the rear will go.

    Bad news is this will affect every other thing on the chair. Good news is the ZRa2 is really user-friendly when it comes to making adjustments but it will be incredibly time consuming and frustrating at times. Like I told you about rugby - baby steps, nothing is going to feel perfect overnight.

    After dumping it out completely (I'm talking sitting on the axle) adjust your brakes and anti-tippers if necessary. Safety first!

    And now the chair is going to be extra tippy because of the current backrest angle. I wouldn't even get in it. Get the backrest angle adjusted up to within 5-6 degrees of 90 (perpendicular to the floor). The dump you put in the chair will hold you in more stable than the current reclined backrest.

    The dump adjustment is going to mess with the front wheel caster angle. see pg.5-4 for this adjustment procedure. If you don't adjust this your front wheels will speed wobble.

    Now footplate. You say your feet keep falling off. because you have a calf strap I'll assume they are slipping off the front? If so angle that puppy back by loosening the counter-sunk allen screws on the top of the footplate. Clean out the allen key holes in the screws so that the allen key can go in all the way. If not you could strip them. Angle the heel (back) end down and re-tighten the screws.

    Try it. Tweak it. Respect the fact you have the best, easiest to work on adjustable chair on the market. Soon you'll want to increase your center-of-gravity to make bumping your front wheels over stuff easier. Running a tippy chair is also easier to push because not so much of your weight is over the front wheels.

    Again, like I told you about rugby, take it easy on yourself. Try to make this a fun project with your homies. You be the brains, let them be the brawn. Seriously man, once you get this thing dialled in the world will seem to open up. For me it was a huge confidence boost, the more you know the better you feel. And fuck letting any PT/OT/DME touch your chair again, the large majority could give a fuck less because they only want to sell you another one.

  5. #15
    Great detailed advice from Tooley.

    Below is a photo (from Facebook) of Josh Anderson, a VP at TiLite. He's 6' 5", a low quad, and as you can see he's got a lot of dump in his chair. According to a recent FB post, his TR3 is setup with: FSH – 19.5"; RSH – 15". Chances are your dump should be in the 4" ballpark.



  6. #16
    Great detailed advice from Tooley.

    Below is a photo (from Facebook) of Josh Anderson, a VP at TiLite. He's 6' 5", a low quad, and as you can see he's got a lot of dump in his chair. According to a recent FB post, his TR3 is setup with: FSH ā€“ 19.5"; RSH ā€“ 15". Chances are your dump should be in the 4" ballpark.



  7. #17
    Tooley, just got started on your advice with my bud and we accidentally stripped a bolt so he's gonna go to his shop tomorrow and get a drill to fix that so we can get started on fixing this chair.

    Stephen, how is Josh able to lean on his knees like that? Is that because of all his dump? I see a lot of people do that yet my chair configuration will not let me.

  8. #18
    Quote Originally Posted by BTB View Post
    Stephen, how is Josh able to lean on his knees like that? Is that because of all his dump? I see a lot of people do that yet my chair configuration will not let me.
    Can't really say for sure. He's tucked into his chair pretty well and I guess he's got enough triceps to prop himself up by his arms.

    You can get another glimpse of him in his chair in the videos featured on the TiLite page. (Correction: he's 6' 9", not 6' 5"! All things equal, you should be a lot easier to fit.)

  9. #19
    The ActaBack is also a problem, not only is it currently mounted behind the back canes, it appears to be too tall for you to be able to get your pelvis back in the seat once the seat dump is adjusted. It needs to be moved up higher, but there will be a problem with the top half of it pushing you forward if it moved up.

    -scott-'s setup seems like it might be close to what you need. Fortunately, we can see his setup without having to get pictures because his chair is featured on the Icon Website...

    http://www.iconwheelchairs.com/photos


  10. #20
    Quote Originally Posted by BTB View Post
    Tooley, just got started on your advice with my bud and we accidentally stripped a bolt so he's gonna go to his shop tomorrow and get a drill to fix that so we can get started on fixing this chair.

    Stephen, how is Josh able to lean on his knees like that? Is that because of all his dump? I see a lot of people do that yet my chair configuration will not let me.
    That may not necessarily be a good goal to have. Josh is a quad who is 6'9" tall, has to load his chair into his car multiple times per day, and frequently travels all over the world because of his job. He has undoubtedly spent years arriving at the optimal configuration for maximal function and has had to find the best balance of trade offs between function and positioning. If his chairs had been configured to provide theoretically ideal positioning, it would be too long and too high for him to be very functional in it. The angles required for him to be able to fit his body in a reasonable compact efficient chair make it difficult for him to sit with a more-upright posteriorly-oriented resting posture.

    He tends to rely on his arms for support when he is at rest for long periods of time. This could become problematic over the long term if he habitually sat like that and wasn't spending some time out of the chair in other positions. I'm sure he has had more than his share of therapists harping on him about his posture over the years. I'm also sure he has heeded some of their advice and is being proactive.

    The fact that you are unable to lean forward clearly shows that you have a resting posture which has an excessive posterior orientation.


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