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Thread: COG for new TiLIte

  1. #1

    COG for new TiLIte

    Hello All,

    My new TiLite ZRA chair with ergo seating was delivered yesterday and I am in the adjusting and breaking in stage. In my old TiLite chair I had 3.5 inch COG because I like a tippy chair. Due to the ergo seating I could only get 3 inches of COG max....I miss that extra 1/2 inch of COG. Does anyone have any tips or advice how I could get another 1/2 inch or at least make me feel like I am getting
    another 1/2 inch of COG ?

    -Ronnie

  2. #2
    One way is too tilt the back rearward a few degrees.

  3. #3
    Senior Member Oddity's Avatar
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    Can you flip the camber tube clamps around to face the other direction? Sometimes that'll squeeze a little more out of it, if they're facing toward the rear to begin with.

    Edit: sorry was thinking of the ZR clamps. The ZRA is different. Might still be possible though. If you look at section 8-2, 3 of the ZRA manual, it looks like a simple thing to remove the Camber Mount Clamp and flip the whole camber tube and axle plate assembly around so the Camber Tube is in front of the Camber Clamp instead of behind it. That'd add at least an inch or two it looks like. Then you could adjust it back a bit to where you like it.
    https://permobilus.com/wp-content/up...-Z_ZRA_Web.pdf


    Might also be able to slack the back upholstery off a bit to sit deeper.
    Last edited by Oddity; 01-09-2020 at 07:48 PM.
    "I have great faith in fools; self-confidence my friends call it." - Edgar Allen Poe

    "If you only know your side of an issue, you know nothing." -John Stuart Mill, On Liberty

    "Even what those with the greatest reputation for knowing it all claim to understand and defend are but opinions..." -Heraclitus, Fragments

  4. #4
    You can add backward tippiness by increasing dump as follows: 1) lower the rear seat height, 2) raise the front seat height with taller forks, 3) raise the front seat height with larger caster, or 4) raise the front seat height by moving the caster axles to the lower hole on the fork. Of course, you can only do this if the axle is presently on the top hole of the fork. If your fork doesn't have two holes, you may drill a new hole.

    You may want to move the back angle forward in order to compensate for the increased dump.

  5. #5
    Senior Member Oddity's Avatar
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    Solutions that require changing your prescribed seating position are less than ideal, IMO. That will create changes in joint angles, posture, and pressure distribution. I'd just flip the camber tube around, keeping everything else the same, if it were mine. I've checked on my TiLite that uses the same axle plate and camber clamps and it'd be easy.
    "I have great faith in fools; self-confidence my friends call it." - Edgar Allen Poe

    "If you only know your side of an issue, you know nothing." -John Stuart Mill, On Liberty

    "Even what those with the greatest reputation for knowing it all claim to understand and defend are but opinions..." -Heraclitus, Fragments

  6. #6
    Agreed. I'd take the easier solution as well. But, other alternatives are available.

    BTW, "prescribed seating position"? Don't get me started. They really messed me up good with my seating position. Sitting too high for 5+ years ruined my shoulders. My new chair has me sitting lower (by my own prescription) and my shoulders are gradually making a comeback. I would have gone to an early grave waiting on them to figure it out.

    I know this is where you say just because one therapist was inept doesn't mean all others are. True. But it's still good to be the one who knows you best.

  7. #7
    Senior Member Oddity's Avatar
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    Yeah. Good seating therapists are hard to find it seems. Giving advice on stuff like that over the interwebnets is tough, too. I feel a certain amount of 'personal liability' that pushes me to say stuff like that. The idea of someone getting a sore off of my advice is sobering. But, I configured all my chairs but the first, too!
    "I have great faith in fools; self-confidence my friends call it." - Edgar Allen Poe

    "If you only know your side of an issue, you know nothing." -John Stuart Mill, On Liberty

    "Even what those with the greatest reputation for knowing it all claim to understand and defend are but opinions..." -Heraclitus, Fragments

  8. #8
    Point well taken. But he asked for tips and I offered ideas not recommendations. Isn't that one large reason we're here, to share experiences and ideas?

    As long as we're on the subject, a seating therapist will recommend your knees be placed below your hips. Stuff will fall out of your lap that way. It's easier to carry stuff on your lap with your knees higher (more dump). It also makes you more stable while you push and reach.

    The downside is potential for sores. That happened to me from too much dump in a Jay cushion. I can't say if it was due to dump or the Jay cushion, probably a combination of both, The jell in Jay cushions bunches from the get-go (first time you bend) to the point that it's not doing any good and you're bottoming out. Luckily, skin didn't split open. But definitely more pressure than a therapist would recommend. It's all trade off between function vs care.

  9. #9
    Oddity - what a great idea you have about reversing the camber tube clamps around. Looking at my chair I don't see why this cannot be done.

    August - yes, I am going to try raising my castor in the first hole of the fork and see if that gives me the tipsiness I am looking for.

    Thank you both.

    -Ronnie

  10. #10
    Quote Originally Posted by reaton View Post
    Oddity - what a great idea you have about reversing the camber tube clamps around. Looking at my chair I don't see why this cannot be done.

    August - yes, I am going to try raising my castor in the first hole of the fork and see if that gives me the tipsiness I am looking for.

    Thank you both.

    -Ronnie
    Raising your casters only will put the front wheels off 90o so would have to adjust the front barrel housing to be 90o .

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