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Thread: Figuring Out Wheelchair Tires and Introduction

  1. #11
    Are you sure you're measuring that rim diameter correctly???? That's an enormous rim if so. By my calculations probably even larger than 590 size rims (590 is two "wheelchair sizes" higher than 540). Maybe it's even a 700c rim or something crazy like that. It's really hard to tell without any sizing marked on the wheels themselves.

    If they're advertising them as 26", my best guess would be it's a 590 rim, which would explain the difficulty of mounting a 540 tire to it (though it doesn't explain what possessed them to mount that tire in the factory!?!?!?). Unfortunately 590 is not a size of tire that you can easily purchase at a bicycle shop, so there's no easy way to test whether or not this is the correct size. Of course if they're referring to 26" wheels in bicycle terms rather than wheelchair terms that would typically be a 559 tire. The medium size on their website that you linked to just says 26", which as I think we've beaten to death doesn't mean much, but it definitely does rule out 540 mm size which both of your tires are.

    If you want to get a more accurate measurement of the true rim diameter (with no bending of the measuring tape), maybe set the rim upright and measure it's height from the floor? I'm pretty sure your measurement is overestimating it, but there's no way to tell whether you are overestimating it just a tad and it's 590 or you're overestimating it by more than an inch and it's a 559.

    Of course you could always just buy the cheapest 590 tire and see if it fits before you waste your money on a set of those tubeless tires.

    Also it's pretty dastardly that they mounted a tire that's too small for the rim, tricking you into buying the wrong tires when it was time to change them and causing you this headache. Those folks should be ashamed of themselves... and I almost hope they really do have specialty equipment for heating and mounting the wrong sized tires because they're too stupid to figure out that they have the wrong sized tires.... the thought of that does make me giggle.

  2. #12
    Senior Member NW-Will's Avatar
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    Quote Originally Posted by CCryancham View Post
    We have the K150 stander with what they show as 27" wheels in that link.
    Totally feel your frustration... everything seems like a battle with suppliers and manufacturers. They could make life so much easier for everyone by just putting useful information out there.

    From your pictures.. https://drive.google.com/file/d/18xG...c2KDGqxiF/view

    These are 24*1 tires 24" wheels in the wheelchair world ERTRO 540mm. but all the measurements you're taking with the tape don't seem to make sense.

    I have no experience with the shox solid tires.. but that would seem impossible going from 24" to 27" wheels in wheelchair wheel language.

    None of their standers mention a 24" wheel diameter !!!

    https://cdn-rifton.azureedge.net/pro...tab=dimensions

    They have wheel diameters of (K110) 20", (K130) 20", (K150) 27", & (K170) 35"

    SHOX does make a 27" * 1" tire !! https://www.cewheelsinc.com/wheels/2...urethane-tire/

    if this is as tight as you can pull the tape https://drive.google.com/file/d/1ZrZ...7XaFB4Aab/view i think i'd be temped to give the 27" tires a punt ! about $50 a pair??

  3. #13
    Quote Originally Posted by NW-Will View Post
    Totally feel your frustration... everything seems like a battle with suppliers and manufacturers. They could make life so much easier for everyone by just putting useful information out there.

    From your pictures.. https://drive.google.com/file/d/18xG...c2KDGqxiF/view

    These are 24*1 tires 24" wheels in the wheelchair world ERTRO 540mm. but all the measurements you're taking with the tape don't seem to make sense.

    I have no experience with the shox solid tires.. but that would seem impossible going from 24" to 27" wheels in wheelchair wheel language.

    None of their standers mention a 24" wheel diameter !!!

    https://cdn-rifton.azureedge.net/pro...tab=dimensions

    They have wheel diameters of (K110) 20", (K130) 20", (K150) 27", & (K170) 35"

    SHOX does make a 27" * 1" tire !! https://www.cewheelsinc.com/wheels/2...urethane-tire/

    if this is as tight as you can pull the tape https://drive.google.com/file/d/1ZrZ...7XaFB4Aab/view i think i'd be temped to give the 27" tires a punt ! about $50 a pair??
    If you go to the order form they do call the wheels 26" (not 27") when you are actually ordering the medium sized stander, but they don't explain what that means.

  4. #14
    Senior Member NW-Will's Avatar
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    They want to keep it mysterious

    I'm losing faith with everyone.. .every single company I am dealing with at the moment has the shitiest support, they're all making comcast look good, so frustrating.

    Quote Originally Posted by funklab View Post
    If you go to the order form they do call the wheels 26" (not 27") when you are actually ordering the medium sized stander, but they don't explain what that means.

  5. #15
    Quote Originally Posted by NW-Will View Post
    They want to keep it mysterious

    I'm losing faith with everyone.. .every single company I am dealing with at the moment has the shitiest support, they're all making comcast look good, so frustrating.
    Oh yeah. Absolute frustration. I'm like, "why can't you just tell me what tires to buy."

    So, it was a good idea to stand the rims upright and measure that way. It looks like my measurements were pretty close. I made a little jig out of plywood to get an accurate measurement with the rims standing upright. The assembly with the tire mounted is 26 1/4". Just the rim itself is 24 7/8". Plus or minus 1/32" on each measurement.

    What do you think? I guess at this point I could order some 26" (590) and be really careful with them when mounting so I can return them if they don't work out. And if that doesn't work go for those 27". I guess even if I bought 2 of each that is better than spending the $700 for the full assembly.

  6. #16
    Quote Originally Posted by NW-Will View Post
    .... i think i'd be temped to give the 27" tires a punt ! about $50 a pair??
    It is as if the original old worn out pair were size mis marked. Clearly 24's won't work. I think Will's suggestion is a good one especially since 27 is one of the sizes the factory specifies.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

  7. #17
    27" is such a bizarre tire size, but based on the websites I can find it does seem like a 590 rim shouldn't be more than about 24.25 inches at the most, even if you're giving a lot of extra room to account for a deep bead depth (like a half inch on each side).

    Even the website contradicts itself, stating that the wheel size is 26" but that the wheel diameter is 27", but still never bothering to actually list what wheel they're putting on it or even giving a width.

  8. #18
    Suspended Andy's Avatar
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    Quote Originally Posted by CCryancham View Post
    Here is the outside diameter of the unmounted rim:
    https://drive.google.com/open?id=1QN...Q8KpZVBxZXvHl2
    I have a 26" wheelchair wheel made by Sun in the closet (590), CR20 model, but I'd assume rather similar. That measures 23 3/4. So I think you are looking for 27" wheelchair size, which translates into ???

    Clear as mud, huh?

  9. #19
    Suspended Andy's Avatar
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    Quote Originally Posted by CCryancham View Post
    I guess at this point I could order some 26" (590) and be really careful with them when mounting so I can return them if they don't work out. .
    I would be the last person on earth wanting to try stretching a tire 1" onto a larger rim. Horrifying! lol

  10. #20
    Quote Originally Posted by CCryancham View Post
    ...

    Here is the outside diameter of the unmounted rim:
    https://drive.google.com/open?id=1QN...Q8KpZVBxZXvHl2...
    It shows you have an outside rim diameter of 24 7/8".
    I have a 25 inch spinergy wheel here. It has an outside rim diameter of only 22 5/8".
    I also have a 26 inch spinergy wheel. It has an outside rim diameter of 23 7/8" (an inch smaller than yours).
    Since your wheel is a different brand, a 27" tire is still in the ballpark.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

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