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Figuring Out Wheelchair Tires and Introduction

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    #16
    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.

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      #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.

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        #18
        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?

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          #19
          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

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            #20
            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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              #21
              Originally posted by CCryancham View Post
              Just the rim itself is 24 7/8".
              Not that it helps, but that’s the size of our rims too. Can’t believe there are no markings on the tyres though....
              Gordon, father of son who became t6 paraplegic at the age of 4 in 2007 as a result of surgery to remove a spinal tumour.

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                #22
                I measured my quickie 27" rims just like you did here.

                https://drive.google.com/file/d/1QNi...VBxZXvHl2/view

                and I got 24 15/16" with the inflated non-marking tires I get 26 7/8".



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                  #23
                  Thanks so much everyone for your help. After looking at the Sheldon Brown site provided by chasmengr earlier in the thread, I'm about 95% sure that what I have is 700C Rims (25-622). Using the measuring methods on that site I'm coming within 1.5 mm of 622 for the bead seat diameter. So, I feel like that is in the margin of error. Searching around, 700C seems to be a very common road bike rim size with lots of tire choices. The rims do have holes for tube valve stems, so I think we have the option of going the pneumatic route. At this point I'm probably leaning that way, even though the original stander came with the solid tires.

                  Still have to wonder why in the world they would somehow heat treat 24" solid SHOX tires (25-540) to fit them on a much larger rim. That is totally bizarre.

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                    #24
                    700C is what the wheelchair world calls 27". ERTRO 622.

                    Originally posted by CCryancham View Post
                    Thanks so much everyone for your help. After looking at the Sheldon Brown site provided by chasmengr earlier in the thread, I'm about 95% sure that what I have is 700C Rims (25-622). Using the measuring methods on that site I'm coming within 1.5 mm of 622 for the bead seat diameter. So, I feel like that is in the margin of error. Searching around, 700C seems to be a very common road bike rim size with lots of tire choices. The rims do have holes for tube valve stems, so I think we have the option of going the pneumatic route. At this point I'm probably leaning that way, even though the original stander came with the solid tires.

                    Still have to wonder why in the world they would somehow heat treat 24" solid SHOX tires (25-540) to fit them on a much larger rim. That is totally bizarre.

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