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Wheelchair vs bike tyres and wheels

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    Wheelchair vs bike tyres and wheels

    Are they measured the same way? I've been trying to get 25inch tyres for my chair, so I ring them up, get told, "Yeah. We have them in stock." Go to store to buy them. To be told "Who told you we had that size?". It's happened 4 times. I go to local wheelchair reseller and get told "we dont have those... It's gonna take a month to get them from America...". almost dropped au$500 on a pair of 26" bike rims thinking I'd always be able to get tyres and tubes for that size. Then I realise "Chair geometry". Omg...
    Everybody wants freedom.... They just don't want it for everybody else...

    A college professor, a man I now consider my dad, once told me...
    "The minute you let someone decide what you can and cannot do, your life is no longer yours." A truer word has never been spoken in my opinion.


    Professor Bill Johnston
    (1930- )

    #2
    Use the ETRTO size of your wheel.. it measures to the bead.. and you'll be sure you have a tire that fits your rim.
    Basically a standard wheelchair
    24" wheel is 540
    25" wheel is 559
    26" wheel is 590
    27" wheel is 622

    Tire sizing is a black art (Joke).. if you want to understand more there is plenty via google that tries to explain it sheldon brown has a good explanation. http://www.sheldonbrown.com/tire-sizing.html

    Comment


      #3
      Seems like wheelchair rims and bike tyres are completely incompatible...
      Everybody wants freedom.... They just don't want it for everybody else...

      A college professor, a man I now consider my dad, once told me...
      "The minute you let someone decide what you can and cannot do, your life is no longer yours." A truer word has never been spoken in my opinion.


      Professor Bill Johnston
      (1930- )

      Comment


        #4
        If you have 25" (as NW-Will wrote, 559 bead size) you can be happy.
        You'll have plenty of choice in bike shops, as many MTB use the same size…
        C6-7 since mid 2002, no hand control nor triceps.
        my website & my job (in France): Accessibility advisor www.acceslibre.eu
        Also working on a French research about Peer counseling and Empowerment.

        Comment


          #5
          You need to consider wheel rim width as well. A mountain bike 559 is also called a 26 but typically are wider rim for a wider mtb tyre. To further confuse things 27/622 erto is the same erto as 700c road bike wheels and 29 inch mtb wheels. https://www.evanscycles.com/coffeest...d-measurements is a useful guide.

          Comment


            #6
            Unfortunately, there is no such "Taobao" like China, anything

            Comment


              #7
              Originally posted by robotnik View Post
              If you have 25" (as NW-Will wrote, 559 bead size) you can be happy.
              You'll have plenty of choice in bike shops, as many MTB use the same size…
              Unfortunately the mountain bike tyres dont come in 1". They are usually well over 2". Not gonna fit on my rims
              Everybody wants freedom.... They just don't want it for everybody else...

              A college professor, a man I now consider my dad, once told me...
              "The minute you let someone decide what you can and cannot do, your life is no longer yours." A truer word has never been spoken in my opinion.


              Professor Bill Johnston
              (1930- )

              Comment


                #8
                Originally posted by Mutley View Post
                Unfortunately the mountain bike tyres dont come in 1". They are usually well over 2". Not gonna fit on my rims
                If you are using 25" wheels then the current tires on your wheels have the ETRTO 559-25 (something close to 25 depending, that's the width) stamped on them somewhere then they have a 559 bead.

                Then as long as you buy your tires using the Etrto sizing they will fit your rim.
                As an example I took these pictures for another experiment.. but all of the wheels are wheel chair wheels either 25", 26" or 27" and 1" wide. The pictures are demonstrating using different tires I'm accomplishing a 27" outside diameter on the tires no matter which rim I am using.

                this is a 27" rim next to a 25" rim.


                and here 25", 26", 27" etc.


                Comment


                  #9
                  I run Bike tires all the time. I realize you are not here in the states but I would think you would have the same selection if not more over there. I do not know if they ship outside united states but here is a good selection at this site https://www.niagaracycle.com/categor...26-x-1-00-1-75 and I have been running these for a while now and really like them
                  http://www.wiggle.co.uk/schwalbe-mar...mtb-city-tyre/

                  Comment


                    #10
                    Australia doesnt use the ERTRO measurement system and websites with conversion tables confuse me no end. Mainly because they're focused on bike sizes. I heard tho, that a 25" wheelchair tyre is actually a 26" bike tyre. I most definately might be wrong tho. I found out that 26" tyres are hard to come by as well.
                    Everybody wants freedom.... They just don't want it for everybody else...

                    A college professor, a man I now consider my dad, once told me...
                    "The minute you let someone decide what you can and cannot do, your life is no longer yours." A truer word has never been spoken in my opinion.


                    Professor Bill Johnston
                    (1930- )

                    Comment


                      #11
                      ETRTO is an ISO standard it's world wide.
                      Unless you've found an Australian bike tyre manufacturing plant, you're buying imported tyres, therefore they'll be stamped with ETRTO numbers. (maybe freaking tiny sometimes but they'll be there).

                      Couple of Australian bike companies explaining tyre sizing for you.

                      https://adelaidebikeworkshop.files.w...tyre-sizes.pdf
                      http://www.moruyabicycles.com.au/con...-uk/d1097.html

                      Just go to the schwalbe site https://www.schwalbe.com/ when you search for tyres it gives you an option to sort by ETRTO sizes then you can see exactly what choices you have, find something you like, look at the product page.. and it'll give you the sizing in English, French, German or what takes your fancy.

                      Depending who I talk to my 662 tyres are 700C, 29", 28", or 27" at the end of the day if the tyre is stamped with 622 I know it'll fit my rim, no fuss.

                      Comment


                        #12
                        I've got 25 inch Marathon Plus Evolutions and they have no size on them. First tyre I've ever seen without a size on it. Mind you I haven't seen inside the tyre as it is on a rim...
                        Everybody wants freedom.... They just don't want it for everybody else...

                        A college professor, a man I now consider my dad, once told me...
                        "The minute you let someone decide what you can and cannot do, your life is no longer yours." A truer word has never been spoken in my opinion.


                        Professor Bill Johnston
                        (1930- )

                        Comment


                          #13
                          Originally posted by Mutley View Post
                          I've been trying to get 25inch tyres for my chair, so I ring them up, get told, "Yeah. We have them in stock." Go to store to buy them. To be told "Who told you we had that size?". It's happened 4 times.
                          Yes, there are several issues here. You firmly believe that you need 25" tires because that's how wheelchair tires are marketed as. But 25" tires don't exist as a standard size. So of course the bike shop doesn't have them.

                          Did you ever ask the shop techs to look at the tires you have? To measure them? Or did you hear the word "no" and just leave? Did they offer to help you confirm your tire size? Because if they held a 26" bike tire up to yours they would have seen that they were the same.

                          When you're dealing with people who don't know chairs you have to ask the right questions - good questions. You also have to be resourceful. Questions like "Well, what do you have?" and "What could you order?" and "Can you help me figure this out?" and "Can you confirm my tire size?" probably would have solved your problem immediately.

                          EVERYONE: this piece of equipment under our asses is our life. You HAVE to know everything about it: how to buy for it, how to fix it, how to size it. You have to ask good and educated questions. People who aren't in chairs will not know how to help you and will often assume they can't.

                          Originally posted by Mutley View Post
                          almost dropped au$500 on a pair of 26" bike rims thinking I'd always be able to get tyres and tubes for that size.
                          If you bought 26" bike rims for your chair you would be able to buy 26" bike tires and tubes. I'm not sure how it could be any more clear and simple than that...?

                          Originally posted by NW-Will View Post
                          24" wheel is 540
                          540, 520, 507, and 547 are all called 24". This is why ETRTO is so important!

                          Originally posted by Mutley View Post
                          Unfortunately the mountain bike tyres dont come in 1". They are usually well over 2". Not gonna fit on my rims

                          Schwalbe CX Pro comes in 35-559 (26 x 1.35")


                          These are true knobbies. Schwalbe also has a handful of narrower 559 tires that aren't knobby but have significant tread.

                          Originally posted by Mutley View Post
                          Australia doesnt use the ERTRO measurement system and websites with conversion tables confuse me no end... I found out that 26" tyres are hard to come by as well.
                          As Will said, ETRTO is worldwide. Most tire companies are in Europe and North America and use this system. If you go to a bike shop that doesn't know what ETRTO is, GO TO A DIFFERENT BIKE SHOP.

                          There are literally tons of 26" tires out there. There may not be many on wheelchair websites, but Go to any bike website and look for tires in the XX-559 size.

                          Originally posted by Mutley View Post
                          I've got 25 inch Marathon Plus Evolutions and they have no size on them. First tyre I've ever seen without a size on it. Mind you I haven't seen inside the tyre as it is on a rim...
                          It will not be on the inside of the tire. If your tires are old, the lettering may have worn off. But I assure you it was there when they were new.

                          Currently, Schwalbe only makes 540 and 559 sizes of wheelchair tires. NO ONE makes a size between 540 and 559. (the 547 size I mentioned earlier is an antiquated size and is not made anymore)

                          You have either a 24"/540 tire or a 26"/559 tire. I'm sorry you were confused by the whole 25" thing that wheelchair companies do. It's dumb and really unhelpful.

                          Comment


                            #14
                            Originally posted by Mutley View Post
                            Australia doesnt use the ERTRO measurement system and websites with conversion tables confuse me no end. Mainly because they're focused on bike sizes. I heard tho, that a 25" wheelchair tyre is actually a 26" bike tyre. I most definately might be wrong tho. I found out that 26" tyres are hard to come by as well.
                            I confirmed that 559or 25" in wheelchair is a 26 bicycle tyre. There are 100's if not 1000's of 26 " tyres, millions of bikes were made using 26" wheels. I work in the bike industry and know how many tyres have been shown to me to spec on bikes, a lot.

                            Australia definitely uses erto as bikes are imported from Asia but I think Velocity was an Australian rim maker and they used erto.

                            Comment


                              #15
                              I used to always have a local bike shop change my tires when needed, or replace inner tubes. I would order my tires from like, say Sportaid, and when they arrived a family member or friend would take my wheels and new tires to the bike shop. Bike shops do a much better job of making sure you have good rim strips under your inner tube to protect your tube from internal punctures. One flat tire I had was due to what a wheelchair shop did when they put on new tires. They used tape instead of a regular decent heavy duty rim strip. The bike shop found the tape no longer sticking to the rim and the nipples on the spokes had punctured my inner tube. People even if an insurance company will pay for your new tires, get your own and take your wheels to a bike shop.

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