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Thread: 23" Tires?

  1. #1
    Senior Member Scorpion's Avatar
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    23" Tires?

    Anybody know where I can get 23" wheelchair tires? I can't seem to find any online. I want to replace my Invacare Mariner shower chair's tires; I'd prefer pneumatic, which hold brakes better, and something that won't mark the floor and carpet, maybe grey rubber. The tires on there now are solid, but the rims are equipped for pneumatic as well.

  2. #2
    Senior Member IsMaisin's Avatar
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    I believe the 23" is a xx-489 in ETRTO. The only pneumatic tires I know of with that sizing are schwalbe rightruns, but they call them a 22".

    Look on the sidewall of your tire. There should be a number marking with the ETRTO size.

    ETRTO (European Tire and Rim Technical Organization): Standards organization for tire and rim sizes.

    Nowadays, bicycle tires sizes should all fall in line with ETRTO's (European Tire and Rim Technical Organization) tire and rim standards. Yet the older English and French tire size markings are still used.

    An ETRTO size marked 37-622 indicates the width of 37 mm and the tire inner diameter of 622 mm. This designation is clear and allows an unequivocal match with the corresponding rim size.

    NOTE: Always reference the ETRTO number when ordering to ensure accuracy in tire fit.

    Inch sizes are ambiguous and lack accuracy. For example, the diameters 559 mm (MTB), 571 mm (Triathlon) and 590 mm (Touring) are all designated 26 inch. Tires with diameters 622 mm and 635 mm are both designated 28-inch, yet, surprisingly, tires with a diameter of 630 mm are designated 27-inch.
    Played with bombs- No SCI, Brain Damage enough that I require a chair and a caregiver.

  3. #3
    Senior Member Scorpion's Avatar
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    Thanks for the tip! I'll check it out.

    I wouldn't even mind solid tires so much if they were grey like the old Invacare shower chairs used.

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