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Thread: Anybody rolling 27" wheels or anything larger than 26" ??? a small favor

  1. #1
    Senior Member NW-Will's Avatar
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    Anybody rolling 27" wheels or anything larger than 26" ??? a small favor

    Hi looking for someone who rolls 27" wheels and/or larger wheels on their chair.

    What kind of hand rims do you have ?

    What tires are you using ? manufacturer/model ? non-marking ? or regular bicycle tires ?

    Tire size ? ETRTO designation?

    The Favor : would your measure the distance from the floor to the top of the tire to get the real world diameter of the wheel&tire.

    I've rolled on standard 26" (590-25) wheels & 25" (559-25).

    Not sure what the 27" wheel chair wheels really are.
    From : http://www.sheldonbrown.com/rim-sizing.html

    590 - 26 x 1 3/8 (E.A.3), 650 A
    597 - 26 x 1 1/4 EA.1, 26 x 1 3/8 (S-6), 650
    599 - 26 x 1.25, x 1.375
    622 - 700 C, 28 x 1 5/8, 29 inch
    630 - 27
    635 - 28 x 1 1/2, 700 B


    Yet from : http://www.1800wheelchair.com/produc...kwall-100-psi/


    Pneumatic Wheelchair Tire (27" x 1") ~ Lt Grey/Blackwall, 100 PSI -
    Fits Most 27" x 1" (700x28C) (622mm x 28mm)




    Thank you.
    Last edited by NW-Will; 01-10-2017 at 08:02 PM.

  2. #2
    Sounds like you are looking for some 700c's ? My wheels right now are Sun with kenda nevegals on them for the winter and maxiss smoother tread the rest of the time. I have a set of 26" skinny tire wheels...but don't like them.

  3. #3
    Senior Member tooley's Avatar
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    without knowing your reasoning (or for the specific application you want to use the wheels/chair for) consider the length you will be adding to your chair.

    I know guys who run 26" (590) wheels who don't have near the turning radius of a chair with 25". They are constantly backing into stuff, I can't imagine what 700's would be like - THEY ARE HUGE! I'm willing to wager bathrooms you are accustomed to would feel a lot smaller.

  4. #4
    Quote Originally Posted by tooley View Post
    without knowing your reasoning (or for the specific application you want to use the wheels/chair for) consider the length you will be adding to your chair.

    I know guys who run 26" (590) wheels who don't have near the turning radius of a chair with 25". They are constantly backing into stuff, I can't imagine what 700's would be like - THEY ARE HUGE! I'm willing to wager bathrooms you are accustomed to would feel a lot smaller.
    559 with 2.10 or 2.50 is taller than a 26. What i really want is a set of 700c's to replace my 26" for high pressure skinny tires. Not everyone likes short wheels, i hate 24's.

  5. #5
    Senior Member NW-Will's Avatar
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    Yeah I'm trying to do similar.

    Quote Originally Posted by giles88 View Post
    559 with 2.10 or 2.50 is taller than a 26. What i really want is a set of 700c's to replace my 26" for high pressure skinny tires. Not everyone likes short wheels, i hate 24's.

  6. #6
    Senior Member NW-Will's Avatar
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    I'm trying to come up with a tire wheel combination so when I come in the house I can just swap wheels and keep the same geometry/cog/(no brake) adjustment etc.

    I'll be running 25" 559 wheels outside with larger tires.
    I'm currently using:
    25"*1" rims with a tire - 60-559 (26*2.35) 30-55psi Big Apple Schwalbe: which give an actual measured outside diameter @55psi of 26 7/8".

    on my other chair I'm running :
    26"*1" rims with a tire - 42-590 HS 349 Schwalbe :which give an actual measured outside diameter @maxpsi of 26 1/2".

    So a 26" (590) wheel is already too small...

    I would like to know what is the most common wheelchair (non-marking) wheel/tire size greater than 26" that anyone is running....... and hence can measure for me.. before I splash out any cash on this experiment.

    Must be some larger folks out there.

    the 622 - 700 C seems the most likely, but what do folks do for push rims ?


    cheers.

  7. #7
    Senior Member brian's Avatar
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    find the ETRTO size here (or any other circumference list):
    https://www.cateye.com/data/resource..._chart_ENG.pdf
    There should be a few of these out there because back in ye olde days before GPS we had to use them to program cycle computers.

    Then plug in the circumference into any circle calculator like this one:
    http://www.onlineconversion.com/circlesolve.htm

    And there you'll find all the diameters you'll need!

    See my post about handrims here:
    http://sci.rutgers.edu/forum/showthr...68#post1815568

  8. #8
    These guys make very nice chairs that they offer with 26" or 28" wheels as standard: http://www.carbonblacksystem.com/design
    I have heard good things about the 28" wheels but have never used them.

  9. #9
    Senior Member NW-Will's Avatar
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    Yeah great info.
    I'm just after a real world measurement, from folks who roll on wheels larger than the standard 26" (590)

    If you've ever compared two tires from different manufacturers same size. you'll easily get 1/8" -1/4" difference in the final diameter.

    Plus I am taking tires which are meant for wider rims and putting them on 1" regular wheelchair rims so that in itself again throws out the measurement by a factor enough to take perfectly balanced chair to completely tippy unusable without adjustment.

    As an example I'm running 26*2.35 which schwalbe calls (60-559) other manufacturers call them (58-559) ... the catseye chart gives me a circumference of 2083mm, a diameter of 663mm
    26 1/8" Where the actual real world measurement gives me 26 7/8"

    1/2" is too great a difference for my brakes to function with no adjustment.

    Quote Originally Posted by brian View Post
    find the ETRTO size here (or any other circumference list):
    https://www.cateye.com/data/resource..._chart_ENG.pdf
    There should be a few of these out there because back in ye olde days before GPS we had to use them to program cycle computers.

    Then plug in the circumference into any circle calculator like this one:
    http://www.onlineconversion.com/circlesolve.htm

    And there you'll find all the diameters you'll need!

    See my post about handrims here:
    http://sci.rutgers.edu/forum/showthr...68#post1815568

  10. #10
    Senior Member NW-Will's Avatar
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    Looking like 700C is the standard wheelchair size ETRTO 622, some folks call em 27" some call em 28"

    Using Brians charts with 27" x 1" or 28"x 1" (700x28C) (622mm x 28mm) . circumference= 2138mm : diameter = 680.5mm
    26 13/16" so theoretically close enough to my 26 7/8" with 60-559 (26*2.35) tires I'm currently using.

    Carbon Black wheels support only tubular tyres of the size appropriate to your wheels size (26 or 28” [700c]).
    - from the carbon black website.

    Quote Originally Posted by Adrian View Post
    These guys make very nice chairs that they offer with 26" or 28" wheels as standard: http://www.carbonblacksystem.com/design
    I have heard good things about the 28" wheels but have never used them.

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