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Thread: What tires should I buy?

  1. #31
    Senior Member NW-Will's Avatar
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    Yes a chart with tyre size- brand - model - wheel width and tyre pressure with outside diameter would be useful and helpful for others. A real world outside diameter where individuals measure the outside diameter of course.

    It took some experimentation for me to realize my goal. I have to admit I reached the point where I didn't think I was going to pull it off.
    The 25" 559 is the best option in my opinion because of the greater tyre selection, you can experiment and achieve the goal of the right outside diameter.
    I'm sold on the 27" 622 for the regular 1"(25mm) non- marking wheels.. outside diameter 26 7/8"


    Quote Originally Posted by robotnik View Post
    I tried also to swap between urban and offroad wheels... but without your success NW-Will !
    It's very difficult to have an idea of the outside diameter of the rig, before having it all installed and ready to go. And this diameter is all we need to know, rim size isn't an issue (or eventually for the pushrim size)
    First of all I was rolling with a very common rig : 24" Spinergy with 1" Marathon.
    Then I bought a pair of 24" MTB (507mm) and I choose 1.75" Marathon to improve comfort and gentle offroad use.
    When I tried to swap, I realized the external diameter was not the same, and even if the changes were barely noticeable on the chair's balance, the brakes were lost. The 1.75" Marathons were a bit smaller than the 1" ones.
    Keeping the same 507 rims, I bought pretty big 2.35 Schwalbe "Crazy Bob". And now I can say they are ... very tall ! I had to change the settings of my ZX-1 from 24" clamshell position to 25". So with this set, there's no way to come back ! Unless buying 25" (559mm) rims... and 1" tire may be ?
    In fact, we should make a scale of exterior diameter according to the rim/tire used... I think it could help !

  2. #32
    Senior Member NW-Will's Avatar
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    I'm just throwing this out there on this thread, not meaning to hijack.

    I have some 590 (26") wheels currently shod in 42-590 HS 349 Schwalbes that give me the outside diameter of 26.5" I was having the crazy shower thought of; it would be really good if I could fit a tire to these wheels which would give me an outside diameter of just under 27" really 26 7/8" . this is my sweet spot size whether I am running 27" 26" or 25" wheel rims with the right tires I'll always have an outside tire diameter of 26 7/8" and then I can trade any wheel tire combination to my chair without having to make any adjustments to my chair.

    Trying to find a larger 590 tire with no luck 42-590 seems to be the largest size.

    Then I noticed there is a 584 size the French 650B. apparently a popular french wheel size.
    The 650B seems to have a nice selection of tires.. just from the Schwalbe tire website there are.
    25 - 584
    28
    - 584
    35
    - 584
    37
    - 584
    40
    - 584
    42
    - 584
    44
    - 584
    47
    - 584
    50
    - 584
    54
    - 584
    57
    - 584
    60
    - 584
    62
    - 584
    64
    - 584
    65
    - 584
    70
    - 584
    75 - 584

    The big money question!! what is 6mm(15/64") between friends and a tire and a wheel!
    As in what are my chance of pulling a 584 tire on to 590 rim ... if this proves to be possible, then the selection of tire for the wheel chair 26" wheels has just exploded.
    Any one happen to try this ?
    Seriously thinking of calling some tire shops up around town and see if they have any 650B's in stock and see if I can get them to fit my 590 rim before I part with any cash

    mmmmmmmhhhhh
    http://www.bikeforums.net/bicycle-me...x-1-3-8-a.html


    Last edited by NW-Will; 06-10-2017 at 01:24 AM.

  3. #33
    Senior Member robotnik's Avatar
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    Quote Originally Posted by NW-Will View Post
    Then I noticed there is a 584 size the French 650B. apparently a popular french wheel size.
    yes for sure ! 584mm is one of the oldest size of rims. And now, you can find it on the new mainstream of MTB, called 27.5.
    So you have the choice from the vintage style, white sidewalls old fashioned Netherland's bike tire to aggressive top of the race knobbies, including slick or semislick roadrunner's . This his HUGE, may be largest choice than 559' !!
    Quote Originally Posted by NW-Will View Post
    what is 6mm(15/64") between friends and a tire and a wheel!
    As in what are my chance of pulling a 584 tire on to 590 rim ... if this proves to be possible, then the selection of tire for the wheel chair 26" wheels has just exploded
    It could be great of course? but your chances to achieve that are very narrow ! 6mm in diameter looks like a very small diff, but if you calculate the circumference, you'll find 1834mm for the 650B and 1852mm for the 26" -590mm-, and the difference (approx 4/5" ?) is IMHO too big if your tire is iron or Kevlar wired. And they are, most of the time !

    PS: have a look at this, if it can help (in French, sorry !)
    http://wiklou.org/wiki/ETRTO_(ISO_5775)
    Last edited by robotnik; 06-10-2017 at 07:06 AM.
    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.

  4. #34
    Senior Member NW-Will's Avatar
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    I'll try and find a tire during the week and give it my best shot, that would be so cool if I could shoe horn a 584 on to a 590.
    590 comes out closer to 1853.5 I know a whole millimeter , but of course in the wrong direction so 19mm 3/4" ... of course we're not looking for high performance so maybe the bead not seating correctly will be ok, but then don't want a bump in the tire either! searching the bike forums it seems like other people have thought of this, but no definitive answer as to whether anyone was successful. I'll be aiming at more of a balloon tire so hopefully that'll work in my favour.

  5. #35
    Senior Member NW-Will's Avatar
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    HA!
    So I bought some 50-584's (Schwalbe Marathon Mondial DD 27.5" (650B) 27.5x2.00 - Evo Double Defense Folding)
    Because they had them in the store and I could try them.
    The tread is a little more aggressive than I would have liked, but I could fit them in the store before I bought them.
    Definitely need tire levers to get them on, but not too difficult.
    They don't seat perfectly, but after rolling around on them and trying my hardest to notice, they seem just fine.
    I over inflated them to try and make them seat a little better, which helped, just cosmetic from my point of view.
    They come in right around 27" outside diameter about a 1/16" bigger than I would like, but that is over inflated 90psi
    The inflation range is 35-70psi, at around 40psi they fit perfectly with no adjustments to my chair, and I'm rolling around on them.
    So I now have 3 sets of rims 25",26" and 27" all shod with tires that have an outside diameter of 26 7/8", pretty much
    If I did it again I think I would try the 47-584 (27.5 x 1.75 Inch) tires.

    Here are some pictures.. The cardboard shim(you can barely see it) is 1/16" thick
    the 590 26" wheels are shown with the 42-590 tires as well as the 50-584, a good 0.5" difference in outside diameter.

    26" wheel with 42-590 marathon plus, you can see the better bead fit by following the fluorescent strip.


    26" wheel with 50-584 just make out the tire is not seating well.



    One 26" wheel with a 50-584 and one 26" wheel with a 42-590 on the same axle, that is a good 0.5" gap.


    Two 27" wheels with non-marking 27x1 tires and one 26" wheel with the 50-584 tire. the 27" tires are barely touching the floor, the 50-584 is over inflated.



    Two 26" wheels with 584-50 tires and two 25" wheels with 60-559, again the cardboard is 1/16" thick, all on the same axle.



    Finally all six wheels on the same axle, cardboard under the 27" and 25" wheel.

  6. #36
    Senior Member robotnik's Avatar
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    Whaaaa ... Nice, very nice...
    So with a 590 rim, you can access to the 650B tires choice ? That's HUGE !
    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.

  7. #37
    Senior Member NW-Will's Avatar
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    So yes, but just with the one caveat, the tires may not seat perfectly, seems just cosmetic to me.
    That said for the smaller sizes 590 has you covered.
    590 available sizes
    20-590
    25-590
    28/32-590
    37-590
    42-590
    Then yes 584 after that all the way to 75-584
    Plus I think with the larger sizes the seating issue will be even less noticeable.
    Nice to able to put my 26" wheels to use again though.


    Quote Originally Posted by robotnik View Post
    Whaaaa ... Nice, very nice...
    So with a 590 rim, you can access to the 650B tires choice ? That's HUGE !

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