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Bike tire size question

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Cycling Equipment
Published
3 June 2008
Last activity
4 June 2008
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Twitchell
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  1. I'm ordering some tires for a bike but some of the sizes are in fractions (1
    3/4) and others are in decimal (1.75)

    Is there a difference?

    The rim is 26 x 1" (outside diameter) and have been told here that it will take
    a 1.75" width tire. It currently has a tire that says 26 X 1.50

    thanks

    twitch

  2. Twitchell said:

    I'm ordering some tires for a bike but some of the sizes are in fractions (1
    3/4) and others are in decimal (1.75)
    Is there a difference?  

    YES!

    See:
    http://sheldonbrown.com/tire-sizing.html

    Art Harris

  3. Twitchell said:

    I'm ordering some tires for a bike but some of the sizes are in fractions (1
    3/4) and others are in decimal (1.75)

    Is there a difference?

    The rim is 26 x 1" (outside diameter) and have been told here that it will take
    a 1.75" width tire. It currently has a tire that says 26 X 1.50

    Yes. Tire sizing traditionally has been a nightmare. Back in the 70s an
    ISO standard for designating tire sizes was implemented; it will be
    a pair of numbers like "28-622" where the first number indicates the
    nominal width and the second the bead seat diameter. See if you can
    find the ISO numbers on your tire (they're often molded into the
    sidewall) and use that to find a compatible tire.

    --

    John ([email hidden])

  4. On 3 Jun 2008 13:51:59 -0700, Twitchell <[email hidden]>

    may have said:

    I'm ordering some tires for a bike but some of the sizes are in fractions (1
    3/4) and others are in decimal (1.75)

    Is there a difference?

    There sure is!

    Quoted message said:

    The rim is 26 x 1" (outside diameter) and have been told here that it will take
    a 1.75" width tire. It currently has a tire that says 26 X 1.50

    A 1" wide rim (outside measure) of typical designs will easily support
    anything from 1.50 to 2.00" sectional size. It is not unusual to see
    tires beyond that range installed on such a rim, and it usually works
    well enough for the average rider to have no problems.

    For more extensive info on bike tire sizes, see
    http://www.sheldonbrown.com/tire-sizing.html

    --
    My email address is antispammed; pull WEEDS if replying via e-mail.
    Typoes are not a bug, they're a feature.
    Words processed in a facility that contains nuts.

  5. In article <[email hidden]>, Werehatrack says...

    Quoted message said:


    On 3 Jun 2008 13:51:59 -0700, Twitchell <[email hidden]>

    may have said:

    I'm ordering some tires for a bike but some of the sizes are in fractions (1
    3/4) and others are in decimal (1.75)

    Is there a difference?

    There sure is!

    Quoted message said:

    The rim is 26 x 1" (outside diameter) and have been told here that it will take
    a 1.75" width tire. It currently has a tire that says 26 X 1.50

    A 1" wide rim (outside measure) of typical designs will easily support
    anything from 1.50 to 2.00" sectional size. It is not unusual to see
    tires beyond that range installed on such a rim, and it usually works
    well enough for the average rider to have no problems.

    For more extensive info on bike tire sizes, see
    http://www.sheldonbrown.com/tire-sizing.html

    Both of you....

    Would I be safe in ordering:

    Cheng Shin C1027 Raised Center Tire 26 x 1.95" Wire Bead BSW

    http://www.amazon.com/Cheng-Shin-C1027-Raised-Center/dp/B000C15KE8/ref=sr_1_64?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-64

    or

    Cheng Shin C215 Street Tire 26 x 1-3/4" Wire Bead BW

    http://www.amazon.com/Cheng-Shin-C215-Street-Tire/dp/B000C15NOU/ref=sr_1_71?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-71

    or maybe even

    26x2.125, Raised Center, Black, 40psi, Tire

    http://www.amazon.com/26x2-125-Raised-Center-Black-40psi/dp/B000WYAE0A/ref=sr_1_138?ie=UTF8&s=sporting-goods&qid=1212533152&sr=1-138

    Do inner tubes come in sizes like tires or is it one size fits all? I should
    get a couple of them for the tires. I'm going to buy two tires.

    twitch

  6. "Twitchell" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In article <[email hidden]>, Werehatrack
    says...

    Quoted message said:

    Would I be safe in ordering:

    Cheng Shin C1027 Raised Center Tire 26 x 1.95" Wire Bead BSW

    http://www.amazon.com/Cheng-Shin-C1027-Raised-Center/dp/B000C15KE8/ref=sr_1_64?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-64

    Do inner tubes come in sizes like tires or is it one size fits all? I
    should
    get a couple of them for the tires. I'm going to buy two tires.

    Unless you are riding your bike off-road in rather heavy terrain I would
    suggest you use a 26 x 1.25" such as
    http://www.nashbar.com/profile.cfm?category=6000121&subcategory=60001249&brand=&sku=7174&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%2026x1%2E0%20to%2026x1%2E75

    Yes, inner tubes come in sizes as well but they're pretty general. Remember
    that there are a couple of different filler types and you have to buy the
    proper type for your rims. The pictures of your bike appear that you use a
    Schrader Filler and so a tube for that could be:

    http://www.nashbar.com/profile.cfm?category=600097&subcategory=60001116&brand=&sku=4850&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%20Tubes

  7. In article <[email hidden]>, Tom Kunich says...

    Quoted message said:


    "Twitchell" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In article <[email hidden]>, Werehatrack
    says...

    Quoted message said:

    Would I be safe in ordering:

    Cheng Shin C1027 Raised Center Tire 26 x 1.95" Wire Bead BSW

    http://www.amazon.com/Cheng-Shin-C1027-Raised-Center/dp/B000C15KE8/ref=sr_1_64?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-64

    Do inner tubes come in sizes like tires or is it one size fits all? I
    should
    get a couple of them for the tires. I'm going to buy two tires.

    Unless you are riding your bike off-road in rather heavy terrain I would
    suggest you use a 26 x 1.25" such as
    http://www.nashbar.com/profile.cfm?category=6000121&subcategory=60001249&brand=&sku=7174&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%2026x1%2E0%20to%2026x1%2E75

    Sheesh...that's almost BALD. Prolly good for you and your rides but I do want
    some tread. It seems like a good idea to have matching sizes, front and rear
    which is why I want 1.75 or 1.95 I like the tube though.

    Quoted message said:

    Yes, inner tubes come in sizes as well but they're pretty general. Remember
    that there are a couple of different filler types and you have to buy the
    proper type for your rims. The pictures of your bike appear that you use a
    Schrader Filler and so a tube for that could be:

    http://www.nashbar.com/profile.cfm?category=600097&subcategory=60001116&brand=&sku=4850&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%20Tubes

  8. Twitchell said:

    In article <[email hidden]>, Tom Kunich says...

    Quoted message said:

    "Twitchell" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In article <[email hidden]>, Werehatrack
    says...
    Would I be safe in ordering:

    Cheng Shin C1027 Raised Center Tire 26 x 1.95" Wire Bead BSW

    http://www.amazon.com/Cheng-Shin-C1027-Raised-Center/dp/B000C15KE8/ref=sr_1_64?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-64

    Do inner tubes come in sizes like tires or is it one size fits all? I
    should
    get a couple of them for the tires. I'm going to buy two tires.


    Unless you are riding your bike off-road in rather heavy terrain I would
    suggest you use a 26 x 1.25" such as
    http://www.nashbar.com/profile.cfm?category=6000121&subcategory=60001249&brand=&sku=7174&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%2026x1%2E0%20to%2026x1%2E75

    Sheesh...that's almost BALD. Prolly good for you and your rides but I do want
    some tread. It seems like a good idea to have matching sizes, front and rear
    which is why I want 1.75 or 1.95 I like the tube though.

    Tread serves no purpose for bicycle tires used on pavement. Really.
    You'll get better grip, especially in the wet, with a smooth tire.

    If you'll be riding in gravel, dirt, etc., then go ahead and get some tread.

    Mark J.

  9. "Twitchell" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In article <[email hidden]>, Tom Kunich
    says...

    Quoted message said:


    Unless you are riding your bike off-road in rather heavy terrain I would
    suggest you use a 26 x 1.25" such as
    http://www.nashbar.com/profile.cfm?category=6000121&subcategory=60001249&brand=&sku=7174&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%2026x1%2E0%20to%2026x1%2E75

    Sheesh...that's almost BALD. Prolly good for you and your rides but I do
    want
    some tread. It seems like a good idea to have matching sizes, front and
    rear
    which is why I want 1.75 or 1.95 I like the tube though.

    That raised tread on off-road tires gives you MUCH poorer traction on
    asphalt. Also you do not require a very wide tire. Remember that on my
    street bike I'm running a 23 mm wide tire - that's about 7/8" and it is more
    than enough.

  10. In article <[email hidden]>,

    John Thompson said:
    Twitchell said:

    I'm ordering some tires for a bike but some of the sizes are in
    fractions (1 3/4) and others are in decimal (1.75)

    Is there a difference?

    The rim is 26 x 1" (outside diameter) and have been told here that
    it will take a 1.75" width tire. It currently has a tire that says
    26 X 1.50

    Yes. Tire sizing traditionally has been a nightmare. Back in the 70s
    an ISO standard for designating tire sizes was implemented; it will
    be a pair of numbers like "28-622" where the first number indicates
    the nominal width and the second the bead seat diameter. See if you
    can find the ISO numbers on your tire (they're often molded into the
    sidewall) and use that to find a compatible tire.

    Good advice. ISO numbers simplify things quite a bit. Sheldon Brown's
    article on tire sizes, previously referenced by others, sorts out the
    nightmare pretty well and lets people figure out what the tire sizes of
    old British bikes were when buying new tires. Them old dried out tires
    usually don't have ISO numbers.

  11. In article <[email hidden]>,

    Twitchell said:

    In article <[email hidden]>, Tom Kunich says...

    Quoted message said:


    "Twitchell" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In article <[email hidden]>, Werehatrack
    says...
    >

    Would I be safe in ordering:

    Cheng Shin C1027 Raised Center Tire 26 x 1.95" Wire Bead BSW

    http://www.amazon.com/Cheng-Shin-C1027-Raised-Center/dp/B000C15KE8/ref=sr_1_64?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-64

    Do inner tubes come in sizes like tires or is it one size fits all? I
    should
    get a couple of them for the tires. I'm going to buy two tires.

    Unless you are riding your bike off-road in rather heavy terrain I would
    suggest you use a 26 x 1.25" such as
    http://www.nashbar.com/profile.cfm?category=6000121&subcategory=60001249&brand=&sku=7174&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%2026x1%2E0%20to%2026x1%2E75

    Sheesh...that's almost BALD. Prolly good for you and your rides but I do want
    some tread. It seems like a good idea to have matching sizes, front and rear
    which is why I want 1.75 or 1.95 I like the tube though.

    On pavement: bald-good; pattern-bad.
    Even on mild off road stuff such as packed gravel or dirt bald is no impediment.

    --
    Michael Press

  12. In article <[email hidden]>, Michael Press
    says...

    Quoted message said:


    In article <[email hidden]>,

    Twitchell said:

    In article <[email hidden]>, Tom Kunich says...

    Quoted message said:


    "Twitchell" <[email hidden]> wrote in message
    news:[email hidden]...
    > In article <[email hidden]>, Werehatrack
    > says...
    >>
    >
    > Would I be safe in ordering:
    >
    > Cheng Shin C1027 Raised Center Tire 26 x 1.95" Wire Bead BSW
    >
    >http://www.amazon.com/Cheng-Shin-C1027-Raised-Center/dp/B000C15KE8/ref=sr_1_64?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-64
    >
    > Do inner tubes come in sizes like tires or is it one size fits all? I
    > should
    > get a couple of them for the tires. I'm going to buy two tires.

    Unless you are riding your bike off-road in rather heavy terrain I would
    suggest you use a 26 x 1.25" such as
    http://www.nashbar.com/profile.cfm?category=6000121&subcategory=60001249&brand=&sku=7174&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%2026x1%2E0%20to%2026x1%2E75

    Sheesh...that's almost BALD. Prolly good for you and your rides but I do want
    some tread. It seems like a good idea to have matching sizes, front and rear
    which is why I want 1.75 or 1.95 I like the tube though.

    On pavement: bald-good; pattern-bad.
    Even on mild off road stuff such as packed gravel or dirt bald is no impediment.

    Well, for better or worse, I ordered two tires....both Cheng Shin cheapos...

    Sold by: Niagara Cycle Works1 "Cheng Shin C783 City Tire 26 x 1.50 Wire BW"
    Misc.; $6.78

    and

    1 "Cheng Shin C215 Street Tire 26%1A x 1-3/4" Wire Bead BW"
    Misc.; $6.36

    I also ordered two tubes...

    2 "Standard Tube (Schrader Valve) -26 x 1.5 - 2.2"
    Misc.; $4.99

    My challenge now is to do the replacements myself. Doesn't look too
    complicated.

    twitch

  13. On 3 Jun 2008 15:51:08 -0700, Twitchell <[email hidden]>

    may have said:

    In article <[email hidden]>, Werehatrack says...

    Quoted message said:


    On 3 Jun 2008 13:51:59 -0700, Twitchell <[email hidden]>

    may have said:

    I'm ordering some tires for a bike but some of the sizes are in fractions (1
    3/4) and others are in decimal (1.75)

    Is there a difference?

    There sure is!

    Quoted message said:

    The rim is 26 x 1" (outside diameter) and have been told here that it will take
    a 1.75" width tire. It currently has a tire that says 26 X 1.50

    A 1" wide rim (outside measure) of typical designs will easily support
    anything from 1.50 to 2.00" sectional size. It is not unusual to see
    tires beyond that range installed on such a rim, and it usually works
    well enough for the average rider to have no problems.

    For more extensive info on bike tire sizes, see
    http://www.sheldonbrown.com/tire-sizing.html

    Both of you....

    Would I be safe in ordering:

    Cheng Shin C1027 Raised Center Tire 26 x 1.95" Wire Bead BSW

    http://www.amazon.com/Cheng-Shin-C1027-Raised-Center/dp/B000C15KE8/ref=sr_1_64?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-64

    Safe, yes. Advisable; not so much. There's way more tread knobbiness
    on there than you need, and it's probably going to buzz a bit.

    Quoted message said:

    or

    Cheng Shin C215 Street Tire 26 x 1-3/4" Wire Bead BW

    http://www.amazon.com/Cheng-Shin-C215-Street-Tire/dp/B000C15NOU/ref=sr_1_71?ie=UTF8&s=sporting-goods&qid=1212532851&sr=1-71

    Will Not Fit! This tire is made for a different diameter of rim than
    what you have. Note that in the extended information one says 559 and
    the other says 571; those two numbers are the rim diameter in
    millimeters. It has to match the rim diameter of your bike or the
    tire will not fit. Since we already know that your bike has
    decimal-size tires now, we also know that it has 559 wheels; no
    question of it being anything else.

    Quoted message said:

    or maybe even

    26x2.125, Raised Center, Black, 40psi, Tire

    http://www.amazon.com/26x2-125-Raised-Center-Black-40psi/dp/B000WYAE0A/ref=sr_1_138?ie=UTF8&s=sporting-goods&qid=1212533152&sr=1-138

    Better than the first, but not what I'd buy myself, which is this:

    http://www.amazon.com/Tire-Pyramid-26X1-50-Black-Slick/dp/B000AO9ZJS/ref=sr_1_1?ie=UTF8&s=sporting-goods&qid=1212552465&sr=1-1

    Alternate link:

    http://tinyurl.com/5mnb34

    That's a 26 x 1.50 city slick tire which I've had good results with.

    Quoted message said:

    Do inner tubes come in sizes like tires or is it one size fits all?

    They are specific to an extent, but when you have two sizes to choose
    from with close or overlapping specs, pick the one that has the larger
    high-end to its range of appropriate sizes. For instance, with a
    26x1.50 tire, if the choices available are 26x1.0-1.75 and
    26x1.5-2.25, you are generally better off with the 26x1.5-2.25.
    Remember: fractional and decimal tire sizes are DIFFERENT, they are
    used on wheels that have a different diameter, and they don't
    interchange AT ALL. 26x1.5 is NOT the same as 26x1 1/2. In math,
    they would be; this isn't math.

    One other thing: there are two types of valve used on bike tubes;
    Presta and Schrader. Schrader valves are what you are used to; they
    work like the valves on a car wheel. Presta valves are different;
    they are skinnier, and they have a locknut on the end of the valve
    core (which sticks out of the end of the valve). UInless the bike you
    have is already equipped with prestas, or you like having to fiddle
    with extra steps when airing up a tire, stick with Schrader-valve
    tubes. Most non-bike-shop sources will generally not have
    Presta-valve tubes, but Amazon's marketplace suppliers have both.

    Quoted message said:

    I should
    get a couple of them for the tires. I'm going to buy two tires.

    Sounds like a plan.

    --
    My email address is antispammed; pull WEEDS if replying via e-mail.
    Typoes are not a bug, they're a feature.
    Words processed in a facility that contains nuts.

  14. Twitchellwrote:

    Quoted message said:


    Well, for better or worse, I ordered two tires....both Cheng Shin cheapos...

    Sold by: Niagara Cycle Works

    1 "Cheng Shin C783 City Tire 26 x 1.50 Wire BW"
    Misc.; $6.78

    OK. This will work with your 559 mm bead seat diameter rims.

    Quoted message said:

    and
    1 "Cheng Shin C215 Street Tire 26%1A x 1-3/4" Wire Bead BW"
    Misc.; $6.36

    This is not going to work. As we explained to you, fractional sizes
    (e.g., 26 x 1-3/4"😉 use a different rim diameter that decimal sizes.

    Your bike has rims with 559 mm bead seat diameter. The 26 x 1-3/4"
    tire you ordered needs a rim with a 571 mm bead seat diameter.

    The Niagara web site states: *Note: This is NOT the same diameter as a
    decimal tire size, such as 26" x 1.75"*

    Art Harris

  15. In article <[email hidden]>,
    Art Harris says...

    Quoted message said:


    Twitchellwrote:

    Quoted message said:


    Well, for better or worse, I ordered two tires....both Cheng Shin cheapos...

    Sold by: Niagara Cycle Works

    1 "Cheng Shin C783 City Tire 26 x 1.50 Wire BW"
    Misc.; $6.78

    OK. This will work with your 559 mm bead seat diameter rims.

    Quoted message said:

    and
    1 "Cheng Shin C215 Street Tire 26%1A x 1-3/4" Wire Bead BW"
    Misc.; $6.36

    This is not going to work. As we explained to you, fractional sizes
    (e.g., 26 x 1-3/4"😉 use a different rim diameter that decimal sizes.

    Your bike has rims with 559 mm bead seat diameter. The 26 x 1-3/4"
    tire you ordered needs a rim with a 571 mm bead seat diameter.

    The Niagara web site states: *Note: This is NOT the same diameter as a
    decimal tire size, such as 26" x 1.75"*

    Art Harris

    I ordered thru Amazon...they didn't give any warning. Anyway, it's on it's way
    and since it's only $6.36, I'm not being killed.

    Any advise on my front forks? They're 1994 Manitou Eastons. Thom sent me a
    manual in PDF format. I couldn't tell by looking but apparently, they move up
    and down and the manual says they should be taken apart and reoiled EVERY THREE
    MONTHS....you can't be serious.

    .....so I looked at the manual to see how to do it. Seems like a lot of work
    just for some bike forks and to do it every three months seems excessive.

    twitch

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