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  1. #1
    Senior Member Fat Tire's Avatar
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    Tire width for 28mm wide rims?

    My bicycle has 559x28mm rims, and 1.95x 26" tires, from the factory. I want to install 2.35x26" tires on it. Would that be a wide enough rim? Or should I settle for 2.15x26"? Since the bike comes with coaster brakes on the rear, and roller brakes on the front, the tires will not affect anything except load bearing ability, and traction, not to mention ride comfort.

    There appears to be sufficient clearance front and rear, for wider tires.
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  2. #2
    Senior Member EKW in DC's Avatar
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    This may help...

    http://www.sheldonbrown.com/tire-sizing.html#width

    FYI, 25.4 mm = 1 inch.

  3. #3
    Senior Member Fat Tire's Avatar
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    His chart only shows up to 25mm, my rims are 28mm, but using my best guesstimation, I think I'll try them when the nubs wear off of the stock tires. These tires are not the widest I have seen by any means,( that would be a 24"x3" which rolls at 26", for chopper style cruisers on the rear). The tires are supposed to have very low rolling resistance. At 2 bars, they are supposed to have 11% lower rolling resistance than the comparison tires when aired up to 3 bars.

    Thanks for the link, and the reply.
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  4. #4
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by Fat Tire View Post
    My bicycle has 559x28mm rims, and 1.95x 26" tires, from the factory. I want to install 2.35x26" tires on it. Would that be a wide enough rim? Or should I settle for 2.15x26"? Since the bike comes with coaster brakes on the rear, and roller brakes on the front, the tires will not affect anything except load bearing ability, and traction, not to mention ride comfort.

    There appears to be sufficient clearance front and rear, for wider tires.
    You shouldn't have problems putting the widest tires you can find on a 28mm wide rim. Most of the really, really wide tires are going to be low pressure (60 psi max) so there should be a problem with them blowing off. Don't run them at 100 psi

    As an example, I run 2.125" and 2.3" tires on 19mm Mavic rims on 3 different mountain bikes. I run pressure of 55 psi in the front and 45 psi in the back. I've never had an issue with blowouts or the tire coming off the rim. On one of the bikes, I even run the pressure up to 60 psi when commuting.

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  5. #5
    Part-time epistemologist invisiblehand's Avatar
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    Quote Originally Posted by Fat Tire View Post
    His chart only shows up to 25mm, my rims are 28mm, but using my best guesstimation, I think I'll try them when the nubs wear off of the stock tires. These tires are not the widest I have seen by any means,( that would be a 24"x3" which rolls at 26", for chopper style cruisers on the rear). The tires are supposed to have very low rolling resistance. At 2 bars, they are supposed to have 11% lower rolling resistance than the comparison tires when aired up to 3 bars.

    Thanks for the link, and the reply.
    The interior width of your rims is 28 mm? That is pretty wide.

    Sheldon has a rule of thumb on the same page. From memory, I believe it is 1.4-2.0 times the interior width of the rim.

  6. #6
    Senior Member Fat Tire's Avatar
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    Quote Originally Posted by cyccommute View Post
    As an example, I run 2.125" and 2.3" tires on 19mm Mavic rims on 3 different mountain bikes. I run pressure of 55 psi in the front and 45 psi in the back. I've never had an issue with blowouts or the tire coming off the rim. On one of the bikes, I even run the pressure up to 60 psi when commuting.

    Go for a pair of Maxxis Hookworms
    I was planning on 2.35x26" Schwalbe Big Apples. They are supposed to be quite light, and low rolling resistance at lower pressures. I had looked at Big Bettys but the price settled that, I can get the Big Apples for well under $40 each(with reflective tire rings) and the Big Bettys are $80. The Fat Franks are similar to the Big Apples (same technology, same price), but come in Creme and Brown, as well as black.

    The Big Betty's are 2.4 Nominal/ 2.5 actual tread width. So you get more tire, but at double the price.
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  7. #7
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by Fat Tire View Post
    I was planning on 2.35x26" Schwalbe Big Apples. They are supposed to be quite light, and low rolling resistance at lower pressures. I had looked at Big Bettys but the price settled that, I can get the Big Apples for well under $40 each(with reflective tire rings) and the Big Bettys are $80. The Fat Franks are similar to the Big Apples (same technology, same price), but come in Creme and Brown, as well as black.

    The Big Betty's are 2.4 Nominal/ 2.5 actual tread width. So you get more tire, but at double the price.
    The recommendation for the Hookworms was a joke...not a recommendation You could easily go to a 2.5" tire with those rims without worries. The Big Apples won't have problems.
    Stuart Black
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    Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
    Days of Wineless Roads. Bed and Breakfasting along the KATY
    Twisting Down the Alley. Misadventures in tornado alley.
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