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  1. #1
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    Tyre problems: 700 35C / 700 38 B

    Hi Guys

    New tyres arrived today,

    Currently: Schwalbe 700 38B

    New tyre: Dutch perfect 700 35C

    Tried to fit the new tyre tonight and it wouldnt go on, new ones seem much to small (diameter) are these sizes compatible?

  2. #2
    Luddite
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    I'm sorry to inform you that your new tire won't fit. 700B is 635 mm bead seat diameter and 700C is 622 mm. Here's what Saint Sheldon says about it:

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

    You may be able to wedge on a 27 inch tire (630 mm), but I would be scared about the consequences of the wrong BSD...

  3. #3
    Senior Member demoncyclist's Avatar
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    700C is 622mm BSD (bead seat diameter). 700B is 635mm BSD. Completely different animals.
    DEMON

    Satanic Mechanic
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    2011 Lynskey Sportive (Shimano Ultegra 10s)
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  4. #4
    Gear Hub fan
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    Schwalbe USA lists 3 tires in 635mm BSD on their web site per the check I just made. A rare size here but originally used on English roadster utility bikes and it may still be used in India and China on some bikes.
    Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro

    Visit and join the Yahoo Geared Hub Bikes group for support and links.
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  5. #5
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    Thanks guys, going to ring the supplier in the morning and see if i can exchange them for the correct size

  6. #6
    surly old man jgedwa's Avatar
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    Quote Originally Posted by Squeazel View Post

    You may be able to wedge on a 27 inch tire (630 mm), but I would be scared about the consequences of the wrong BSD...
    Are you sure this has any chance of working? I have always worked under the assumption that there was NO room to fudge bead size on a tire. I am tempted to declare this advice (even in the cautious form you gave it) bogus, but I will have to admit I have never actually tested this particular permutation of it.

    Failing someone saying that it does stand a chance of working, I have to disagree firmly on it.

    jim
    Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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    SB forever

  7. #7
    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by jgedwa View Post
    Are you sure this has any chance of working? I have always worked under the assumption that there was NO room to fudge bead size on a tire. I am tempted to declare this advice (even in the cautious form you gave it) bogus, but I will have to admit I have never actually tested this particular permutation of it.

    Failing someone saying that it does stand a chance of working, I have to disagree firmly on it.

    jim
    I would have said the same thing, but way less tactfully.

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