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Old 02-19-09, 01:40 PM   #1
pistolpedro
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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?
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Old 02-19-09, 01:59 PM   #2
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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...
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Old 02-19-09, 02:00 PM   #3
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700C is 622mm BSD (bead seat diameter). 700B is 635mm BSD. Completely different animals.
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Old 02-19-09, 07:14 PM   #4
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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.
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Old 02-22-09, 09:44 AM   #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
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Old 02-22-09, 10:08 AM   #6
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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.

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Old 02-22-09, 10:13 AM   #7
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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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