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Old 12-16-07, 09:52 PM   #1
phatatude
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fit a 20 x 1 1/8 rim to 20 x 1 3/8 tire?

Does anyone know if its possible to fit a 20 x 1 1/8 rim into a 20 1 3/8 tire? Im thinking it might be a per tire manufacturer deal since not all tires are created equal ?...

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Old 12-16-07, 09:59 PM   #2
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Does anyone know if its possible to fit a 20 x 1 1/8 rim into a 20 1 3/8 tire? Im thinking it might be a per tire manufacturer deal since not all tires are created equal ?...
You need to find out the ISO size of the rim and tire. A 20 1 3/8 tire is usually 349mm ISO. 20x1 1/8 is not a normal size (although J&B Distributors sometimes mislabels 1 3/8 as 1 1/8 for the Sun M14A rim).

Go by the ISO size, it is much safer.

http://www.sheldonbrown.com/tire_sizing.html

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Old 12-16-07, 10:14 PM   #3
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The rims I have are 20x1 1/8-451's... Most 451's are 20x1 1/8 and 20x1 3/8... I would just love to put a 20x1 3/8 on the 20x1 1/8 rim to give me a bit more suspension, and rim protection.

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Old 12-17-07, 07:20 AM   #4
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Any ISO 451 mm tire *should* fit on any ISO 451 rim. As we all know, of course, there are combinations of certain rims and tires that **should** fit together, but don't. Unless you have the bad fortune of hitting on one of those combinations, you ***should*** be okay.
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Old 12-17-07, 07:31 AM   #5
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I've had no problems with that combination but YMMV
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Old 12-17-07, 08:43 AM   #6
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Thanks a ton rhm. That information should expand my tire options a bit more. If anyone has had combinations that havent fit together please speak up to keep the rest of us from making the same mistakes.

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Old 12-17-07, 10:06 AM   #7
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Thanks a ton rhm. That information should expand my tire options a bit more. If anyone has had combinations that havent fit together please speak up to keep the rest of us from making the same mistakes. ...
Yeah, a database rating various rim-and-tire combinations would be really helpful, but man... what a lot of work that would be! Did you see this thread, it's to the point, though not entirely encouraging:
changing tires...near impossible
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Old 12-17-07, 11:32 AM   #8
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Those are great posts, on that link. A bit scary though sheesh. Sounds like a Crap shoot as far as what will work. I have never had problems with any tire mounting before so I guess I am going to have to be prepared for the worst.


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Old 12-17-07, 11:44 AM   #9
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Sorry about my misleading information, I was thinking about 16x1 3/8.

The part about going by ISO sizing is still correct.
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Old 12-17-07, 12:03 PM   #10
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It's all fun and games till someone gets hurt
Its ok awetmore, No harm no foul

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Old 12-17-07, 12:15 PM   #11
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... I have never had problems with any tire mounting before so I guess I am going to have to be prepared for the worst. ...
Well, yeah, but the thing is...there should be no problem, but you may be unaccountably unable to mount a certain tire on your rim. If this happens, don't fight it-- return the incompatible tire to the store that sold it, say "it doesn't fit," and let them deal with it. Don't waste your time trying to use a tire that doesn't fit.
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