Admitting my ignorance... Tube question - Kawasaki KLR 650 Forum
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post #1 of 12 Old 05-20-2012, 03:33 PM Thread Starter
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Admitting my ignorance... Tube question

So maybe it's my unusually thick skull, but I'm having difficulty wrapping my head around tube sizing. I have a Shinko 705 for the rear and my local guy tells me the tube is on back order. He's ordering a 3.75-4.0. What the heck does that actually mean? I get the feeling it has something to do with the thickness of the rubber, but I've not explicity seen it. So, for my sanity, what is he talking about? Is that the right size for a Shinko 705 on the rear? I seem to see happy trails and other sites selling a 4.5-5.1 for our bikes....


Thanks in advance for any explanation... you guys always come through.

Trav

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post #2 of 12 Old 05-20-2012, 04:26 PM
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A 3.75-4.0 seems kinda small to me. I always use a 5.00-5.10 tube in my rear. Those numbers are basically the width of the tire the tube will fit.

A 130/90 tire is 130mm wide, or roughly 5 inches. When it comes to tires, the first number is the width in millimeters and the second number (90) is the aspect ratio, which means the tire is 90% as tall (from the wheel rim to the outside of the tread) as it is wide.

When it comes to inner tubes, it doesn't matter if the tire is a 130/80 or 130/90: all that matters is the width of the tire and the diameter, of course (17 inches for the KLR).

The one the guy is ordering for you will fit a tire that is 3.75 to 4 inches wide. I suppose it would work in a tire slightly larger than that. The standard rear 130mm KLR tire is about 5.11 inches wide, so I believe most use at least a 5" tube (5.00-5.10 inches).

Those numbers don't have anything to do with the thickness of the rubber. That's usually expressed in millimeters such as 2mm, 3mm,4mm, etc. or usually just terms like "standard, heavy duty, ultra-heavy duty, etc.



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post #3 of 12 Old 05-20-2012, 06:23 PM
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You want a 5 or 5.10
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post #4 of 12 Old 05-20-2012, 08:07 PM
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You need at least a 5.00 tube anything smaller will stretch out to much. Just remember tubes go thru the same heat cycles the tires do. this will make them thin once the tire is changed. A used tube does not feel like a new one for sure. Rule of thumb New tire=new tube.
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post #5 of 12 Old 05-20-2012, 08:45 PM Thread Starter
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Guys, thanks!
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post #6 of 12 Old 05-20-2012, 09:28 PM
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I disagree about new tires meaning a new tube. I bought new tubes to go on with the third set of tires. The factory tubes were heavier and looked better after 11k than brand new 'heavy duty' replacements. I kept the new ones for an emergency, but I reused the factory tubes again. I now have the part number for the tubes Kawi put in mine from the factory. I will change them at the next tire change. Generally, tubes last 2 - 3 tires without issues.
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post #7 of 12 Old 05-21-2012, 06:25 AM Thread Starter
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Ok, so one more (possibly odd) question... If the tube is decided by the tires width in inches, is that internal or external tire width? Outer wall to outer wall is exactly 5 inches, internal to internal is right at 4... Thanks again for all the help.
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post #8 of 12 Old 05-21-2012, 07:11 AM
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Quote:
Originally Posted by cato1978 View Post
Ok, so one more (possibly odd) question... If the tube is decided by the tires width in inches, is that internal or external tire width? Outer wall to outer wall is exactly 5 inches, internal to internal is right at 4... Thanks again for all the help.
It's the outside. This is a pretty good explanation of it all:

https://www.denniskirk.com/help_center/tire-sizes.jsp



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post #9 of 12 Old 05-21-2012, 08:28 AM Thread Starter
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Thanks! You guys have helped a LOT. Sometimes asking on a forum is tough because you get so many smart a$$ed answers, but you guys have always kept it easy.

Last edited by cato1978; 05-21-2012 at 08:29 AM. Reason: Edit for fat finger typo
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post #10 of 12 Old 08-27-2015, 07:44 AM
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Resurrecting an old thread for a new question. I tried searching, but could not find it.
I need a new rear tube. The tire is 130/80-17. My research says the tube should be a 5.00/5.10-17.
While shopping I find either a 4.75/5.10 tube or a 5.00/5.30 tube (but not 5.00/5.10). Would either of those work better than the other? Or should I keep shopping for the exact size?

BTW: What tube stem size; TR-4 or TR-6?
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