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post #1 of 32 Old 08-19-2011, 11:41 AM Thread Starter
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Tire Size Question/help

Ok, so the tire on my bike ATM is 130/80-17 65H.
I was about to order a 130/90-17 TT as recommended by someone. (these are Shinko 705s)

Please advise/educate/enlighten/flame/torment/etc.

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post #2 of 32 Old 08-19-2011, 12:05 PM
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:As I understand it, the 130/90-17 is fine it is 10mm wider but fits fine, and they worked fine on my KLR when I had one.

~Things work out best for those that make the best of the way things work out~

Last edited by masterlink; 08-19-2011 at 12:08 PM.
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post #3 of 32 Old 08-19-2011, 01:00 PM Thread Starter
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Can you think of any advantages/disadvantages I might see?

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post #4 of 32 Old 08-19-2011, 01:10 PM
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130 is the width. Both tires are 130 mm wide, or 5 1/8".

The 80 and 90 are the aspect ratio. That is, the 80 tire has a cross section that is 80 percent of the tire's width. That would be 104mm.

The 90 tire has a cross section that is 117mm.

Thus the 90 tire has an over all diameter that is (117-104)X2 = 26mm taller. That's just about an inch taller.

It will make your overall gearing somewhat higher. Without running the numbers, I'm going to guess that's on the order of 4%, or about equivalent to adding two teeth to the rear sprocket.

T

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post #5 of 32 Old 08-19-2011, 01:27 PM Thread Starter
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I wonder if that would work well with a 16t front for all the high way riding I do.

Red '09
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post #6 of 32 Old 08-19-2011, 01:33 PM
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Figure you've got about a 10% increase over stock gearing with the 130/90 tire.

With a stock engine I had trouble pulling hills in 5th with a 16 tooth - had to gear down.

I also didn't like it in the twisties, as the already-too-tall 1st gear was even taller. I was constantly hunting back and forth between 1st and 2nd when trying to run at about 35 mph.

The 685 has enough torque to pull the hills in 5th, but the 1st/2nd issue in the twisties persists.

Adding 4% on top of the 6% from the 16 tooth might make the 1st/2nd issue in the twisties more tolerable, as first will run out a bit longer.

I've never run a 130/90. Might have to try one in about 5000 miles ;^).

T

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“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


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Last edited by Tom Schmitz; 08-19-2011 at 01:36 PM.
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post #7 of 32 Old 08-19-2011, 01:36 PM Thread Starter
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Odd. Altitude maybe? I run hills all the time in 5th and have had nary an issue. Hmm. Well, I don't have a 16 tooth yet. Maybe I'll hold off on that and try the taller tire.

Red '09
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post #8 of 32 Old 08-19-2011, 01:38 PM
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Not altitude - it was having the 16 tooth primary with a stock engine. Not enough torque to pull a steep hill at 70mph.

No problem with a 15 tooth.

Remember, this is my experience on a sample of one! I, and my gear, load the bike up with about 300 pounds. Figure in your load when assessing what the bike will do going up a steep hill at freeway speeds.

Does AZ have many steep hills on you interstates? Serious question.

T

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“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


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post #9 of 32 Old 08-19-2011, 01:38 PM
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Hey Tom thanks for educating me about that. I was/am bad with math and numbers!

~Things work out best for those that make the best of the way things work out~
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post #10 of 32 Old 08-19-2011, 01:42 PM
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masterlink -

No worries! I learned this long ago with car tires when radials first became popular. The terminology is not quite spot-on for motorcycle tires, as they don't have true sidewalls (being a rounded profile instead of squared-off), but the concept holds.

T

Tom [email protected]

“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.
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