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Old June 11th, 2010, 11:23 AM   #1
DRivero
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Another tire question...

Okay, I have a silly question. I need tires. I've narrowed my choices down, but I'm stumped by something. My bike, as it came to me, has 100/80 16 front tire, and a 130/90 16 rear tire. I am quite short (slightly less than 5'2"). I'm not tippy-toeing on the bike, and I don't want to be, but some of the tires I'm looking at come in 100/90, not 80. So here is my question: since I already have a 90 on the rear, if I put a 90 on the front, will I notice, height-wise?

See, I told you it was a silly question.....
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Old June 11th, 2010, 11:33 AM   #2
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http://faq.ninja250.org/wiki/Do_tall...stock_sizes%3F
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Old June 12th, 2010, 03:08 PM   #3
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Yes you will notice a difference in the height if you put a 90 on the front. The 90 you have on the back has raised the rear about 1 inch from stock. If you go back with an 80 in the back it will lower the bike back to stock and may give your feet a little bit better reach to the ground.

Pirelli makes the Diablo Scooter tire in the stock size for the pre-gen. I have them on my bike and they have very good grip.

Stock front size: 100/80-16
http://www.denniskirk.com/jsp/tpl/ti...fCatId=&mmyId=

Stock rear size: 130/80-16
http://www.denniskirk.com/jsp/tpl/ti...fCatId=&mmyId=
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Old June 12th, 2010, 03:22 PM   #4
DRivero
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Snake, I read about those but I couldn't find them when I looked. Thanks for the link! Now, what about mileage?
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Old June 12th, 2010, 03:46 PM   #5
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They wear very good for a sport tire. Just an estimate on my part but you can expect about 15,000 miles from the front and about 10,000 from the rear. That of course depends on how aggressively you ride your bike. From what I hear you are quite the speed demon...Serously though I think you will like these tires.

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Old October 15th, 2010, 11:11 PM   #6
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Quote:
Originally Posted by DRivero View Post
Okay, I have a silly question. I need tires. I've narrowed my choices down, but I'm stumped by something. My bike, as it came to me, has 100/80 16 front tire, and a 130/90 16 rear tire. I am quite short (slightly less than 5'2"). I'm not tippy-toeing on the bike, and I don't want to be, but some of the tires I'm looking at come in 100/90, not 80. So here is my question: since I already have a 90 on the rear, if I put a 90 on the front, will I notice, height-wise?

See, I told you it was a silly question.....
The profile ht will be negligable, really. I doubt seriously you will even notice the ht difference. If you do, then re-check EVERYTHING because it is not the new tire.
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Old October 18th, 2010, 08:20 AM   #7
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Quote:
Originally Posted by DRivero View Post
Okay, I have a silly question. I need tires. I've narrowed my choices down, but I'm stumped by something. My bike, as it came to me, has 100/80 16 front tire, and a 130/90 16 rear tire. I am quite short (slightly less than 5'2"). I'm not tippy-toeing on the bike, and I don't want to be, but some of the tires I'm looking at come in 100/90, not 80. So here is my question: since I already have a 90 on the rear, if I put a 90 on the front, will I notice, height-wise?

See, I told you it was a silly question.....
My profs used to say, the only silly (stupid, etc) questions are those that go unasked...

Anyhow, to tire sizes. The stock rear tire was a 130/80-16 which works out to being 24.19" (nominal) diameter. Going to a 130/90-16 increases the diameter to 25.21" (nominal), which raises the axle by half the difference, 0.51", since half that extra diameter is above the axle. The seat is about 1/3 of the way from the rear to the front axle, so the seat would have risen about 3/8" more or less.

The stock front at 100/80-16 is 22.3" (nominal); going to a 100/90-16 increases the diameter to 23.09" (nominal), thereby raising the axle 0.4". The seat would go up about 1/3 of that, a little less than 1/8".

The net result is that it would be a little taller, but not that much and likely not enough to affect how your feet plant at a stop. Your speedo will read slower, so depending on how accurate it was before you'll need to be aware of its inaccuracies. The odometer will be more accurate.

Tire sizes broken down: 100/90-16. 100 is the tire width across the sidewalls in millimeters. /90 is a percentage of the width used to describe how tall the tire is from the bead to the tread. A /100 tire would be as tall as it is wide. A /50 would be half as tall as it is wide. -16 is the tire bead diameter, not the overall rim diameter. The recessed part of the rim where the tire rubber bead actually seats is the bead diameter.

Oh, most people perceive the height increase as much more than that typically because they're replacing a worn out tire missing a lot of tread thickness with a new tire that's larger in size. The axle very well could move up almost an inch in that case, but much of that lift is just replacing the worn away old tread thickness.

FWIW...
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