Tire height vs Gearing 180/55 vs 190/50 vs 190/55 vs 200/50 - Kawasaki Forum :: KawasakiWorld.com
 
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post #1 of 7 Old 03-07-2006, 08:19 PM Thread Starter
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Tire height vs Gearing 180/55 vs 190/50 vs 190/55 vs 200/50

Alright so I'm not going w/200s

Trying to get some idea of what kind of gearing changes I need to make for maxton.

Assuming 18/45 gearing the dunlop 200 tire is good for 201. I believe that given my 199.57 run @ around 12k indicated (12.2 is my indicated limiter)

Going w/some lighter, stickier tires. I was thinking 180/55 (pirelli sc2).

Even though that is a taller tire, is it negated (and if so by how much) because it isn't as wide and has to spread the 6" distance across the wheel?

Would a 190/55 be the same height as the 180/55 once mounted? How much MPH can I expect gained @ 6th limiter?

Any advice would greatly be appreciated. I want a sticky street legal tire and for street/drag/lsr I think a race take off sc2 is a good choice.

I think sc2 come in 180/55 and 190/55.

Also, per sport rider, not all 190/50s weigh MORE than their 180/55 counterparts, further confusing the issue

thoughts?

A.
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post #2 of 7 Old 03-07-2006, 09:03 PM
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I have a sc2 190 "pie-relli" mounted on my beast that I can measure the rolling radius if it will help. there must be somebody with a 180 mounted that could do the same. compare them to yours and you will have a start. I would be willing to bet there are charts online that will cross final drive / RPM / rolling radius to get you real close. However it is all relative to traction I think .
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post #3 of 7 Old 03-08-2006, 06:54 AM Thread Starter
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Traction and clutch slip too, indeed.
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post #4 of 7 Old 03-08-2006, 07:28 AM
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I had a 180/55, and it really didn't work with me... The 12 has to much power for the 180/55 tire.... I know, because I went down on it... The tire brakes loose allot with the 180/55. I now have the 190/50 and at works good for... I think the 190/55 would work good too.
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post #5 of 7 Old 03-08-2006, 07:41 AM
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My understanding is that it works like this:

A 200/50/17 tire is 200mm wide and 100mm tall (50% of 200)
A 190/50/17 tire is 190mm wide and 95mm tall (50% of 190)
A 190/55/17 tire is 190mm wide and 104.5mm tall (55% of 190)
A 180/55/17 tire is 180mm wide and 99 mm tall (55% of 180)

The 180 is taller in relation to it's width, however the 200 "should" be a hair taller overall. A 190/55 would be the tallest of the bunch. Fitment on the rim is a big variable as well.

Of course, tires are never precisely what the numbers say. So, there might be a tall 180/55 out there.

Shane
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post #6 of 7 Old 03-08-2006, 08:11 AM
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Quote:
Originally Posted by s_vig
I had a 180/55, and it really didn't work with me... The 12 has to much power for the 180/55 tire.... I know, because I went down on it... The tire brakes loose allot with the 180/55. I now have the 190/50 and at works good for... I think the 190/55 would work good too.
That is the first time I have ever heard that about a 180/55 on a 12.

I hate stupid people.
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post #7 of 7 Old 03-08-2006, 04:45 PM
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i just went through figuring final gearing with my duster. find out what your roll out is in inches than figure the final drive ratio with the 6 gear ratio at max rpm at the books revlimiter not your tach. i did mine fairly easy but mine is 1 to 1 in drive

6500rpm / 4.33 (gears) is 1501 tire rpms. at 91.06" a turn it is 11,390 feet per min. X 60 min for a hour 683,405 feet fer hour / 5280 (feet in mile) is 129 mph at 6500 rpms with no converter slip

mesure your roll out and do the math and you can find out exactly which size you need minus clutch slip.

i spent the time to do this cause my 600hp 440 drops off fairly hard after 6400 rpms and in good air i am seeing 6800 rpms at the end of the track. i am going to 4.11 now. the 4.33 were great for the summer but i may get my other 9" with the 4.33 and get 3.89 for spring and fall.
try to figure it out. guessing is expensive.
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