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Join Date: Apr 2008
Location: Wayne, NJ
i am wondering what is the difference between the 100/90, 110/90 and 110/80. and will all of these fit on the front of our bikes.
The first number is the tire width and the second number is the aspect ratio of the sidewall (height as a proportion of the width). 100/90 is a width of 100, and a sidewall of 90% of 100, which is 90. 110/90 is a width of 110, and a sidewall of 90% of 110, which is 99. 110/80, sidewall of 88. In inches, 100/90 (stock) is 3.54 inches, 110/90 is 3.90 inches, and 110/80 is 3.46 inches.
They all fit the bike. The difference will be in the handling, and in the speedometer. Based on previous threads, the 110/90 will yield a speedo reading closest to actual. 100/90 will be about 5% less than actual IIRC. Finally, that means that the 110/80 will show greater than 5% less than actual. Taller sidewall = higher circumference, Shorter sidewall = lower circumference; hence, different readings on the speedo. A narrower tire will have less of a contact patch (assuming the same shape) so steering and braking will be affected.
I hope this wasn't too long winded!
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