wannarat, Tire sizes are listed by the width, aspect ratio and wheel size. As in 110/90-18 The 110 is the width the 90 the aspect ratio the 18 the wheel size.
You can use these numbers to determine the height of a tire.
The aspect ratio is the ratio between the width of the tire to the height of the tire from bead to tread.
To determine the height you multiply the width by the aspect ratio by expressing the ratio as a percentage. In this case 90%. So 110 x 90% = 99. Now seeing as the tire is above as well as below the wheel multiply this by 2. 99 x 2 = 198. This is a metric number, to convert to inches you devide this by 25.4 as 25.4 mm = 1 inch. So, 198 devided by 25.4 = 7.79 inches. Add the wheel size, 7.79 + 18 = 25.79 inches tall.
The 16 inch wheel used a 130/90-16. So 130 x 90% = 117, 117 x 2 = 234, 234 devided by 25.4 = 9.21, 9.21+ 16 = 25.21
So the height difference is 25.79 - 25.21 = .58 inches. That's just a bit over 1/2 inch.
As mentioned this isn't much difference. This will at say 4500 rpms make about 1 mph difference in your speed.
The handling will be a bit different, the narrower tire will turn in quicker when cornering.
All of these things won't matter much to people that think the looks of a bike is more important than how it works.
Leo
You can use these numbers to determine the height of a tire.
The aspect ratio is the ratio between the width of the tire to the height of the tire from bead to tread.
To determine the height you multiply the width by the aspect ratio by expressing the ratio as a percentage. In this case 90%. So 110 x 90% = 99. Now seeing as the tire is above as well as below the wheel multiply this by 2. 99 x 2 = 198. This is a metric number, to convert to inches you devide this by 25.4 as 25.4 mm = 1 inch. So, 198 devided by 25.4 = 7.79 inches. Add the wheel size, 7.79 + 18 = 25.79 inches tall.
The 16 inch wheel used a 130/90-16. So 130 x 90% = 117, 117 x 2 = 234, 234 devided by 25.4 = 9.21, 9.21+ 16 = 25.21
So the height difference is 25.79 - 25.21 = .58 inches. That's just a bit over 1/2 inch.
As mentioned this isn't much difference. This will at say 4500 rpms make about 1 mph difference in your speed.
The handling will be a bit different, the narrower tire will turn in quicker when cornering.
All of these things won't matter much to people that think the looks of a bike is more important than how it works.
Leo