The dimensions of a 28 x 1 5/8 x 1 3/8 bike tire are 28 inches in diameter, 1 5/8 inches in width, and 1 3/8 inches in thickness.
The with of a bike tire wheel in mm would be 622-20. This is math.
C as in 700C is a leftover from an old french sizing system. Doesn't say much today. Sheldonbrown.com has nice writeup about tire sizing. It's better to stick with the ETRTO marking of diameter (in mm) and width (in mm). A 700C tire will be 622 x 23-38 mm. 23 mm width for a road bike, 38 mm for a hybrid.
Front 28-29 psi, rear 36-38 psi.
38% of 28= 38% * 28= 0.38 * 28= 10.64
Front 28 PSI. Rear 38 PSI.
38''X75" 38''X75"
36 front 38 rear The correct amount as per the metal label on my Harley 883 XLC is 30 front tire and 40 rear. Just check your bike should have a tag on it that says the correct amounts for your bike if it is the original frame and all.
The sum is 28+38 = 66
One possible answer... (38 - 28) + (38 / (23+15)) + 28 = 39
28/38 = 14/19
The answer depends on whether it is the linear dimensions that are increased by 38% or the area.
38" x 75"