N
nics
Guest
What does the “c” in 700c stand for? My first guess would be, of course, centimeter, but a wheel with a diameter of 700 centimeters would be nearly 23 feet across! Thanks
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L
laser
Guest
The "C" formerly indicated the width of the tire. 700-size tires come in a variety of widths and "A" once meant the narrowest while "D" meant the widest. Nowadays, the letters more correctly indicate tire diameter
As you’ve obviously seen, bike tires have printed on their sidewalls a sequence of two sets of characters separated by "x". The first set, usually a number, tells you the tire’s diameter (measured, at the bead, the circular piece of metal or plastic embedded into the tire that holds it into the rim). The second set of characters indicates the tire’s width, sometimes followed by an extra letter at the end to indicate the true diameter
It turns out that a 700 C tire actually has a bead diameter of 622 millimeters. So why do they call it 700? For the same reason a 2-by-4 piece of wood has neither 2 nor 4 as its dimensions; it really measures 1.5 by 3.5 inches, but "2 by 4" rolls off the tongue better, and probably sells better too. To complicate matters, a tire labeled 700 B has a diameter of 635 mm and a 700 D tire has a diameter of 587 mm.
But it doesn't stop there, you can’t trust any of the inch diameters, for example A tire labeled 26" might actually come in at around 24 ¼ inches (it varies by type of tire), while a tire that claims 27" might measure roughly 24 ¾ inches.
The second set of characters, the width measurement, doesn’t cause much trouble if it appears in millimeters, as in 700 x 32 (usually shown as 700 x 32 C, with the C, as I said before, indicating the true diameter—in this case, 622 mm).
But if the width appears in inches. It sometimes appears as a decimal, as in 26 x 1.75, and sometimes as a fraction, as in 26 x 1 ¾. You’d think that a 26 x 1.75 tire has the same size as a 26 x 1 ¾ tire. In reality, the first one has a slightly larger diameter.
Fortunately, you won’t usually get thrown by this amusingly chaotic measurement "system" unless you want to replace your bike’s wheel or install a tire having a different width.
hope that helped you out and didn't confused you too much , as you can see , never beleive the figures
As you’ve obviously seen, bike tires have printed on their sidewalls a sequence of two sets of characters separated by "x". The first set, usually a number, tells you the tire’s diameter (measured, at the bead, the circular piece of metal or plastic embedded into the tire that holds it into the rim). The second set of characters indicates the tire’s width, sometimes followed by an extra letter at the end to indicate the true diameter
It turns out that a 700 C tire actually has a bead diameter of 622 millimeters. So why do they call it 700? For the same reason a 2-by-4 piece of wood has neither 2 nor 4 as its dimensions; it really measures 1.5 by 3.5 inches, but "2 by 4" rolls off the tongue better, and probably sells better too. To complicate matters, a tire labeled 700 B has a diameter of 635 mm and a 700 D tire has a diameter of 587 mm.
But it doesn't stop there, you can’t trust any of the inch diameters, for example A tire labeled 26" might actually come in at around 24 ¼ inches (it varies by type of tire), while a tire that claims 27" might measure roughly 24 ¾ inches.
The second set of characters, the width measurement, doesn’t cause much trouble if it appears in millimeters, as in 700 x 32 (usually shown as 700 x 32 C, with the C, as I said before, indicating the true diameter—in this case, 622 mm).
But if the width appears in inches. It sometimes appears as a decimal, as in 26 x 1.75, and sometimes as a fraction, as in 26 x 1 ¾. You’d think that a 26 x 1.75 tire has the same size as a 26 x 1 ¾ tire. In reality, the first one has a slightly larger diameter.
Fortunately, you won’t usually get thrown by this amusingly chaotic measurement "system" unless you want to replace your bike’s wheel or install a tire having a different width.
hope that helped you out and didn't confused you too much , as you can see , never beleive the figures
