Originally Posted by
steinrr
I have a tire that has the following markings:
28 x 1 5/8 x 1 3/8 37-622 700x35c
What I don't get is that the "37-622" part says that my tire has width of 37, while the last part (700x35c) says that width is 35. Should not these two numbers be equal? How can a tire be both 37 and 35?
("1 3/8" is close to 35 so I guess that is the correct tire width)
As noted above; the 37-622 is tied to actually measurable values.
The 28 x 1 5/8 x 1 3/8 means that the outer diameter is approximately 28 inches, the tire is approximately 1 3/8 inches wide and 1 5/8 inches tall.
700x35c has lost most of its ties to reality. It is less meaningful than the old USA Automobile tire designations such as: H70-15. 700 originally meant the the outer diameter of the mounted tire was 700mm, and c designated a 622mm BSD rim - no width designation was required, because (700-622)/2 = 39mm wide/tall tire. When people started making wider and narrow tires for the same 622mm BSD rim, everything lost meaning.