Are you puzzled by bike tyre sizes, especially when you see markings like “700 x 38c”? Many cyclists, especially those newer to the sport, find the “C” in tyre sizes confusing. Let’s clear up this common misconception and delve into what “700 x 38c” truly means for your bike.
The confusion often arises from the way tyre sizes are printed, for example, “700X38C”. This leads some to believe that “38C” is the actual tyre size, perhaps when comparing it to other sizes like “650B x 38mm”. However, understanding the components of this sizing is crucial for choosing the right tyres for your bicycle.
The “700C” designation refers to the wheel diameter, not the tyre size itself. “700C” indicates that the tyre is designed to fit a 700c wheel rim, a standard size for many road, hybrid, and gravel bikes. Think of it as the wheel type. Just like there are different shoe sizes for adults and children, there are different wheel sizes for bikes, such as 700c, 650b (also known as 27.5″), and 26″.
On the other hand, the “38” in “700 x 38c” represents the tyre width in millimeters. Therefore, a “700 x 38c” tyre is designed for a 700c wheel and has a width of 38 millimeters when inflated. This width is a significant factor in determining the tyre’s rolling resistance, comfort, and grip. A wider tyre like a 38mm will generally offer more comfort and better grip on varied surfaces compared to a narrower tyre, such as a 25mm or 28mm, often favoured for purely road cycling for lower rolling resistance.
So, when someone says they are running “38C tyres”, they are likely misunderstanding the terminology. It’s more accurate and informative to say “700c tyres that are 38mm wide” or simply “700 x 38mm tyres”. Referring to a tyre size only as “38C” is incomplete and lacks the essential wheel diameter context. Imagine discussing shoe sizes by only saying “size 8” without specifying if it’s men’s, women’s, or children’s – the wheel diameter (700c, 650b, etc.) provides the necessary context for tyre compatibility.
In conclusion, when considering bike tyres and you come across the “700 x 38c” marking, remember that “700c” is the wheel diameter and “38” is the tyre width in millimeters. Understanding this distinction will help you choose the correct and best Bike Tyre 700 X 38c for your riding needs and ensure compatibility with your bicycle wheels.
