The bike size is defined by the frame size, not wheel size. These tire measurements are no indication of the actual size of the bike, only the wheels. Here you’ll find many variations in tread patterns, casings, and compounds.įor Downhill 2.5″ is probably the most common width as a compromise between traction and rolling speed, but a range between 2.4″ to 2.6″ is used regularly Usually widths from 1.9″ to 2.25″ are used here.Ī range from 2.25″ up to 2.5″ is common for Trail, All-Mountain, and Enduro. Depending on the type of riding, there are preferable ranges for tire widths.įor Cross Country and Marathon bikes, you’ll want the small profile of a narrow tire. Some kids’ bikes still come in 26″.Īs far as common tire widths go, there are many more viable options. It’s even become quite difficult to find 26″ rims and tires. 26″ wheels are not dead yet but are not nearly used as frequently as in the early 2010s when they were the standard. 27.5″ wheels are still very common on Downhill bikes, and lesser so on Enduro bikes. Right now the industry trends towards 29″ for Cross Country, Trail / Enduro, and even Downhill wheels. Cross Country tires are usually the narrowest ones at 2.0″, while Downhill tires tend to be the widest at 2.5″ on average. The standard tire width varies depending on the mountain bike discipline. There is no one single standard MTB tire size, however, 27.5″ and 29″ are the most common wheel diameters overall. So, what’s the standard mountain bike tire size? But if you’re a turbo nerd and really wanna know the real fine details of things, well 584 mm x 61 mm is the tires actual size. There are standardized tire diameter and width, which are the most important and informative measurements of an MTB tire. In order to read MTB tire sizes, all you really need to know are the numbers in the first row. Again in Millimeters, these 61 mm are the literal width of the tire at the widest part when it’s mounted on the correct rim width. So, if you go back to that 584 number you’ll see 61. Similar to the diameter, there’s another number. And secondly, it also will vary slightly depending on the rim width. But firstly, some brands actually measure this differently. For a tire laid flat on the ground, it would be straightforward. With a profile more like the one of a balloon, what part here is actually measured: the widest part or the part actually having contact with the ground.Ģ.5″ is roughly how wide the tread width is. Which should mean that the tire is 2.5 inches wide, right? Of course not, it’s never that simple. Let’s look at that next number: 2.5 This is the tire’s width in inches. That’s the literal inside diameter, measured from the tire’s bead. Those are 584 mm, which is referring to the bead seat diameter. It’s written in small letters real close to the bead. If you want to be really precise about it there’s this other number that you’re going to look at – it’s 584 in my case. Of course, the overall diameter is also depending on the rim width and tread pattern. It’s roughly the outside diameter of the tire when it’s mounted. That 27.5-inch number – well it’s sort of pulled out of thin air. The standard mountain bike tire diameters are 26″, 27.5″, and 29″. That means it’s a 27,5-inch tire in diameter. I think you already know what 27.5 stands for. Let’s talk about these letters and numbers in the first row: 27.5 x 2.4 WT.
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