Trail and all-mountain bikes: 2.3' to 2.5' wide.Cross-country bikes: 1.9' to 2.3' wide.Mountain bike tires: Outer tire diameters can be 26', 27.5' or 29' widths range from 1.9' to nearly 5'.(As long as your replacement tire size matches your original, though, no need to worry about what style of bike you might have.)

Typical tire sizes: The example sizes below give you a rough guide for tire sizes on different types of bikes today. Plus-size tires, a tweener option between standard and fat, might be 3' or more. The same rule on size applies, though: Match what’s on the sidewall of your current tires in both diameter and width, which might be 4' or more on a fat-tire bike. They work well on snow or sand, and offer a cushy, grippy ride wherever they go. Things like rim size, fork size and frame tolerances make things tricky here, though, so talk to a bike shop before trying this.įat tires and plus tires: Fat-tire bikes are the ones you see with obviously gigantic tires. Some riders opt for wider tires, for example, to give them more traction and a somewhat cushier ride. While tire diameter should be an exact match, you do have the option of putting on a tire with a slight variation in width. This system states the 622mm inner tire diameter, rather than the 700mm outer tire diameter, because a key concern is ensuring that wheel size (outer diameter) and inner tire diameter align with one another.Įven though ISO numbers are starting to show up on tires, they aren’t commonly stated elsewhere so you only need to pay attention to an ISO number if it’s the only sizing number you have to work with. As long as your new tire’s size matches one of these sets of numbers, the new tire should fit your bike.Ī tire size you might see on a mountain bike:Ģ9 x 2.3 indicates a tire with a 29' outer diameter and a 2.3' width.Ī tire size you might see on a road bike:ħ00x25c indicates a tire with a 700mm outer diameter and a 25mm width.Ī third type of tire size might appear on either a mountain or a road tire:Ģ5-622 is the International Standardization Organization (ISO) way of identifying the 700x25c tire in the example above. You might see just one set of sizing numbers on a tire, or two or even three.

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