Road Bike Tire Sizes Explained

The letter at the end of a tire size is a throwback to an old french system when the letters a b and c designated different inner tire diameters it does not stand for cm. Most road tire widths are less than 30mm but you can also find tires as wide as 45mm on bikes intended for gravel roads. Some older road bikes still have the 27 inch size.

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27 5 650 6fattie or even just plus tires.

Road bike tire sizes explained.

Because of the high pressure and desired low rolling resistance road tires come in narrow widths. Most road bikes have a 700mm outer diameter with widths starting at 23mm. A narrower inner tube will balloon out to. A standard road tire is 700c x 23mm indicating a tire diameter of approximately 700mm and a width of 23mm.

27 5 584 mm 650b tires. Road tires generally come in the size 700c which roughly equals 700 millimeters. Road bike tires generally come in three widths. While you can find a variety of bikes with wheel sizes ranging from 16 to 27 5 inches the most common sizes include 26 inches 27 5 inches 29 inches and 700c.

When it comes to choosing width there are two major factors at play. 32 iso 686 mm and 36 iso 787 mm while extremely uncommon custom built frames for very tall riders often use 32 or 36 wheels. Up to 2 5 wide. Used on mountain bikes these tires also go by the names.

The first number refers to the rim diameter in millimeters in most cases this figure is 700c. 23c 25c and 28c their width in mm. 26 1 3 8 1 1 2. Finding the right inner tube depends on the size of the tires on your bike.

The second number refers to the tire diameter in millimeters in most cases this ranges from 23mm to 28mm for road tires but can be upwards of 35mm for cyclocross and recreational use tires. Tubes can range anywhere from 1 to 3 inches or 19 to 45 millimeters depending on the type of wheels you have. These sizes are almost never found on production bikes but if you re over 6 6 and looking for a bike that fits custom built might be the only way to go. Iso etrto mm english size inch french size mm 35 584.

All inner tubes will come with a recommended range for tyre width for example 700 20 25 for traditional road tyres 700 25 32 for wider road tyres. Size used on some high performance road and triathlon bikes especially those designed for smaller riders. When shopping for road tires you ll look for 700c x your preferred width 23mm being the slimmest option and going up to 36mm. Some bikes especially triathlon bikes are available with wheel diameters of 650 or 650c.

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