Bicycle Wheel And Tire Diameters

A iso tire size of 28 622 which of course is backwards b c it s european from how we would refer to a 700 x 28c tire has a tire width of 28 mm and a rim diameter of 622 mm.

Bicycle wheel and tire diameters. If you want a very accurate measurement for your own bike often to setup your bicycle computer use the valve as a marker and roll the bike along a straight line for one wheel revolution. Road tires generally come in the size 700c which roughly equals 700 millimeters. 57 622 60 622 and similar. Then measure this distance.

Let s start with the 26 x 2 125 size that became popular on heavyweight balloon tire bikes in the late 30 s and still remains common on beach cruiser bikes. Here s how it works. Today when off road bicycles with wheels larger than standard mtb wheels started to be popular it s wheels are marketed as 29 but in fact are 622 wheels with wider tyres so that outer diameter is close to 29. If you find the width of your bike tires minor simply use the diameter which in this example is 622 remember however that the rim of your bicycle tires must be narrower than the tire itself.

They carry some of the advantages of both formats with a smoother ride than a 26 inch wheel and more stiffness and durability than a 29 wheel. The chart is only applicable to light bicycle rims with a unique rim tire interface. Some older road bikes still have the 27 inch size. 27 5 inch mountain bike wheels which some also refer to as 650b use a rim that has a diameter of 584 mm 23 0 with wide knobby tires 27 5 x 2 3 iso 58 584 are approximately the midway point between the 26 inch iso 559mm and the 29 inch iso 622mm standards.

Standard road bicycle wheel size today is 622 mm and it usually takes tyres of 23 622 or wider 25 622. Some bikes especially triathlon bikes are available with wheel diameters of 650 or 650c. Because of the high pressure and desired low rolling resistance road tires come in narrow widths. Unfortunately evolution of tires and rims has made these measurements lose contact with reality.

Nowadays bike tires are typically marked according to iso standard. The actual iso diameter of a traditional 26 wheel is 559 millimeters. To get the approximate diameter of the wheel with the tire on you would take the diameter of tire x 2 because it s both on the top and bottom the diameter at the rim pi 3 14 to get the cimcuference. Road rims tires internal rim width mm 17 19 20 21 22 23 24 25.

This would usually be measured in inches 26 27 etc or millimeters 650 700 etc. If you choose to buy a bicycle tire that is wider than your old tires be sure that the tire will be a bit. If we assume that the numbers are not worn away on your deck and example is 32 622 on your bicycle tires describes the 622 tire diameter while the 32 stands for the width of your bike tires. The traditional sizing systems are based on a measurement of the outside diameter of a tire.

Tyres for those bicycles are always marked with iso standard sometimes along with the old standard 29 saying something like. If you use rims of other brands please send a rim profile to the tire maker for recommendations. This size tire is very close to. Inch based identifications indicate the width in a decimal 26 1 75 or as a fraction 26 1 3 4 and although these size identifications can be mathematically equal they also can.

The iso standard notation uses the diameter of the wheel bead seat in millimeters preceded by the inflated tire width in millimeters. Tire size 23 25c tire size 25 28c tire size 28 30c tire size 30 33c tire size 33 35c. As with most bike wheel naming conventions the term 26 inch does not refer to the diameter of the wheel itself but rather the approximate outside diameter of the tire that fits this wheel size. An outer diameter of 670mm 2 12m circumference.