Bicycle Wheel Outer Diameter

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.

Bicycle wheel outer diameter. Remember when purchasing a new tire measured by the iso system the width is listed first followed by the diameter. For example a bicycle wheel sized 39 x 700 would have tread 39 millimeters wide and a wheel with a 700 millimeter diameter from the outer edge of one side of the tire to the other. Wheel diameter rim diameter tire diameter 2. 530 mm is the outside diameter and the iso e t r t o.

27 5 650b wheels iso 584 mm. 24 inch iso 507 mm. I won t argue that it s correct just that it s simple and as likely to be right as any other strategy. Hi hart the internal width of the dm18 is 17 9 18mm.

The typical 26 mtb tire has a rim diameter of 559 millimetres 22 0 in and an outside tire diameter of about 26 inches 660 mm. It s the same with our r rims 700c road. Additionally the bsd would be 622 mm. Size variations of tubulars are covered in sutherland s handbook for bicycle mechanics 7th edition available from sutherland s and on the mechanic s bookshelf at better bike shops.

Standard road bicycle wheel size today is 622 mm and it usually takes tyres of 23 622 or wider 25 622. 24 inch clincher tires with inner tubes are the most common wheel size for junior mountain bikes. Multiplying by 25 4 gives the diameter in millimeters 530 mm. The table below gives common and uncommon rim sizes with the corresponding bead seat circumference dimensions.

Full sized tubulars fit rims of the same diameter as 622 mm 700c clinchers. 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. These sizes can be thought of as a sort of shorthand for decimal sizes each with a corresponding iso measurement. Diameter is a few millimeters smaller so this is a 520 mm rim.

Mountain bike wheels are described by the approximate outer diameter of the rim plus a wide 2 inch tire. 29er rims have a diameter of 622 millimetres 24 5 in and the average 29 mountain bike tire is in iso notation 59 622 corresponding to an outside diameter of about 29 15 inches 740 mm. The actual iso diameter of a traditional 26 wheel is 559 millimeters. The sizes you commonly see for mountain bike wheels like 26in 27 5in and 29in all refer to the outside diameter of the wheel with the tire fully inflated.

Since the tire wraps around your rim the wheel diameter includes the tire on both sides thus the multiplication by 2. Bikecalc takes this view.