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Rim & tires Sizes for hub motors

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    Rim & tires Sizes for hub motors

    Luna cycles uses the traditional sizing systems and are based on a measurement of the outside diameter of a tire. This would usually be measured in inches (26", 27", etc.) or millimeters (650, 700, etc.)., not like a motorcycle or a car rim that uses the diameter of the inner rim lip.

    So when you order a 20 inch rim with your motor you will get a rim that is about 17 inch in diameter. The missing 3 inch is the actual tire.


    What about 700C VS 29?

    700C is basically the same as 29er..

    29er is the common name in the USA for MTB and 700C is the common name for road bike but both uses 622 mm ISO (inside rim diameter).


    So a 700C 28 is basically a 1inch 29er and 29er 2" is also a 700C 50mm.


    Confusing? YES, the 26,27.5,29 and 700C are all wrong… The traditional sizing systems are based on a measurement of the outside diameter of a tire. This would usually be measured in inches (26", 27", etc.) or millimeters (650, 700, etc.). and now since that we have many tires sizes for each rim size the sizing are not true. Unfortunately, evolution of tires and rims has made these measurements lose contact with reality

    the only true way is the ISO sizing… it is way better because is uses the actual inner rim diameter (like a car or a motorcycle) and not the total diameter of the inflated tire.

    The ISO system uses two numbers. The first is width in millimeters. For the rim, this is the inner width between the flanges, for the tire, it is the inflated width. This will vary a bit depending on the width of the rim.

    The second ISO number is the critical one: it is the diameter of the bead seat of the rim, in mm ("B.S.D."). Generally, if this number matches, the tire involved will fit onto the rim; if it doesn't match, the tire won't fit.

    For example, a 700 × 28 C road tire would be a 28-622; and a 29er 2.1" would be a 50-622

    Hope that helps.
    Last edited by Sebz; 02-14-2018, 09:44 AM.
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