How To Measure A Bike Rim
The calculation here will give you your bike s frame size.
How to measure a bike rim. These different wheel and frame sizes help companies design bicycles that will fit kids of all ages and heights. 1 with your child standing with his back against the wall align the book vertically on the wall between your child s legs up to the crotch area. The wheel size is based on the diameter of the tire see below and as each tire size gets larger so does the size of the bicycle frame. The complete bicycle tire size guide.
A wide metal tape measure won t fit into the well of the rim and and won t curve smoothly around the rim don t trust a fabric measuring tape as used in fitting clothing. If it is just the frame this will be the center point in the bottom bracket shell. This kind is usually inaccurate because the fabric stretches. Therefore a 20 622 tire is a tire 20mm wide that fits on a rim with 622mm in diameter typically a road bike rim or a 29er one.
Measure the distance between the wheel s hub or axle assembly and the outer edge of the wheel s rim. The wheel size for a mountain bike or any other type of bike is a combined total of the rim diameter and the thickness of the tire itself. Then use a tape measure to measure the distance from the ground underneath the tire to the center of the wheel to get the radius. 12 inch 16 inch 20 inch and 24 inch.
To measure your bike s frame size take a measuring tape and place the tape in the center bolt of your bike s cranks. The most common sizes are. Many mountain bikes have a 26 inch wheel again meaning the rim plus tire but you can determine for sure using one of two methods. To measure a bicycle wheel start by standing the bike upright by leaning it against a wall or using the kickstand.
Remember to get yourself a 150 psi portable pressure detection electric bike pump after knowing the right tires to buy for your bike. Next multiple the radius by 2 to get the diameter. Also the rim s diameter expressed in this manner coincides with the inner diameter of the tire. After measuring you can refer to a bike size chart as provided in this article to find your child s suitable bike size.
To measure the inseam you need a yardstick and a medium sized book. Bike frame sizes are measured in the same way for all styles of bicycle. In most cases riders usually go with whatever bike tire that will come along or leave the task to the local bike shop when it s time to replace or upgrade a tire. The size of the bike tire is one of the commonly ignored aspects among the casual riders.
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