BIKES SIZING
Measure your inside leg:
The step length is the length of the inside of the leg. The best and most accurate measure of your stride length is by using a spirit level and a tape measure. If you have no spirit level to hand a book or similar works as well. Now, position yourself barefoot (!) on a flat surface and clamp the level (or the book) as level as possible between the legs and pull it upwards until it becomes gradually unpleasant. Now measure the distance from the top of the level to the ground. The reading corresponds to your stride length.
Determine the right frame size:
For a Road bike
Multiply your inside leg by a factor of 0.665. The value that you get is the theoretical frame height in cm. For a Triathlon bike subduct 3cm of your value. For a Mountain bike: Multiply your inside leg by a factor of 0.226. The value that you get is the theoretical frame height in inches. Multiplied by 2.54, you get the frame height in cm.
For trekking bikes
Multiply your inside leg by a factor of 0.66. The value that you get is the theoretical frame height in centimeters. Multiply by 0.259 to get the frame height in inches. With suspension seat posts deduct about 5 cm (or 2 inches) from the theoretical size.
If your value is between two offered heights, apply the following rule of thumb: Choose the smaller frame size for sporty driving style. A larger frame results in a more comfortable seating position
Determine the framesize by your body size:
Alternatively you can determine your framesize also about your body size. However, the method of the step length is more accurate.
ROAD BIKES SIZING
Body Size
155 - 165 cm
165 - 170 cm
170 - 175 cm
175 - 180 cm
180 - 185 cm
185 - 190 cm
190 - 195 cm
195 - 200 cm
Framesize
48 - 51 cm
51 - 53 cm
53 - 55 cm
55 - 58 cm
58 - 61 cm
61 - 63 cm
63 - 65 cm
65 cm +
MOUNTAIN BIKES SIZING
Body Size
155 - 165 cm
165 - 170 cm
170 - 175 cm
175 - 180 cm
180 - 185 cm
185 - 190 cm
190 - 195 cm
195 - 200 cm
Framesize (inches)
14 - 15"
15 - 16"
16 - 17"
17 - 18"
18 - 19"
19 - 21"
21 - 22"
22- 23"
Framesize (cm)
35 - 38 cm
38 - 41 cm
41 - 43 cm
43 - 46 cm
46 - 48 cm
48 - 53 cm
53 - 56 cm
56 - 58 cm
TREKKING BIKES SIZING
Body Size
155 - 165 cm
165 - 170 cm
170 - 175 cm
175 - 180 cm
180 - 185 cm
185 - 190 cm
190 - 195 cm
195 - 200 cm
Framesize
47 - 50 cm
50 -52 cm
52 - 55 cm
55 - 58 cm
58 - 61 cm
61 - 63 cm
63 - 65 cm
65 cm +