The choice of the frame

The choice of the frame has a big impact on the biking comfort, but it is not that simple when we cannot sit on it and just try it out. Over the years, a method has been developed that helps us choose the minimum size of the frame, so that after getting off the saddle the distance between the top frame tube and the crotch is at least 10cm. It is as follows:

1. Stand barefoot next to the wall.
2. Measure the distance between the ground and the crotch.
3. Multiply the result: - by 0.57 for a mountain bike - by 0.63 for a trekking bike - by 0.66 for a road bike.
4. This should be divided by 2.54 if you want to get the value in inches. This value represents the size of the frame you should be using.

Unfortunately you have to remember that these calculations are very general, considering the number of possible biking styles that humanity has invented. In addition, the length of the bike makes it even more difficult, as it has a decisive influence on your position on the bike. Fortunately, this element can be adjusted through some manipulation in our bike, namely: If you are "lying" too much on the bike, you can change the steering bracket for a shorter one or change the steering wheel for a "curved" one with a higher lift. Such changes will make your position on the bike more upright and comfortable. If, however, you feel that your body is leaning too much to the back and at the climbs you feel that the front wheel barely touches the ground or breaks away from it, shifting the saddle to the front at the yoke of the seatpost will be helpful.

Another thing is the style of biking. In the case of classical styles, such as mountain biking, road biking, or trekking, the sizes listed in the tables below mostly agree. However they will be different if you want to use the bike for more extreme rides, for example, in marathons or XC races, in 4 Cross, Enduro or Downhill. In such cases a smaller frame will be more suitable, smaller by at least one or even two sizes, and that is simply because a smaller bike is easier to maneuver. Be careful, however, not to overdo it with the small size, because it could have an adverse effect on the operation of the bicycle. It is therefore necessary to find a kind of a "golden mean", taking into account the mathematical calculations, the biking style, and the experience of other bikers.

Bicycles for adults
Body height
The length of the inside  
of the leg in centimeters
Frame size 
Frame size 
152 cm 71 cm 14” (36cm) 16”  (41 cm)
157 cm 72 cm 15” (38 cm) 17”  (43 cm)
162 cm 74 cm 16” (41 cm) 18”  (46 cm)
167 cm 75 cm 16” (41 cm) 18”  (46 cm)
172 cm 76 cm 17” (43 cm) 19”  (48 cm)
175 cm 77 cm 17" (43 cm) 19”  (48 cm)
177 cm 79 cm 18" (46 cm) 20”  (51 cm)
182 cm 82 cm 18" (46 cm) 20”  (51 cm)
187 cm 86 cm 19" (48 cm) 21”  (53 cm)
192 cm 89 cm 20" (51 cm) 22”  (56 cm)
197 cm 92 cm 21" (53 cm) 22”  (58 cm)


Bicycles for children
The length of the inside 
of the leg in centimeters
The size of the bicycle frame 
The size of bicycle
4-6 age 48 cm lack 16”
5-8 age 53 cm 11” 20”
5-8 age 56 cm 12” 20”
5-8 age 58 cm 13” 20”
7-12 age 66 cm 14” 24”
7-12 age 69 cm 15” 24”