FIND YOUR PROPER FRAME SIZE

FRAME-SIZE CALCULATION

STEP 1: FIND OUT THE INSEAM/INSIDE LEG

Besides your body height, one more dimension is crucial to select the proper frame size: your personal inseam/inside leg. Depending on the desired bike type, the inseam/inside leg is the basis for an approximate calculation leading to the correct frame height for your dream bike. This is how it works:

Please stand with your back against a wall – barefoot and in underwear only. Your heels should touch the wall as well while your knees are straight and your pelvic area is positioned towards the ground in a linear (paraxial) way. The inseam/inside leg can be determined best by pulling a water level horizontally and as highly as possible into your crotch – the distance between the level’s upper edge and the ground is then measured via an inch or centimetre rule. If a water level is not available, you can also carry out the analysis by using a book which is flush with the wall on one side. In all cases, measuring the inseam/inside leg works best with the help of a partner.

STEP 2: CALCULATE THE PROPER FRAME HEIGHT

Based on the so correctly measured inseam/inside leg, the proper frame height (individually different for each bike type) can be defined by means of an approximate calculation: The measured numerical value in centimetres is now multiplied by a certain factor (different for each bike category). The result is the frame size in inches (1 inch = 2.54 cm). But only in few cases, the measured size will match exactly with the one offered by the manufacturer. Thus the following applies:

1. For an athletic riding style, please select the smaller frame size.

2. For a more relaxed seating position, please select the larger frame size.

FULL SUSPENSION

For the correct frame size of a full-suspension bike, please multiply the before measured inseam/inside leg by the factor 0.225.

Example: 79 cm x 0.225 = 17.775

Thus the optimal frame height would be about 18“/46 cm.

In case of this specific example, you should choose a 17” bike for an athletic riding style; a 19” version has a comparatively “tourier” character.

Too much calculations? The correct frame size can simply be read off from the following chart as well:

Body Height Frame Size approx.
155 – 165 cm 14 – 15“ 35 – 38 cm
165 – 170 cm 15 – 16“ 38 – 41 cm
170 – 175 cm 16 – 17“ 41 – 43 cm
175 – 180 cm 17 – 18“ 43 – 46 cm
180 – 185 cm 18 – 19“ 46 – 48 cm
185 – 190 cm 19 – 21“ 48 – 53 cm
190 – 195 cm 21 – 22“ 53 – 56 cm
195 – 200 cm 22 – 23“ 56 – 58 cm

MTB HARDTAILS

For the correct frame size of an MTB hardtail, please multiply the before measured inseam/inside leg by the factor 0.226.

Example: 79 cm x 0.226 = 17.854

Thus the optimal frame height would be about 18“/46 cm.

In case of this specific example, you should choose a 17” bike for an athletic riding style; a 19” version has a comparatively “tourier” character.

Too much calculations? The correct frame size can simply be read off from the following chart as well:

Body Height Frame Size approx.
155 – 165 cm 14 – 15“ 35 – 38 cm
165 – 170 cm 15 – 16“ 38 – 41 cm
170 – 175 cm 16 – 17“ 41 – 43 cm
175 – 180 cm 17 – 18“ 43 – 46 cm
180 – 185 cm 18 – 19“ 46 – 48 cm
185 – 190 cm 19 – 21“ 48 – 53 cm
190 – 195 cm 21 – 22“ 53 – 56 cm
195 – 200 cm 22 – 23“ 56 – 58 cm

ROAD & CYCLO CROSS

For the correct frame size of a road or cyclo-cross bike, please multiply the before measured inseam/inside leg by the factor 0.635. In this case, the result is the theoretical value of the frame height in centimetres.

Example: 79 cm x 0.635 = 52.165

Thus the optimal frame height would be about 52 cm.

Too much calculations? The correct frame size can simply be read off from the following chart as well:

Body Height Frame Size
155 – 165 cm 48 – 51 cm
165 – 170 cm 51 – 53 cm
170 – 175 cm 53 – 55 cm
175 – 180 cm 55 – 57 cm
180 – 185 cm 57 – 60 cm
185 – 190 cm 60 – 62 cm
190 – 195 cm 62 – 64 cm
195 – 200 cm 64 – ? cm

CROSS/CITY BIKES

For the correct frame size of a cross bike, please multiply the before measured inseam/inside leg by the factor 0.259.

Example: 79 cm x 0.259 = 20.461

Thus the optimal frame height would be about 20“/52 cm.

Body Height Frame Size
155 – 165 cm 47 – 50 cm
165 – 170 cm 50 – 52 cm
170 – 175 cm 52 – 55 cm
175 – 180 cm 55 – 58 cm
180 – 185 cm 58 – 61 cm
185 – 190 cm 61 – 63 cm
190 – 195 cm 63 – 66 cm
195 – 200 cm 66 – ? cm