Frame size help

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All Ribble frame sizes are quoted as a centre to centre size. The centre to centre size is determined by measuring the distance from the centre of the bottom bracket to the centre of the seat cluster at the point of which the centreline of the seat tube and the centreline of the top tube cross.

In order to establish your correct frame size you will need, first of all, to accurately measure your inside leg, (in cm).

The inside leg length (in cm) is measured as follows:

- Stand straight up on your bare feet (do not wear any shoes).

- Position the inside of your feet approximately 200mm apart.

- Pull a tube with a diameter of approx 35mm (or the back of a book) firmly to your crutch until you can feel it against the bone.

- Position yourself in the middle of the tube or book.

- Measure the distance (in cm) from the feet to the top of the tube both in front of you as well as behind you (see image, right). Add those two sizes and divide the respective result by two. The result is your inside leg measurement.

HORIZONTAL GEOMETRY (Horizontal Top Tube)
Use the formula: Inside leg measurement (cm) x 0.65. The resultant size should be rounded up or down to whichever is the nearest frame size option.

SLOPING GEOMETRY (Sloping Top Tube)
Use the formula: Inside leg measurement (cm) x 0.65. Deduct 4cm from the resultant size and round up or down to the nearest frame size option.

Need more help? Contact us and we’ll go through it with you.