The optimal frame height for your BULLS bike

The right frame size is a prerequisite for comfort, performance and permanent fun while riding.

Don't worry if you are not certain.

You can calmly place your order online anyway. We recommend collection from the BULLS specialist dealer as a supplier in that case. Your bike will be adjusted to your individual size by a specialist there. If you have chosen the wrong frame size, we will strive to find a solution. 

You could also just go to the BULLS specialist dealer right away for advice and take your pick during a test ride.

Recommendations by bicycle type

Find an overview of the different factors and sizes that influence frame geometry and the final sitting position and entire riding experience below.

Our size recommendations for your BULLS bike according to the different bicycle types and areas of use. The information in the table serves as a reference. Your individual frame size may differ depending on your build. 

Mountainbikes


Body size: 150-160 cm 

  • recommended frame size: 33-36 cm
  • recommended wheel size: 26 Zoll

Body size: 160-170 cm 

  • recommended frame size: 38-43 cm
  • recommended wheel size: 26 or 27.5 Zoll

Body size: 170-180 cm 

  • recommended frame size: 43-47 cm
  • recommended wheel size: 26, 27.5 or 29 Zoll

Body size: 180-190 cm 

  • recommended frame size: 47-52 cm
  • recommended wheel size: 26, 27.5 or 29 Zoll

Body size: 190 cm and larger

  • recommended frame size: from 51 cm
  • recommended wheel size: 27.5 or 29 Zoll

 

MTB

Road Racing & Gravel Bikes


Body size: 150-160 cm 

  • recommended frame size: 47-49 cm

Body size: 160-170 cm 

  • recommended frame size: 49-53 cm

Body size: 170-180 cm 

  • recommended frame size: 53-57 cm

Body size: 180-190 cm 

  • recommended frame size: 57-62 cm

Body size: 190 cm and larger

  • recommended frame size: from 62 cm

 

Gravel

Trekking & Cross Bikes


Body size: 150-160 cm 

  • recommended frame size: 42-47 cm

Body size: 160-170 cm 

  • recommended frame size: 47-50 cm

Body size: 170-180 cm 

  • recommended frame size: 50-55 cm

Body size: 180-190 cm 

  • recommended frame size: 55-60 cm

Body size: 190 cm and larger

  • recommended frame size: from 60 cm

 

Trekking

City & Urban Bikes


Body size: 150-160 cm 

  • recommended frame size: 42-48 cm

Body size: 160-170 cm 

  • recommended frame size: 48-52 cm

Body size: 170-180 cm 

  • recommended frame size: 52-58 cm

Body size: 180-190 cm 

  • recommended frame size: 58-63 cm

Body size: 190 cm and larger

  • recommended frame size: from 63 cm

 

Urban

Youth Bikes


Body size: 140-150 cm 

  • recommended frame size: 33-35 cm

Body size: 150-160 cm 

  • recommended frame size: 35-38 cm

Body size: 160-170 cm 

  • recommended frame size: 38-41 cm

Body size: 170-180 cm 

  • recommended frame size: 41-46 cm

Body size: 180-190 cm

  • recommended frame size: 46-53 cm

 

Jugendrad

Children's Bikes


Body size: 90-100 cm 

  • recommended wheel size: 12 inch

Body size: 100-110 cm 

  • recommended wheel size: 12-16 inch

Body size: 110-120 cm 

  • recommended wheel size: 16-18 inch

Body size: 120-130 cm 

  • recommended wheel size: 18-20 inch

Body size: 130-140 cm 

  • recommended wheel size: 20-22 inch

Body size: 140-150 cm 

  • recommended wheel size: 22-24 inch

Body size: 150-160 cm 

  • recommended wheel size: 24-26 inch

 

Kinderrad

Technical Terms for Frame Geometry

Top tube length

Measured horizontally from the middle of the head tube to the seat post, the top tube length is one of the most important sizes in determination of the sitting position. A longer top tube will lead to an athletically stretched posture, while a shorter top tube makes for a more upright or compact sitting position.

Seat tube length

The seat tube length is generally used to indicate the frame size. It is measured from the axis of the bottom bracket to the upper edge of the seat tube.

Wheel base

The distance between the rear and the front wheel hub is measured to determine the wheel base. A longer wheel base means a smoother ride, a shorter one improves manoeuvrability and agility.

Chain stay length

The length of the wheel base is directly connected to the chain stay length. The length of the chain stay is measured from the middle of the bottom bracket to the middle of the rear wheel axis.

Head tube length

Generally, the longer the head tube, the more comfortable the sitting position. Athletic riders prefer shorter head tubes for a streamlined position and better control at steep downhill rides.

Steering angle

A flat steering angle generally makes for a smoother ride and better directional stability, whereas a steep one increases agility. The angle is usually flattened with increasing spring deflection of the bike.

Seat angle

For this value, the angle of the seat tube at a ratio to the bottom bracket is determined. In many BULLS bikes, the slightly flatter seat angle and the delicate seat stays improve riding comfort.

Bottom bracket height

The bottom bracket height defines the distance of the bottom brackets from the ground. This also indicates the centre of gravity of the bike.

Reach

This size determines the horizontal distance between the middle of the bottom bracket and the upper edge of the head tube. A longer reach leads to a more extended sitting position. A smaller value means that the rider sits more upright.

Stack

In contrast to the reach, the stack means the vertical length between the bottom bracket centre and the head tube's upper edge. No matter the tyres and stem, the stack indicates the height of the front, with a higher value generally equalling a more comfortable bike.