- The wheelbase, trail and head tube angle largely determine the bike ride. A bicycle riding stable straight as the wheelbase increases, the trail becomes larger and the head tube angle is smaller . But a stable bike steers less direct. Frames for common use bikes have a less steep head tube angle than, say, road bikes.
- The wheelbase on racing bikes is generally around 100 cm. On mountain bikes and hybrids is the wheelbase around 106 cm and can be even greater in the ordinary city bike. The rear wheel is located behind the seat tube as close as possible. This causes the pressure at the rear wheel to be as large as possible. This is both favorable for the drive and for braking. With racing bikes the rear wheel is tight against the rear of the seat tube. With mountain and city bikes, the rear wheel is positioned further from the seat tube, because the chain stay has to go along the wide tire and there should be room to mount a fender. The front wheel should not be too close to the bracket, otherwise the feet may come to the front wheel. The wheelbase on a bicycle can therefore not be unlimited short. Cycling with a longer frame length have a slightly longer wheelbase. However, by placing the seating less steep and make steeper head angle, extending the wheelbase is limited.
- The head tube angle is with racing bicycles between 72 and 74 degrees. With mountain bikes and hybrids, the head tube angle between 70 and 72 degrees and regular city bikes may be that even below 70 degrees. The head tube angle is not only dependent on the application use. Large frames generally have a slightly steeper head tube angle.
- In order to ensure that the cranks during cycling are not touching the ground. The bracket should be placed high enough. On bikes which should be kicked into the corner, such as criterion bikes and bicycles used in rugged terrain with many irregularities, the bracket should be positioned slightly higher. For city bikes is particularly important that the legs can easily get to the ground.
Wheelbase Seat angle Head tube angle Common bikes.
Sportive touring bikes.
105 à 120 cm
65 à 70 º
65 à 70 º
The major size differences between city bike, mountain bike, hybrid and road bikes. The hybrid, mountain bike and road bike the variations minimal. The variations at regular bike are much larger.
- The bracket height is at most bicycles between 26 and 30 cm. With mountain bikes and criterion bikes the bracket is slightly higher, usually between 29 and 31 cm. When mounting longer cranks would actually need the bracket to go up. However, the bracket height does not increase with a larger frame size.