Mountain Bikes

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and what might be in the
future of the mountain bike.
The road bike has taken more than a hundred years to evolve into the
frame that it is being used on todays bicycle. Because of the increasingly
popularity of the mountain bike the demand for advances to be made have come
very rapidly.
The evolution of the mountain bike has been a stormy one over the past
decade. Within one decade the design has changed radically; this is due to three
reasons. First , because geometry and design were copied from the first "Stone-
Age bikes"; second, because off-road riding created different problems ; and
third, because innovative frame design mirrored the "spirit of the times": young,
new, dynamic, and strong. The off-road bike required extra stability.

Frame

It is important to know the basic frame geometry and how to measure it.
The combination of tube length and angle determines not only the maneuverability
of the bike, but also determines the seating position and the transfer of ...

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Seat-Tube Angle

This angle basically determines how the bike will handle. Today the
standard for a seat-tube is to be set at a 72° to 73° angle. At 69° to 71°, it
is a more comfortable ride, but a sharper angle increases the bike's agility and
ability to climb.

D. Headset-Tube Angle

Along with the fork and trail, the headset-tube angle determines the
steering characteristics of the bike. A steep angle together with a curved fork
reacts more sensitively when steering; a flatter angle reacts less sensitively.
In the past the angle was set at 68°, but today the standard angle of the
headset-tube is 71°.

E. Trail

The trail is the distance between two points ...

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