What happens when you switch into a higher gear on a bicycle?

Answers:

the chain moves to a larger crank setting,making it harder to peddle but you build more energy and speed.

Finally what happened to Floyd Landis?Had he doped in Tour de France last year?

Typically, this involves moving the chain to a different sized ring on the back wheel, usually a larger one. The reason is that it takes more effort to start a large ring moving than a small; so initially you want to move the RPM up on a small ring, and then shift to a higher gear with a bigger ring to get more RPM on the higher gear.

Is there a way of adjusting the bottom bracket on my dawes giro 300 bike?

Ok, smaller ring at back, or bigger ring at the front, both equate to a higher gear ratio. The higher the ratio, the further the wheel revolves for one complete turn of the pedals. On a mountain bike, low gear is typically 22Front/32Rear = 0.6875 of a wheel revolution. Highest gear is generally 44Front/11Rear = 4 wheel revolutions. Clearly, the higher the gear, the further forward you move for one complete turn of the pedals, the side effect of this is that you need greater momentum to comfortably pedal a bigger gear, which consequently requires greater effort at low pedal revolutions.
If you watch the pro's, they keep the pedal revolution speed (cadence) the same, using the gears to keep a cadence which is both comfortable and efficient (higher cadence is more efficient than low - eg, 60 rpm is harder than 80rpm, although at very high cadences, 120rpm, this becomes more difficult to maintain for any period of time). The optimum is believed to be 80-100rpm.
If you were to maintain the same cadence, the your speed will increase as you change up, until such point as you cannot maintain the cadence in a particular gear, as cadence slows, you slow and will be forced to change to a lower gear to maintain speed and reduce the effort required.

Where can i buy dura glit?

The wheel rolls farther for each pedal rotation.

What can i build with an old road frame?

you go faster

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