Same way you'd replace a chain on any other bike. I'll post a link where you can see how.
chain tool
the faster the speed of the bicycle,the brighter the lamp
Nothing special about that bike, go to www.sheldonbrown.com or www.parktool.com for explanations and maintenance instructions.
The speed ratio of a bicycle is the (gear ratio* radius of the wheel)/ Length of the pedal arm.
Braking reduces speed.
The output from the dynamo varies with the speed of the bicycle. And as a geared bicycle is likely(but don't have to) travel a bit faster than the single speed, it may produce a bit more electricity.
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The top speed for a bicycle depends on the rider (strength, stamina, coordination, muscle speed), the gearing of the bicycle, and the terrain it is being ridden over. The current record speed is 268.831 km/h - which was set on a specially designed bicycle ridden behind a dragster (to eliminate most of the air drag) on October 3, 1995 on the Bonneville Salt Flats in Utah, USA.
Walking speed Bicycle speed Automobile speed Train speed Airplane speed Rocket speed
Depends on where you are and what you are riding.BMXes usually call it a driver at the back and a sprocket at the front.Other bikes use different names.At the rear, if it's only one, it's either a single speed freewheel, or a sprocket.If it's more than one it's either a cassette or a multi-speed freewheel.At the front it's called chain wheels or chain rings.
When he's gaining speed
Put simply... it's a circle of links that connects the drive gear (attached to the pedals) to the speed gear(s) - attached to the rear wheel. Rotating the drive gear (using the pedals) transfers the movement to the gear cogs on the rear wheel - which propels the bicycle forwards.
The invention of the multi-speed bicycle increased the usefulness of the vehicle. It made it easier to pedal up hills giving it much more range.