Geared Cycle :Geared cycles use derailleur system for their operation, though common place, the system works on a very crude principle of increasing and decreasing chain tension to accomplish gear change thus decreasing gear life and making it less cost effective.
By the medium of our small gear box, we have tried to increase the speed of the cycle with the same effort of the cyclist and solve the problem of uphill climbing. Also the gear box will give more speed variations making it suitable for varied terrains and purposes.
The force resisting the motion of the bicycle Ftotal consists of the sum of rolling friction Froll, aerodynamic drag Fwind, the upward slope resistance Fslope, the bearing friction resistance and the drive efficiency h. Unlike the other quantities, upward slope resistance can also be negative - usually a positive thing for the cyclist - thus propelling rather than retarding the bicycle. Naturally the drive losses h apply only if the bicycle rider really pedals the bicycle and does not just let it roll. Bearing friction, such as friction in the hubs, is usually added to rolling friction; accordingly the bearing friction forces in the drive train are added to the drive efficiency h, specifically, pedals, bottom bracket, freewheel and partially also the hubs (the additional forces on the hub due to chain tension).
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