Patents Act 1990 COMPLETE SPECIFICATION - STANDARD PATENT A Bicycle Frame with Two Bottom Brackets Brief Title (a) A Bicycle Frame with Two Bottom Brackets Name, Address, (b) I HUNTER CLIFFORD BOYCE, of 12 Guys Hill Road, Napier, Nationality New Zealand, New Zealand Citizen. HEREBY declare the invention, for which i pray that a patent may be granted to me and the method by which it is to be performed, to be particularly described in and by the following statement; Page 1 Patents Act 1990 COMPLETE SPECIFICATION - STANDARD PATENT A Bicycle Frame with Two Bottom Brackets Brief Statement (c) This invention relates to a bicycle frame suitable for everyday transportation and commuting. The problem which the It enables people to travel faster and use much less effort. invention is to solve Previously used devices Normal bicycles as sold in bicycle shops which have only one most like the invention bottom bracket and one crankset. Typical way of stating The object of the present invention is to provide a bicyle frame, the invention that can take two bottom brackets and therefore two cranksets, enabling a drive train which requires much less effort and at the same time will enable the bicycle to go much faster than a normal bicycle. Brief reference to the Fig i Shows the preferred postion of the two bottom brackets. drawings Fig 2 Shows the alternative position of the two bottom brackets. Description of the In the form shown there is a bicycle frame which has two bottom construction of the brackets labelled X and Y, This allows for two cranksets to be invention in detail mounted onto this bicycle and two sets of chainrings. The cranksets - are mounted at points X and Y and on either side of the frame. All lengths of the bicycle frame tubes as labelled A to Y may be altered in length to accommodate larger or smaller wheels to be used and also to accommodate a larger or smaller rider. All lengths of the bicycle frame may be altered also to allow smaller or larger chainrings on the cranksets. Typically only lengths F,G,H and I would be altered to achieve this, but is not limited to these two tubes only. Typically this frame would use wheels with a diameter of 20 to 30 inches, but is not limited to this size range. The bicycle frame may even have three wheels and be used as a trike. The width, length, shape, diameter, and thickness of all tubes used in the construction of the bicycle frame can be varied. Any type of material may be used in the construction of the bicycle frame, Typical materials would include Aluminium, Steel, Titanium, Carbon Fibre, but anything can be used and any combination of materials also. Tubing does not need to be round in shape. Bicycle frame building technology allows for one piece frames also, so individual tubes can be replaced by a one piece frame. Typically Aluminium or Carbon Fibre would be used for this, but is not limited to these material types. All angles of the frames tubes may be altered also. The crankset mounted on the bottom bracket labelled X would have no pedals attached to the crankarms, they would only be for the purposes of holding/mounting chainrings or similar. Pedals are attached to the crankset on Y. Page 2 Patents Act 1990 COMPLETE SPECIFICATION - STANDARD PATENT Description of the Key to Figure 1 and Figure 2 on page 5 as follows: construction of the invention in detail A = Head Tube (Continued) B = Forks C = Top Tube D - Down Tube E = Seat Tube F = Seat Stay/s G = Brace (Optional) H = Brace (Optional) I= Chainstay/s J = Vertical Tube K = Chain Stay/s X = Bottom Bracket Y = Bottom Bracket Page 3 Patents Act 1990 COMPLETE SPECIFICATION - STANDARD PATENT Description of how the In operation, two cranksets are mounted on the bottom brackets invention operates X and Y. The chainring/s fitted to the crank arms on Y will be smaller than the chainrings fitted to the crankarm/s on X Typically Y would have chainring/s with 10 to 50 teeth on them but is not limited to this range. Typically X would have chainrings with 20 to 100 teeth on them but is not limited to this range. The frame is not limited to chainrings for its effective operation and can have any means of drivetrain including belts or any other means which work just as effectively. Bicycle chains run between X and Y and between X and the back wheel of the bicycle. The back wheel will typically have a set of normal gears on it with 7 to 10 gears ranging from 10 to 50 teeth, but is not limited to these ranges. The small chainrings(or other product) on Y linked by chain, belt or any other means to X create a very low gearing which is then used to turn X which is linked to the back wheel of the bicycle. The very low gearing created by the link between X and Y allows the rider to turn the pedals/crankarms/chaintings/axle mounted on Y with very little effort. A very high gearing can be achieved between X and the back wheel and powered/turned by the rider using the very low gearing between X and Y with very little effort compared to a normal bicycle. The crankarm/s and chainring/s or other products can be mounted on either side of the frameset at X and Y and in any combination/s. The back wheel can have its gearing on either side of the wheel. Holdall clauses It will be appreciated that the invention broadly consists of two bottom brackets used to achieve a unique drivetrain system. The invention broadly consists in the parts, elements, and features described in this specification, and is deemed to include any equivalents known in the art which, if substituted for the described intergers, would not materially alter the substance of the Invention. The term "Bottom Bracket" can mean two things. One it is the shell/ area on the bicycle frame which houses the bottom bracket mechanism itself. Two it is the mechanism itself which typically comprises of bearings/axle/cups and is screwed/pressed or by other means into the bottom bracket area/shell on the frame. This invention specification refers to both but the drawings and the invention are for the first definition, the shell/area where the mechanism is housed, The frame need not look like my drawings but typically would be very similar. Tubes need not be in exactly the same places, and may have more or less tubes. My drawings are of a preffered composition only. Page 4