TAILIEUCHUNG - Motorcycle Mechanics 2009 Part 4

Tham khảo tài liệu 'motorcycle mechanics 2009 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Cast Wheel Spoke Steel Rim Fig. 5-1 Cross section of wheels AMF Harley-Davidson Motor Co. Inc. tire is meant to feature the good traction of a knobby in the dirt while keeping the road maneuverability of a street tire. Although it is a good compromise it does not perform as well as either a street or dirt tire when needed. Street riders are deluged with a barrage of individual patterns of road tires. Some popular ones are shown in Fig. 5-2. Fig. 5-2 Patterns for road tire tread showing the common types Super tires like the K81 and K87 Dunlop Continental RB-H and KI 11H and Avon Speed Masters have been designed for the large displacement multi-cylinder machines and seem to work well on them. Some riders prefer rib tires on the front of their machines claiming more precise steering control. Generally however there is only a slight difference in handling so again it is more a matter of personal preference. But never install a rib tire on the rear wheel. A slight application of power on a turn in less than perfect traction will often result in a mishap. Theoretical Information I wunt ride on wunna them things Hit one little pebble on them skinny tars and down she goes No siree I want four wheels under me. You ve heard it a hundred times haven t you But did you ever wonder why you didn t go down even after striking large obstacles The answer lies in the phenomena of the gyroscopic effect of rotating tires and wheels on the balance of the machine. The inertia of revolving tires tends to keep the motorcycle upright and headed in a straight line. Spoke Patterns Spoke patterns vary according to the size of the machine and the strength required. Smaller cycles generally use 36 spokes while larger machines have 40 spokes. The spokes are attached at various tangents to the inner hub and are fixed to the rim by threaded nipples. Wheels can be made stronger by altering the spoke pattern from the simple radial array to a criss-cross pattern. The patterns in Fig. 5-3 show various

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