Applications
Construction and Features Bicycle Chains are generally categorized into two types: 1/2 3 1/8 and 1/2 3 3/32. The first number (1/2) is the chain pitch; the latter numbers (1/8 and 3/32, respectively) indicate the inner width in inches. Number 1/2 3 1/8 chain is used for simple transmission without speed shift- ing; it has the same construction as Standard Roller Chain. Number 1/2 3 3/32 chain is used with a derailleur. There are two types of construction—standard roller and bushingless (Table 1.8). In the bushingless chain, the inner link plates are extruded so that the inner plates also serve as the bushings (Figures 1.17 and 1.18). In most derailleur transmission chains, the link plates are bent or cut so that the chains can change smoothly on the front or rear sprockets.
Table 1.8 Applications of Bicycle Chains
Nominal Number 1/2 X 1/8
Inner Link
Pitch
Width
Construction Roller Chain
Application
Simple drive General purpose With derailleur
12.7
3.30
1/2 X 3/32
12.7
2.38
Roller Chain
Bushingless Chain
Sports Racing
Figure 1.17 Bushingless Bicycle Chain Components
Outer Plate Inner Plate
Pin Roller
Figure 1.18 Schematic Diagram of Bushingless Bicycle Chain
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