We manufacture superior sprockets and chainrings thanks to the excellent raw materials we use and our adherence to strict quality control. We employ the finest high-carbon steel for the sprockets and alloy steel for the chainrings. Our manufacturing facilities are fully equipped with state-of-the-art machinery, along with the best CNC computer design and computer-controlled metal cutting equipment, allowing us to produce the most precise sprockets and chainrings for your motorcycle.
Reviewing the basic anatomy of sprockets, these are rotating parts with teeth that are used in conjunction with a chain and, almost always, at least one other sprocket to transmit torque. These sprockets and the chain can be used to change the speed, torque, or original direction of an engine. For the sprockets and chain to be compatible, they must both have the same thickness and pitch. For them to function effectively, they must be on parallel axes with their corresponding teeth in the same plane.
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• The number of teeth is the total count of the number of teeth (projections) around the entire circumference of a gear. For gears or sprockets with very few teeth, it is easy to simply count the number of teeth. However, for gears or sprockets with a larger number of teeth, attempting to count the teeth may not be very practical or accurate.
• The pitch diameter (PD) is an imaginary circle traced through the center of the chain pins when the sprocket rotates while engaged with a chain. The pitch diameter ratio between sprockets can be used to calculate the gear ratio, but more commonly and much more simply, the ratio of the number of teeth is used for this calculation.
• The pitch represents the amount of pitch diameter in inches per tooth. Gears with a larger pitch will have larger teeth. Common pitches are 0.25", known as #25, and 0.375" (#35).
• The outside diameter (OD) will always be larger than the pitch diameter, but smaller than the chain clearance diameter. The outside diameter does not account for the additional diameter added by the chain, so it should not be used to check for interference of the assembly.
• Chain clearance diameter is the outside diameter of a sprocket with a chain wrapped around it. The chain clearance diameter will always be larger than the pitch diameter and the outside diameter. The chain clearance diameter should be used when looking for potential interference when sprockets or chainrings are placed very close to other structures.
We at Elpra fully understand the precision and engineering of each replacement part, and our knowledge and approach lead us to create exceptional sprockets and crowns for various motorcycle models.
Our high-grade raw materials are the primary source of our unparalleled quality. Our pinions and sprockets undergo rigorous international quality inspections at every stage of production, ensuring we maintain our superior quality. In our factories, efficient production times, prompt product delivery, and optimized manufacturing processes enable us to achieve 100% customer satisfaction and unmatched quality.
Crown and pinion manufacturing process flow
Each unit, manufactured to the highest standards, is tested against various parameters to ensure that only the best reaches the customer. Every finished pinion and crown gear is tested against the following stringent parameters, and only perfect products make it to market.
- Salt testing machine
- Profile projector for tooth profiling
- Machine for controlling the movement of the teeth on the chain.
- Surface plate with quadrant/flatness indicator test