Features: Extended design with optimized tooth profile for improved chain engagement. Precision CNC machined from a single piece for enhanced strength and long-term durability. Positive tooth design matches standard chain width; negative tooth design compatible with narrower chains. Helps reduce vehicle weight by approximately 1kg. Constructed from high-quality aluminum alloy material for reliable performance and resistance to wear. Lightweight construction ensures minimal added weight for riding. Notice: Please allow 1-3cm variation due to manual measurement. Actual color may vary slightly from the image due to differences in monitor display and lighting conditions. Material: Aluminum Alloy Size: 32T: 136mm diameter 34T: 145mm diameter 36T: 153mm diameter 38T: 159mm diameter 40T: 169mm diameter 42T: 176mm diameter